build.gradle app level

apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"
    defaultConfig {
        applicationId "com.sunil.recyclerviewfastscroll"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.0.0'
    testCompile 'junit:junit:4.12'

    compile 'com.android.support:recyclerview-v7:25.0.0'
    compile 'com.android.support:cardview-v7:25.0.0'
    compile 'com.android.support:design:25.0.0'

    compile 'com.jakewharton:butterknife:8.4.0'
    apt 'com.jakewharton:butterknife-compiler:8.4.0'

    compile 'com.github.bumptech.glide:glide:3.7.0'
    compile 'de.hdodenhof:circleimageview:2.0.0'
    compile 'com.simplecityapps:recyclerview-fastscroll:1.0.11'

}

ItemModel.java

public class ItemModel {

    private String name;
    private String imagePath;

    public ItemModel(){

    }

    public ItemModel(String name, String imagePath) {
        this.name = name;
        this.imagePath = imagePath;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getImagePath() {
        return imagePath;
    }

    public void setImagePath(String imagePath) {
        this.imagePath = imagePath;
    }
}

ItemModel.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {

    private final static String TAG = MainActivity.class.getSimpleName();

    private String[] names = Constant.name;
    private  String[] images = Constant.image;

    private RecyclerItemAdapter mAdapter;

    @BindView(R.id.recyclerView)
    RecyclerView recyclerView;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        initView();

    }
    private void initView() {
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        List listItems = getList();
        mAdapter = new RecyclerItemAdapter(this, listItems);
        recyclerView.setAdapter(mAdapter);
        recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));

    }

    private List getList(){
        List list = new ArrayList<>();
        for (int index =0; index < names.length; index++){
            ItemModel itemModel = new ItemModel();
            itemModel.setName(names[index]);
            itemModel.setImagePath(images[index]);
            list.add(itemModel);
        }

        if (list.size() > 0) {
            Collections.sort(list, new Comparator() {
                @Override
                public int compare(final ItemModel object1, final ItemModel object2) {
                    return object1.getName().compareTo(object2.getName());
                }
            });
        }
        return list;
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.sunil.recyclerviewfastscroll.MainActivity">

<com.simplecityapps.recyclerview_fastscroll.views.FastScrollRecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:fastScrollPopupBgColor="@color/colorAccent"
        app:fastScrollPopupTextColor="@android:color/primary_text_dark"
        app:fastScrollThumbColor="@color/colorAccent">
</com.simplecityapps.recyclerview_fastscroll.views.FastScrollRecyclerView>


<</RelativeLayout>

RecyclerItemAdapter.java

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.simplecityapps.recyclerview_fastscroll.views.FastScrollRecyclerView;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 12/3/16.
 */

public class RecyclerItemAdapter extends RecyclerView.Adapter implements FastScrollRecyclerView.SectionedAdapter {

    private List itemModels;
    private Context context;

    public RecyclerItemAdapter(Context context, List wallTalls) {
        this.itemModels = wallTalls;
        this.context = context;
    }

    @Override
    public int getItemCount() {
        return itemModels.size();
    }


    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_layout, viewGroup, false);
        return new ItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ItemModel model = itemModels.get(position);
        initializeViews(model, holder, position);
    }


    private void initializeViews(ItemModel model, final RecyclerView.ViewHolder holder, int position) {

        String imageUrl = model.getImagePath();
        if (imageUrl != null && !imageUrl.isEmpty()){
            Glide.with(context)
                    .load(imageUrl)
                    .into(((ItemViewHolder)holder).imageView);

            }
            ((ItemViewHolder)holder).name.setText(model.getName());
        }

        @NonNull
        @Override
        public String getSectionName(int position) {
            return Character.toString(itemModels.get(position).getName().charAt(0));
    }

    public static class ItemViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.name)
        TextView name;
        @BindView(R.id.imageView)
        ImageView imageView;

        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }


}

item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">

<de.hdodenhof.circleimageview.CircleImageView
        android:src="@mipmap/ic_launcher"
        android:id="@+id/imageView"
        android:layout_width="70dp"
        android:layout_height="70dp" />

<TextView
        android:id="@+id/name"
        android:text="name"
        android:textStyle="bold"
        android:layout_alignBaseline="@id/imageView"
        android:layout_margin="10dp"
        android:gravity="center_vertical"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_toRightOf="@+id/imageView"/>

</RelativeLayout>

Here is the snap shot.

Thanks for reading this post. I hope this post will help you to understand.

build.gradle app level

apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"
    defaultConfig {
        applicationId "com.sunil.stickyheaderrecyclerview"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.0.0'
    testCompile 'junit:junit:4.12'

    compile 'com.android.support:recyclerview-v7:25.0.0'
    compile 'com.android.support:cardview-v7:25.0.0'
    compile 'com.android.support:design:25.0.0'

    compile 'com.jakewharton:butterknife:8.4.0'
    apt 'com.jakewharton:butterknife-compiler:8.4.0'

    compile 'com.github.bumptech.glide:glide:3.7.0'
    compile 'de.hdodenhof:circleimageview:2.0.0'
    compile 'com.android.support:percent:25.0.0'
    compile 'com.timehop.stickyheadersrecyclerview:library:0.4.3'
}

ItemModel.java

public class ItemModel {

    private String name;
    private String imagePath;

    public ItemModel(){

    }

    public ItemModel(String name, String imagePath) {
        this.name = name;
        this.imagePath = imagePath;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getImagePath() {
        return imagePath;
    }

    public void setImagePath(String imagePath) {
        this.imagePath = imagePath;
    }
}

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import com.timehop.stickyheadersrecyclerview.StickyRecyclerHeadersDecoration;
import com.timehop.stickyheadersrecyclerview.StickyRecyclerHeadersTouchListener;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();

    private String[] names = Constant.name;
    private  String[] images = Constant.image;

    @BindView(R.id.recyclerView)
    RecyclerView recyclerView;

    RecyclerHeaderItemAdapter mAdapter ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        initView();
    }

    private void initView() {
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        List listItems = getList();
        mAdapter = new RecyclerHeaderItemAdapter(this, listItems);
        recyclerView.setAdapter(mAdapter);


        // Add the sticky headers decoration
        final StickyRecyclerHeadersDecoration headersDecor = new StickyRecyclerHeadersDecoration(mAdapter);
        recyclerView.addItemDecoration(headersDecor);

        // Add decoration for dividers between list items
        recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));

        StickyRecyclerHeadersTouchListener touchListener =
                new StickyRecyclerHeadersTouchListener(recyclerView, headersDecor);
        recyclerView.addOnItemTouchListener(touchListener);

    }

    private List getList(){
        List list = new ArrayList<>();
        for (int index =0; index < names.length; index++){
            ItemModel itemModel = new ItemModel();
            itemModel.setName(names[index]);
            itemModel.setImagePath(images[index]);
            list.add(itemModel);
        }
        if (list.size() > 0) {
            Collections.sort(list, new Comparator() {
                @Override
                public int compare(final ItemModel object1, final ItemModel object2) {
                    return object1.getName().compareTo(object2.getName());
                }
            });
        }
        return list;
    }
}

RecyclerItemAdapter.java

public abstract class RecyclerItemAdapter extends RecyclerView.Adapter {

    List items = new ArrayList<>();
    RecyclerItemAdapter(){
        setHasStableIds(true);
    }


    public void add(ItemModel object) {
        items.add(object);
        notifyDataSetChanged();
    }

    public void add(int index, ItemModel object) {
        items.add(index, object);
        notifyDataSetChanged();
    }

    public void addAll(Collection collection) {
        if (collection != null) {
            items.addAll(collection);
            notifyDataSetChanged();
        }
    }

    public void addAll(ItemModel... items) {
        addAll(Arrays.asList(items));
    }

    public void clear() {
        items.clear();
        notifyDataSetChanged();
    }

    public void remove(ItemModel object) {
        items.remove(object);
        notifyDataSetChanged();
    }

}

RecyclerHeaderItemAdapter.java

public class RecyclerHeaderItemAdapter extends RecyclerItemAdapter implements StickyRecyclerHeadersAdapter {

    private List mList ;
    private Context context;

    RecyclerHeaderItemAdapter(Context context, List list ){
        this.mList = list;
        this.context = context;
    }


    @Override
    public long getHeaderId(int position) {
        if (position == 0) {
            return -1;
        } else {
            return getItemId(position);
        }
    }

    @Override
    public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_header, parent, false);
        return new ItemHeaderViewHolder(view);
    }

    @Override
    public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof ItemHeaderViewHolder) {
            if (getItem(position).getName() != null) {
                String header = String.valueOf(getItem(position).getName().charAt(0));
                ((ItemHeaderViewHolder) holder).header.setText(header);
            }
        }

    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
        return new ItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ItemModel itemModel = mList.get(position);
        ((ItemViewHolder)holder).name.setText(itemModel.getName());
        String imageUrl = itemModel.getImagePath();
        if (imageUrl != null){
            Glide.with(context)
                    .load(imageUrl)
                    .into(((ItemViewHolder)holder).imageView);
        }
    }

    @Override
    public int getItemCount() {
        return mList.size();
    }

    public ItemModel getItem(int position) {
        return mList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return getItem(position).hashCode();
    }


    public static class ItemViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.name)
        TextView name;

        @BindView(R.id.imageView)
        ImageView imageView;

        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }

    public static class ItemHeaderViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.header)
        TextView header;

        public ItemHeaderViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.sunil.stickyheaderrecyclerview.MainActivity">

<android.support.v7.widget.RecyclerView
       android:id="@+id/recyclerView"
       android:layout_width="match_parent"
       android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">

<de.hdodenhof.circleimageview.CircleImageView
        android:src="@mipmap/ic_launcher"
        android:id="@+id/imageView"
        android:layout_width="70dp"
        android:layout_height="70dp" />

<TextView
        android:id="@+id/name"
        android:text="name"
        android:textStyle="bold"
        android:layout_alignBaseline="@id/imageView"
        android:layout_margin="10dp"
        android:gravity="center_vertical"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_toRightOf="@+id/imageView"/>

</RelativeLayout>

build.gradle app level

apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.1"
    defaultConfig {
        applicationId "com.sunil.collapsetoolbarrecyclerview"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.0.0'
    testCompile 'junit:junit:4.12'

    compile 'com.android.support:recyclerview-v7:25.0.0'
    compile 'com.android.support:cardview-v7:25.0.0'
    compile 'com.android.support:design:25.0.0'

    compile 'com.jakewharton:butterknife:8.4.0'
    apt 'com.jakewharton:butterknife-compiler:8.4.0'

    compile 'com.github.bumptech.glide:glide:3.7.0'
    compile 'de.hdodenhof:circleimageview:2.0.0'
}

ItemModel.java

public class ItemModel {

    private String name;
    private String imagePath;

    public ItemModel(){

    }

    public ItemModel(String name, String imagePath) {
        this.name = name;
        this.imagePath = imagePath;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getImagePath() {
        return imagePath;
    }

    public void setImagePath(String imagePath) {
        this.imagePath = imagePath;
    }
}

CollapsingToolBarActivity.java

import android.os.Bundle;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ImageView;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 12/8/16.
 */

public class CollapsingToolBarActivity extends AppCompatActivity {

    @BindView(R.id.my_recycler_view)
    RecyclerView mRecyclerView;
    @BindView(R.id.header)
    ImageView header;
    @BindView(R.id.toolbar_flexible_space)
    Toolbar toolbarFlexibleSpace;
    @BindView(R.id.collapsing_toolbar)
    CollapsingToolbarLayout collapsingToolbar;

    String imageUrl[] = Constant.image;
    String names[] = Constant.name;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_collapsing);
        ButterKnife.bind(this);

        initView();
    }

    private void initView() {

        toolbarFlexibleSpace.setTitle("Collapse Tool Bar");
        setSupportActionBar(toolbarFlexibleSpace);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        toolbarFlexibleSpace.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                CollapsingToolBarActivity.super.onBackPressed();
            }
        });


        List list = getList();
        RecyclerAdapter adapter = new RecyclerAdapter(this, list);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setAdapter(adapter);
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this,LinearLayoutManager.VERTICAL));
    }

    private List getList() {
        List list = new ArrayList<>();
        for (int i = 0; i < imageUrl.length; i++) {
            ItemModel model = new ItemModel();
            model.setName(names[i]);
            model.setImagePath(imageUrl[i]);
            list.add(model);
        }
        return list;
    }
}

activity_collapsing.xml

<android.support.design.widget.CoordinatorLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<android.support.v7.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/appbar"
        android:padding="10dp"
        android:scrollbars="vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:layout_height="325dp">

<android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:contentScrim="?colorPrimary"
            app:expandedTitleMarginStart="48dp"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
                android:id="@+id/header"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@drawable/background"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax" />


<android.support.v7.widget.Toolbar
                android:id="@+id/toolbar_flexible_space"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin">

</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>

QuickReturnToolBarActivity.java

import android.os.Bundle;
import android.support.design.widget.AppBarLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.View;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 12/8/16.
 */

public class QuickReturnToolBarActivity extends AppCompatActivity {

    @BindView(R.id.toolbar)
    Toolbar toolbar;
    @BindView(R.id.appbar)
    AppBarLayout appbar;
    @BindView(R.id.my_recycler_view)
    RecyclerView mRecyclerView;

    String imageUrl[] = Constant.image;
    String names[] = Constant.name;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activitt_quick_retrun);
        ButterKnife.bind(this);

        initView();
    }

    private void initView() {

        toolbar.setTitle("Quick Return Tool Bar");
        setSupportActionBar(toolbar);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                QuickReturnToolBarActivity.super.onBackPressed();
            }
        });


        List list = getList();
        RecyclerAdapter adapter = new RecyclerAdapter(this, list);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setAdapter(adapter);
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
    }

    private List getList() {
        List list = new ArrayList<>();
        for (int i = 0; i < imageUrl.length; i++) {
            ItemModel model = new ItemModel();
            model.setName(names[i]);
            model.setImagePath(imageUrl[i]);
            list.add(model);
        }
        return list;
    }
}

activitt_quick_retrun.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:titleTextColor="#fff"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_scrollFlags="scroll|enterAlways" />
</android.support.design.widget.AppBarLayout>

<android.support.v7.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</android.support.design.widget.CoordinatorLayout>

build.gradle app level

    compile 'com.android.support:recyclerview-v7:25.0.0'
    compile 'com.android.support:cardview-v7:25.0.0'
    compile 'com.android.support:design:25.0.0'
    compile 'com.jakewharton:butterknife:8.4.0'
    apt 'com.jakewharton:butterknife-compiler:8.4.0'
    compile 'com.github.bumptech.glide:glide:3.7.0'
    compile 'de.hdodenhof:circleimageview:2.0.0'

ItemModel.java

    public class ItemModel {

    private String name;
    private String imagePath;

    public ItemModel(){

    }

    public ItemModel(String name, String imagePath) {
        this.name = name;
        this.imagePath = imagePath;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getImagePath() {
        return imagePath;
    }

    public void setImagePath(String imagePath) {
        this.imagePath = imagePath;
    }
}

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {


    String imageUrl[] = Constant.image;
    String names[] = Constant.name;

    @BindView(R.id.my_recycler_view)
    RecyclerView mRecyclerView;
    private RecyclerAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        initView();
    }

    private void initView() {

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);

        List list = getList();
        mAdapter = new RecyclerAdapter(this, list);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setAdapter(mAdapter);
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
    }

    private List getList() {
        List list = new ArrayList<>();
        for (int i = 0; i < imageUrl.length; i++) {
            ItemModel model = new ItemModel();
            model.setName(names[i]);
            model.setImagePath(imageUrl[i]);
            list.add(model);
        }
        return list;
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.switch_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id) {
            case android.R.id.home:
                finish();
                break;
            case R.id.switch_view:
                supportInvalidateOptionsMenu();
                boolean isSwitched = mAdapter.toggleItemViewType();
                mRecyclerView.setLayoutManager(isSwitched ? new LinearLayoutManager(this) : new GridLayoutManager(this, 2));
                mAdapter.notifyDataSetChanged();
                break;
        }

        return super.onOptionsItemSelected(item);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.sunil.switchlisttogridrecyclerview.MainActivity">


<android.support.v7.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scrollbars="vertical"/>

</RelativeLayout>

RecyclerAdapter.java

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 12/10/16.
 */

public class RecyclerAdapter extends RecyclerView.Adapter {

    private List itemModels;
    private Context context;
    private static final int LIST_ITEM = 0;
    private static final int GRID_ITEM = 1;
    boolean isSwitchView = true;

    public RecyclerAdapter(Context context, List itemModels) {
        this.itemModels = itemModels;
        this.context = context;
    }

    @Override
    public int getItemCount() {
        return itemModels.size();
    }


    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

        View itemView;
        if (i == LIST_ITEM){
             itemView = LayoutInflater.from(viewGroup.getContext()).inflate( R.layout.item_layout, null);
        }else{
             itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_view_grid, null);
        }
        return new ItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ItemModel model = itemModels.get(position);
        initializeViews(model, holder, position);
    }

    @Override
    public int getItemViewType (int position) {
        if (isSwitchView){
            return LIST_ITEM;
        }else{
            return GRID_ITEM;
        }
    }

    public boolean toggleItemViewType () {
        isSwitchView = !isSwitchView;
        return isSwitchView;
    }



    private void initializeViews(ItemModel model, final RecyclerView.ViewHolder holder, int position) {

        String imageUrl = model.getImagePath();
        if (imageUrl != null && !imageUrl.isEmpty()){
            Glide.with(context)
                    .load(imageUrl)
                    .into(((ItemViewHolder)holder).imageView);

        }
        ((ItemViewHolder)holder).name.setText(model.getName());
    }

    public static class ItemViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.name)
        TextView name;
        @BindView(R.id.imageView)
        ImageView imageView;

        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }
}

item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp">

<de.hdodenhof.circleimageview.CircleImageView
        android:src="@mipmap/ic_launcher"
        android:id="@+id/imageView"
        android:layout_width="70dp"
        android:layout_height="70dp" />

<TextView
        android:id="@+id/name"
        android:text="name"
        android:textStyle="bold"
        android:layout_alignBaseline="@id/imageView"
        android:layout_margin="10dp"
        android:gravity="center_vertical"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_toRightOf="@+id/imageView"/>
</RelativeLayout>

item_layout_grid.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="0dp">

<RelativeLayout
        android:padding="10dp"
        android:layout_centerHorizontal="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal">

<de.hdodenhof.circleimageview.CircleImageView
            android:src="@mipmap/ic_launcher"
            android:id="@+id/imageView"
            android:layout_width="70dp"
            android:layout_height="70dp" />

<TextView
            android:id="@+id/name"
            android:text="name"
            android:textStyle="bold"
            android:layout_margin="10dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/imageView"/>

</RelativeLayout>
</RelativeLayout>

build.gradle project level

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.2'
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
        classpath "io.realm:realm-gradle-plugin:2.2.1"
         // this is the realm plugin you need to add this dependency in project level as I added
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

build.gradle app level

apply plugin: 'realm-android'
// Add this plugin on top of your plugin listed.

MainApplication.java

import android.app.Application;

import io.realm.Realm;
import io.realm.RealmConfiguration;

/**
 * Created by sunil on 12/14/16.
 */

public class MainApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        // Initialize Realm. Should only be done once when the application starts.
        Realm.init(this);
    }
} 

Note.java

 public class Note extends RealmObject {

    private long id;
    private String tittle;
    private String comment;
    private String noteDate;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getTittle() {
        return tittle;
    }

    public void setTittle(String tittle) {
        this.tittle = tittle;
    }

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    public String getNoteDate() {
        return noteDate;
    }

    public void setNoteDate(String noteDate) {
        this.noteDate = noteDate;
    }
 }

NoteManager.java

import java.util.ArrayList;
import java.util.List;

import io.realm.Realm;
import io.realm.RealmQuery;
import io.realm.RealmResults;

/**
 * Created by sunil on 12/14/16.
 */

public class NoteManager {

    public static void addNote(Realm realm, Note noteData){
        realm.beginTransaction();
        Note note = realm.createObject(Note.class);
        note.setId(getCount(realm)+1);
        note.setTittle(noteData.getTittle());
        note.setComment(noteData.getComment());
        note.setNoteDate(noteData.getNoteDate());
        realm.commitTransaction();
    }

    public static List getAllNotes(Realm realm){
        List noteList = new ArrayList<>();
        RealmQuery query = realm.where(Note.class);
        RealmResults results = query.findAll();
        for (int index =0; index < results.size(); index++){
            Note note = results.get(index);
            noteList.add(note);
        }
        return noteList;

    }

    public static Note getNoteByID( Realm realm , long id){
        Note note = realm.where(Note.class).equalTo("id", id).findFirst();
        return note;
    }

    private static long getCount(Realm realm){
        long count = realm.where(Note.class).count();
        return count;
    }

    public static void updateNote(Realm realm, Note noteData){

       Note note = realm.where(Note.class).equalTo("id", noteData.getId()).findFirst();
        realm.beginTransaction();
        note.setTittle(noteData.getTittle());
        note.setComment(noteData.getComment());
        note.setNoteDate(noteData.getNoteDate());
        realm.commitTransaction();
    }


    public static void deleteNote(Realm realm, final Long id){
        realm.executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                RealmResults result = realm.where(Note.class).equalTo("id", id).findAll();
                result.deleteAllFromRealm();
            }
        });
    }
}

MainActivity.java

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import io.realm.Realm;

public class MainActivity extends AppCompatActivity implements NoteAdapter.OnInteractionDelete{

    @BindView(R.id.no_data)
    TextView noData;
    @BindView(R.id.recyclerView)
    RecyclerView recyclerView;
    @BindView(R.id.button_create)
    Button buttonCreate;
    @BindView(R.id.activity_main)
    RelativeLayout activityMain;

    Realm realm;
    NoteAdapter adapter;

    private List list ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        realm = Realm.getDefaultInstance();

        recyclerView.setLayoutManager(new LinearLayoutManager(this));
    }


    @Override
    protected void onResume() {
        super.onResume();
        list = new ArrayList<>();
        list = NoteManager.getAllNotes(realm);
        if (list == null && list.size() == 0) {
            noData.setVisibility(View.VISIBLE);
            recyclerView.setVisibility(View.GONE);
        } else {
            noData.setVisibility(View.GONE);
            recyclerView.setVisibility(View.VISIBLE);
            adapter = new NoteAdapter(this, list, this);
            recyclerView.setAdapter(adapter);

        }
    }

    @OnClick(R.id.button_create)
    public void createNoteClick() {
        Intent intent = new Intent(MainActivity.this, NoteDetailActivity.class);
        intent.putExtra("Create", true);
        startActivity(intent);
    }

    @Override
    public void onDeleteClick(final int position) {
        Note note = list.get(position);
        Long id = note.getId();
        NoteManager.deleteNote(realm, id);
        list.remove(note);
        adapter.notifyItemRemoved(position);
        adapter.notifyItemRangeChanged(position, adapter.getItemCount());
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.sunil.realmandroidapp.MainActivity">

<TextView
        android:id="@+id/no_data"
        android:text="@string/no_note"
        android:layout_centerInParent="true"
        android:gravity="center"
        android:visibility="gone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

<android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_marginBottom="20dp"
        android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>

<Button
        android:id="@+id/button_create"
        android:layout_alignParentBottom="true"
        android:background="@color/colorPrimary"
        android:layout_width="match_parent"
        android:text="@string/Create_Note"
        android:textColor="#ffff"
        android:layout_height="wrap_content" />
</RelativeLayout>

NoteDetailActivity.java

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.TextInputLayout;
import android.support.v7.app.AppCompatActivity;
import android.widget.Button;
import android.widget.EditText;

import java.util.Calendar;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import io.realm.Realm;

/**
 * Created by sunil on 12/14/16.
 */

public class NoteDetailActivity extends AppCompatActivity {

    @BindView(R.id.title)
    EditText title;
    @BindView(R.id.titleLayout)
    TextInputLayout titleLayout;
    @BindView(R.id.description)
    EditText description;
    @BindView(R.id.descriptionLayout)
    TextInputLayout descriptionLayout;
    @BindView(R.id.age)
    EditText dateEditText;
    @BindView(R.id.dateLayout)
    TextInputLayout dateLayout;
    @BindView(R.id.save)
    Button save;

    Realm realm;

    private boolean isCreate;
    private Long noteId;
    private Note mNote;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_note_detail);
        ButterKnife.bind(this);

        realm = Realm.getDefaultInstance();

        Bundle bundle = getIntent().getExtras();
        if (bundle != null) {
            isCreate = bundle.getBoolean("Create");
            noteId = bundle.getLong("NoteID");
        }
        if (!isCreate) {
            save.setText("Save");
            mNote = NoteManager.getNoteByID(realm, noteId);
            if (mNote != null) {
                title.setText(mNote.getTittle());
                description.setText(mNote.getComment());
                dateEditText.setText(mNote.getNoteDate() + "");
            }
        } else {
            save.setText("Add");
            Calendar c = Calendar.getInstance();
            System.out.println("Current time => " + c.getTime());
            dateEditText.setText(c.getTime()+"");
        }
    }

    @OnClick(R.id.save)
    public void saveClick(){
        if (isCreate){
            // insert note
            if (!valid()){
                return;
            }else{
                Note note = new Note();
                note.setTittle(title.getText().toString());
                note.setComment(description.getText().toString());
                note.setNoteDate(dateEditText.getText().toString());
                NoteManager.addNote(realm, note);
                finish();
            }

        }else{
            // update note
            if (!valid()){
                return;
            }else{
                mNote.setTittle(title.getText().toString());
                mNote.setComment(description.getText().toString());
                mNote.setNoteDate(dateEditText.getText().toString());
                NoteManager.updateNote(realm, mNote);
                finish();
            }
        }
    }

    private boolean valid(){
        boolean isValid;
        if (Utility.nullCheck(titleLayout, "Title")){
            isValid = false;
        }
        else if (Utility.nullCheck(descriptionLayout, "Comment")){
            isValid = false;
        }
        else if (Utility.nullCheck(dateLayout, "Date")){
            isValid = false;
        }else{
            isValid = true;
        }
        return  isValid;
    }
}

activity_note_detail.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="8dp">

<android.support.design.widget.TextInputLayout
        android:id="@+id/titleLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp">

<EditText
            android:id="@+id/title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Title"/>
</android.support.design.widget.TextInputLayout>

<android.support.design.widget.TextInputLayout
        android:id="@+id/descriptionLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/titleLayout"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp">

<EditText
            android:id="@+id/description"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Comment"/>
</android.support.design.widget.TextInputLayout>

<android.support.design.widget.TextInputLayout
        android:id="@+id/dateLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/descriptionLayout"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp">

<EditText
            android:id="@+id/age"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Date"/>
</android.support.design.widget.TextInputLayout>

<Button
        android:id="@+id/save"
        android:text="@string/add"
        android:background="@color/colorPrimary"
        android:textColor="#fff"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</RelativeLayout>

NoteAdapter.java

import android.app.Activity;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 12/14/16.
 */

public class NoteAdapter extends RecyclerView.Adapter {

    private List noteList;
    private Context context;
    OnInteractionDelete mListener;

    public NoteAdapter(Context context, List notes, Activity activity) {
        this.noteList = notes;
        this.context = context;
        this.mListener = (OnInteractionDelete) activity;
    }

    @Override
    public int getItemCount() {
        return noteList.size();
    }

    @Override
    public void onBindViewHolder(NoteViewHolder noteViewHolder, final int i) {
        Note note = noteList.get(i);
        noteViewHolder.title.setText(note.getTittle());
        noteViewHolder.description.setText(note.getComment());
        noteViewHolder.date.setText(note.getNoteDate()+"");
        noteViewHolder.delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mListener.onDeleteClick(i);
            }
        });
    }

    @Override
    public NoteViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item_note, viewGroup, false);
        return new NoteViewHolder(itemView);
    }

    public static class NoteViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.title)
        TextView title;
        @BindView(R.id.description)
        TextView description;
        @BindView(R.id.date)
        TextView date;
        @BindView(R.id.delete)
        ImageView delete;


        public NoteViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }

    public interface OnInteractionDelete{
        void onDeleteClick(int position);
    }
}

list_item_note.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="8dp">

<android.support.v7.widget.CardView
        android:id="@+id/cardView"
        app:cardUseCompatPadding="true"
        app:cardCornerRadius="0dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<RelativeLayout
            android:id="@+id/main_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="5dp">

<TextView
                android:id="@+id/title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textStyle="bold"
                android:textSize="16sp"
                android:layout_marginBottom="3dp"
                android:text="@string/title"/>

<ImageView
                android:id="@+id/delete"
                android:src="@drawable/ic_delete_black_24dp"
                android:layout_alignParentRight="true"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

<TextView
                android:id="@+id/description"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/delete"
                android:textSize="13sp"
                android:text="@string/comment"/>

<TextView
                android:id="@+id/date"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/delete"
                android:textSize="13sp"
                android:gravity="right"
                android:text="@string/date"/>

</RelativeLayout>


</android.support.v7.widget.CardView>

</RelativeLayout>

build.gradle app level

  compile 'com.android.support:recyclerview-v7:25.0.0'
    compile 'com.android.support:cardview-v7:25.0.0'
    compile 'com.android.support:design:25.0.0'
    compile 'com.jakewharton:butterknife:8.4.0'
    apt 'com.jakewharton:butterknife-compiler:8.4.0'

ItemModel.java

public class ItemModel {

    private int id;
    private String name;
    private boolean isSelected;


    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public boolean isSelected() {
        return isSelected;
    }

    public void setSelected(boolean selected) {
        isSelected = selected;
    }
}

MainActivity.java

 public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
    }

    @OnClick(R.id.single_selection)
    public void singleSelectionClicked(){

        Intent intent = new Intent(MainActivity.this, RecyclerViewActivity.class);
        intent.putExtra("TAG", "single");
        startActivity(intent);
    }

    @OnClick(R.id.max_selection)
    public void maxSelectionClicked(){
        Intent intent = new Intent(MainActivity.this, RecyclerViewActivity.class);
        intent.putExtra("TAG", "max");
        startActivity(intent);
    }

    @OnClick(R.id.multi_selection)
    public void multiSelectionClicked(){
        Intent intent = new Intent(MainActivity.this, RecyclerViewActivity.class);
        intent.putExtra("TAG", "multiple");
        startActivity(intent);
    }
}

RecyclerViewActivity.java

  import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.Toast;

import com.sunil.multiselectionrecyclerview.adapters.MultiMaxSelectionAdapter;
import com.sunil.multiselectionrecyclerview.adapters.MultiSelectionAdapter;
import com.sunil.multiselectionrecyclerview.adapters.SingleSelectionAdapter;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

/**
 * Created by sunil on 12/17/16.
 */

public class RecyclerViewActivity extends AppCompatActivity {

    @BindView(R.id.recyclerView)
    RecyclerView mRecyclerView;
    @BindView(R.id.selected)
    Button selected;

    private String tag;
    String names[] = Constant.name;

    SingleSelectionAdapter adapterSingle;
    MultiMaxSelectionAdapter adapterMultiMax;
    MultiSelectionAdapter adapterMulti;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recyclerview);
        ButterKnife.bind(this);

        initView();
    }

    private void initView() {

        Bundle bundle = getIntent().getExtras();
        if (bundle != null) {
            tag = bundle.getString("TAG");
        }

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);

        List list = getList();
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        if (tag.equalsIgnoreCase("Single")) {
            adapterSingle = new SingleSelectionAdapter(this, list);
            mRecyclerView.setAdapter(adapterSingle);
        } else if (tag.equalsIgnoreCase("max")) {
            adapterMultiMax = new MultiMaxSelectionAdapter(this, list);
            mRecyclerView.setAdapter(adapterMultiMax);
        } else if (tag.equalsIgnoreCase("multiple")) {
            adapterMulti = new MultiSelectionAdapter(this, list);
            mRecyclerView.setAdapter(adapterMulti);
        }
    }

    private List getList() {
        List list = new ArrayList<>();
        for (int i = 0; i < names.length; i++) {
            ItemModel model = new ItemModel();
            model.setName(names[i]);
            model.setId(i);
            list.add(model);
        }
        return list;
    }

    @OnClick(R.id.selected)
    public void selectedClick() {
        if (tag.equalsIgnoreCase("Single")) {
            if (adapterSingle.selectedPosition() != -1) {
                ItemModel itemModel = adapterSingle.getSelectedItem();
                String cityName = itemModel.getName();
                showToast("Selected City is: " + cityName);
            } else {
                showToast("Please select any city");
            }
        }else if (tag.equalsIgnoreCase("max")){
            List list = adapterMultiMax.getSelectedItem();
            if (list.size() > 0){
                StringBuilder sb = new StringBuilder();
                for (int index = 0; index < list.size(); index++){
                    ItemModel model = list.get(index);
                    sb.append(model.getName()+"\n");
                }
                showToast(sb.toString());
            }else{
                showToast("Please select any city");
            }
        }
        else if (tag.equalsIgnoreCase("multiple")){
            List list = adapterMulti.getSelectedItem();
            if (list.size() > 0){
                StringBuilder sb = new StringBuilder();
                for (int index = 0; index < list.size(); index++){
                    ItemModel model = list.get(index);
                    sb.append(model.getName()+"\n");
                }
                showToast(sb.toString());
            }else{
                showToast("Please select any city");
            }
        }
    }

    private void showToast(String message){
        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                finish();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

activity_recyclerview.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_marginBottom="50dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>

<Button
        android:id="@+id/selected"
        android:text="Selected Items"
        android:textColor="#fff"
        android:background="@color/colorPrimary"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</RelativeLayout>

SingleSelectionAdapter.java

  import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RadioButton;
import android.widget.TextView;

import com.sunil.multiselectionrecyclerview.ItemModel;
import com.sunil.multiselectionrecyclerview.R;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 12/17/16.
 */

public class SingleSelectionAdapter extends RecyclerView.Adapter {

    private List itemModels;
    private Context context;
    private int lastCheckedPosition = -1;

    public SingleSelectionAdapter(Context context, List itemModels) {
        this.itemModels = itemModels;
        this.context = context;
    }

    @Override
    public int getItemCount() {
        return itemModels.size();
    }


    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item_single, viewGroup, false);
        return new ItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ItemModel model = itemModels.get(position);
        initializeViews(model, holder, position);
    }


    private void initializeViews(final ItemModel model, final RecyclerView.ViewHolder holder, int position) {
        ((ItemViewHolder)holder).name.setText(model.getName());
        if (model.getId() == lastCheckedPosition){
            ((ItemViewHolder)holder).radioButton.setChecked(true);
        }else{
            ((ItemViewHolder)holder).radioButton.setChecked(false);
        }
        ((ItemViewHolder)holder).radioButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                lastCheckedPosition = model.getId();
                notifyItemRangeChanged(0, itemModels.size());

            }
        });
    }

    public ItemModel getSelectedItem(){
        ItemModel model = itemModels.get(lastCheckedPosition);
        return model;
    }
    public int selectedPosition(){
       return lastCheckedPosition;
    }

    public static class ItemViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.name)
        TextView name;
        @BindView(R.id.radio)
        RadioButton radioButton;

        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);

        }
    }
}

list_item_single.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_margin="5dp"
    android:layout_height="wrap_content">

<android.support.v7.widget.CardView
        android:id="@+id/cardView"
        app:cardCornerRadius="0dp"
        app:cardUseCompatPadding="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<RelativeLayout
            android:padding="15dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

<TextView
                android:padding="5dp"
                android:id="@+id/name"
                android:text="Name"
                android:textSize="16sp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

<RadioButton
                android:padding="5dp"
                android:id="@+id/radio"
                android:layout_alignBaseline="@+id/name"
                android:layout_alignParentRight="true"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

</RelativeLayout>

</android.support.v7.widget.CardView>

</LinearLayout>

MultiMaxSelectionAdapter.java

  import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;

import com.sunil.multiselectionrecyclerview.ItemModel;
import com.sunil.multiselectionrecyclerview.R;

import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 12/17/16.
 */

public class MultiMaxSelectionAdapter extends RecyclerView.Adapter {

    private List itemModels;
    private Context context;
    int numberOfCheckboxesChecked = 0;

    public MultiMaxSelectionAdapter(Context context, List itemModels) {
        this.itemModels = itemModels;
        this.context = context;
    }

    @Override
    public int getItemCount() {
        return itemModels.size();
    }


    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item_multi, viewGroup, false);
        return new ItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ItemModel model = itemModels.get(position);
        initializeViews(model, holder, position);
    }


    private void initializeViews(final ItemModel model, final RecyclerView.ViewHolder holder, int position) {
        ((ItemViewHolder)holder).name.setText(model.getName());
        ((ItemViewHolder)holder).checkBox.setChecked(model.isSelected());
        ((ItemViewHolder)holder).checkBox.setTag(new Integer(position));
        ((ItemViewHolder)holder).checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                CheckBox cb = (CheckBox)view;
                int clickedPos = ((Integer)cb.getTag()).intValue();
                if (cb.isChecked() && numberOfCheckboxesChecked >= 3){
                    cb.setChecked(false);
                    Toast.makeText(context, "Max allowed three checkbox only", Toast.LENGTH_LONG).show();
                }else {
                    if (cb.isChecked()) {
                        numberOfCheckboxesChecked++;
                    } else {
                        numberOfCheckboxesChecked--;
                    }
                    itemModels.get(clickedPos).setSelected(cb.isChecked());
                    notifyDataSetChanged();
                }
            }
        });
    }

    public  List getSelectedItem(){
        List itemModelList = new ArrayList<>();
        for (int i =0; i < itemModels.size(); i++){
           ItemModel itemModel = itemModels.get(i);
            if (itemModel.isSelected()){
                itemModelList.add(itemModel);
            }
        }
        return itemModelList;
    }

    public static class ItemViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.name)
        TextView name;
        @BindView(R.id.checkbox)
        CheckBox checkBox;

        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);

        }
    }
}

list_item_multi.gradle

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_margin="5dp"
    android:layout_height="wrap_content">

<android.support.v7.widget.CardView
        android:id="@+id/cardView"
        app:cardCornerRadius="0dp"
        app:cardUseCompatPadding="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<RelativeLayout
            android:padding="15dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

<TextView
                android:padding="5dp"
                android:id="@+id/name"
                android:text="Name"
                android:textSize="16sp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

<CheckBox
                android:padding="5dp"
                android:id="@+id/checkbox"
                android:layout_alignBaseline="@+id/name"
                android:layout_alignParentRight="true"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

</RelativeLayout>

</android.support.v7.widget.CardView>

</LinearLayout>

MultiSelectionAdapter.java

  public class MultiSelectionAdapter extends RecyclerView.Adapter {

    private List itemModels;
    private Context context;

    public MultiSelectionAdapter(Context context, List itemModels) {
        this.itemModels = itemModels;
        this.context = context;
    }

    @Override
    public int getItemCount() {
        return itemModels.size();
    }


    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item_multi, viewGroup, false);
        return new ItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ItemModel model = itemModels.get(position);
        initializeViews(model, holder, position);
    }


    private void initializeViews(final ItemModel model, final RecyclerView.ViewHolder holder, int position) {
        ((ItemViewHolder)holder).name.setText(model.getName());
        ((ItemViewHolder)holder).checkBox.setChecked(model.isSelected());
        ((ItemViewHolder)holder).checkBox.setTag(new Integer(position));
        ((ItemViewHolder)holder).checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                CheckBox cb = (CheckBox)view;
                int clickedPos = ((Integer)cb.getTag()).intValue();
                itemModels.get(clickedPos).setSelected(cb.isChecked());
                notifyDataSetChanged();
            }
        });
    }

    public  List getSelectedItem(){
        List itemModelList = new ArrayList<>();
        for (int i =0; i < itemModels.size(); i++){
            ItemModel itemModel = itemModels.get(i);
            if (itemModel.isSelected()){
                itemModelList.add(itemModel);
            }
        }
        return itemModelList;
    }

    public static class ItemViewHolder extends RecyclerView.ViewHolder {

        @BindView(R.id.name)
        TextView name;
        @BindView(R.id.checkbox)
        CheckBox checkBox;

        public ItemViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);

        }
    }
}

Thanks for reading this post. I hope it will helps you.

build.gradle app level

      compile 'com.google.android.gms:play-services-maps:9.8.0'
      compile 'com.google.android.gms:play-services-location:9.8.0'
      compile "com.jakewharton:butterknife:8.1.0"
      apt 'com.jakewharton:butterknife-compiler:8.0.1'

GoogleMapLocationActivity.java

mport android.Manifest;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.location.Location;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;


import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 12/31/16.
 */

public class GoogleMapLocationActivity extends AppCompatActivity implements
        OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener, LocationListener {

    MapFragment mapFragment;

    private GoogleApiClient mGoogleApiClient;
    private GoogleMap mGoogleMap;
    private boolean mRequestingLocationUpdates = false;
    private LatLng mLatLng;
    private PolylineOptions mPolylineOptions;
    private Marker mCurrLocationMarker;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_googlemap_location);
        ButterKnife.bind(this);

        mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
        setsupActionBar();


    }


    @Override
    public void onPause() {
        super.onPause();
        //stop location updates when Activity is no longer active
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }


    private void setsupActionBar() {
        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayShowHomeEnabled(true);
        getSupportActionBar().setHomeAsUpIndicator(getResources().getDrawable(R.drawable.navigate_back));
    }

    private synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        LocationRequest mLocationRequest = createLocationRequest();
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
            initializePolyline();
        }
    }


    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }


    private LocationRequest createLocationRequest() {
        LocationRequest mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(10000);
        mLocationRequest.setFastestInterval(5000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        return mLocationRequest;
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mGoogleMap = googleMap;
        //Initialize Google Play Services
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                //Location Permission already granted
                buildGoogleApiClient();
                mGoogleMap.setMyLocationEnabled(true);
            } else {
                //Request Location Permission
                checkLocationPermission();
            }
        }
        else {
            buildGoogleApiClient();
            mGoogleMap.setMyLocationEnabled(true);
        }


    }

    @Override
    public void onLocationChanged(Location location) {
        mLatLng = new LatLng(location.getLatitude(), location.getLongitude());
        updateCamera();
        addMarker(mLatLng);
    }

    private void updateCamera() {
        mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mLatLng, 16));
        updatePolyline();
    }

    private void initializePolyline() {
        mGoogleMap.clear();
        mPolylineOptions = new PolylineOptions();
        mPolylineOptions.color(Color.BLUE).width(10);
        mGoogleMap.addPolyline(mPolylineOptions);

    }

    private void updatePolyline() {
        mPolylineOptions.add(mLatLng);
        mGoogleMap.clear();
        mGoogleMap.addPolyline(mPolylineOptions);
    }
    private void addMarker(LatLng latLng){
        if (mCurrLocationMarker != null) {
            mCurrLocationMarker.remove();
        }
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("Current Position");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);

    }


    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle presses on the action bar items
        switch (item.getItemId()) {
            case R.id.share_locations:

                Intent i = new Intent(android.content.Intent.ACTION_SEND);
                String location = mLatLng.latitude + "," + mLatLng.longitude;
                i.setType("text/plain");
                i.putExtra(Intent.EXTRA_SUBJECT, "Current Location");
                i.putExtra(Intent.EXTRA_TEXT, " http://maps.google.com/maps?q=loc:" + location);

                try {
                    startActivity(Intent.createChooser(i, "Share Location"));
                } catch (android.content.ActivityNotFoundException ex) {
                    Toast.makeText(this, "Not found any app", Toast.LENGTH_LONG).show();
                }

                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
    private void checkLocationPermission() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)) {

                // Show an explanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.
                new AlertDialog.Builder(this)
                        .setTitle("Location Permission Needed")
                        .setMessage("This app needs the Location permission, please accept to use location functionality")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                //Prompt the user once explanation has been shown
                                ActivityCompat.requestPermissions(GoogleMapLocationActivity.this,
                                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                                        MY_PERMISSIONS_REQUEST_LOCATION );
                            }
                        })
                        .create()
                        .show();


            } else {
                // No explanation needed, we can request the permission.
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                        MY_PERMISSIONS_REQUEST_LOCATION );
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_LOCATION: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // location-related task you need to do.
                    if (ContextCompat.checkSelfPermission(this,
                            Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {

                        if (mGoogleApiClient == null) {
                            buildGoogleApiClient();
                        }
                        mGoogleMap.setMyLocationEnabled(true);
                    }

                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
                }
                return;
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }
}

activity_googlemap_location.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

<fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:name="com.google.android.gms.maps.MapFragment"/>

</LinearLayout>

MainActivity.java

import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Point;
import android.graphics.pdf.PdfDocument;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private TextView mTextView;
    private Button btnCreatePdf;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = (TextView)findViewById(R.id.textview);
        btnCreatePdf = (Button)findViewById(R.id.create_pdf);
        mTextView.setText(getString(R.string.dummy_text_content));
        btnCreatePdf.setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {
        if (view.getId() == R.id.create_pdf){

            if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                if (ContextCompat.checkSelfPermission(this,
                        Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
                    // Permission already granted
                    createPdfFle();
                } else {
                    //Request Location Permission
                    checkWritePermission();
                }
            }
            else {
                createPdfFle();
            }

        }
    }

    private void createPdfFle(){
        new Thread() {
            public void run() {
                // Get the directory for the app's private pictures directory.
                final File file = new File(Environment.getExternalStorageDirectory(), "PdfTest.pdf");

                if (file.exists ()) {
                    file.delete ();
                }

                FileOutputStream out = null;
                try {
                    out = new FileOutputStream(file);

                    PdfDocument document = new PdfDocument();
                    Point windowSize = new Point();
                    getWindowManager().getDefaultDisplay().getSize(windowSize);
                    PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(windowSize.x, windowSize.y, 1).create();
                    PdfDocument.Page page = document.startPage(pageInfo);
                    View content = getWindow().getDecorView();
                    content.draw(page.getCanvas());
                    document.finishPage(page);
                    document.writeTo(out);
                    document.close();
                    out.flush();

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(MainActivity.this, "File created: "+file.getAbsolutePath(), Toast.LENGTH_LONG).show();
                        }
                    });
                } catch (Exception e) {
                    Log.d("TAG_PDF", "File was not created: "+e.getMessage());
                } finally {
                    try {
                        out.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }

    public static final int MY_PERMISSIONS_REQUEST_WRITE = 99;
    private void checkWritePermission() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE)) {

                // Show an explanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.
                new AlertDialog.Builder(this)
                        .setTitle("Write Storage Permission Needed")
                        .setMessage("This app needs the Write Storage permission, please accept to use to write functionality")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                //Prompt the user once explanation has been shown
                                ActivityCompat.requestPermissions(MainActivity.this,
                                        new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                                        MY_PERMISSIONS_REQUEST_WRITE );
                            }
                        })
                        .create()
                        .show();


            } else {
                // No explanation needed, we can request the permission.
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                        MY_PERMISSIONS_REQUEST_WRITE );
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_WRITE: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // location-related task you need to do.
                    if (ContextCompat.checkSelfPermission(this,
                            Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
                        createPdfFle();
                    }

                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
                }
                return;
            }
        }
    }

    private void sharePdfFile(){
        String emailAddress[] = {getString(R.string.email)}; // email: test@gmail.com

        Uri uri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "PdfTest.pdf"));
        Intent emailIntent = new Intent(Intent.ACTION_SEND);
        emailIntent.putExtra(Intent.EXTRA_EMAIL, emailAddress);
        emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Share Pdf");
        emailIntent.putExtra(Intent.EXTRA_TEXT, "Hi, Please get pdf");
        emailIntent.setType("application/pdf");
        emailIntent.putExtra(Intent.EXTRA_STREAM, uri);

        startActivity(Intent.createChooser(emailIntent, "Send email using:"));
    }

    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle presses on the action bar items
        switch (item.getItemId()) {
            case R.id.share_pdf:
                sharePdfFile();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:fillViewport="true"
    android:layout_height="match_parent">
<RelativeLayout
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.sunil.pdf.createpdfandroidapp.MainActivity">

<TextView
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_marginBottom="50dp"
        android:layout_height="match_parent"
        android:text="Hello World!" />

<RelativeLayout
        android:id="@+id/button_container"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<Button
            android:id="@+id/create_pdf"
            android:text="Create PDF"
            android:textColor="#fff"
            android:background="@color/colorPrimary"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

</RelativeLayout>
</RelativeLayout>
</ScrollView>

splash_background.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

<item android:drawable="@color/colorPrimary" />

<item>
<bitmap android:src="@drawable/ic_stars_red_500_48dp"
            android:gravity="center" />

</item>

</layer-list>

style.xml

<style name="Splash" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="android:windowBackground">@drawable/splash_background</item>
</style>

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

import org.adw.library.widgets.discreteseekbar.DiscreteSeekBar;

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.title_normal)
    TextView titleNormal;
    @BindView(R.id.discrete_normal)
    DiscreteSeekBar discreteNormal;
    @BindView(R.id.title_multiple)
    TextView titleMultiple;
    @BindView(R.id.discrete_multiple)
    DiscreteSeekBar discreteMultiple;
    @BindView(R.id.title_range_multiple)
    TextView titleRangeMultiple;
    @BindView(R.id.discrete_multiple_range)
    DiscreteSeekBar discreteMultipleRange;
    @BindView(R.id.title_interval_range_multiple)
    TextView titleIntervalRangeMultiple;
    @BindView(R.id.discrete_interval_multiple_range)
    DiscreteSeekBar discreteIntervalMultipleRange;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        initSeekBar(); // normal seek bar bar 0 to 100
        initMultipleOfSeekBar();   // multiple of 100 form 0 to 10000
        initMultipleRangeOfSeekBar();  // multiple of 100 form 500 to 10000
        initIntervalMultipleRangeOfSeekBar();   // multiple of 100 form 500 to 1000 and after multiple of 1000 from 1000 to 10000

    }

    private void initIntervalMultipleRangeOfSeekBar() {
        discreteIntervalMultipleRange.setMin(0);
        discreteIntervalMultipleRange.setMax(14);
        discreteIntervalMultipleRange.setNumericTransformer(new DiscreteSeekBar.NumericTransformer() {
            @Override
            public int transform(int value) {
                if (value <= 5) {
                    return (value * 100) + 500;
                }else {
                    return (value - 4) * 1000;
                }
            }
        });

        discreteIntervalMultipleRange.setOnProgressChangeListener(new DiscreteSeekBar.OnProgressChangeListener() {
            @Override
            public void onProgressChanged(DiscreteSeekBar seekBar, int value, boolean fromUser) {
                if (fromUser) {
                    int updatedValue = 0;
                    if (value <= 5) {
                         updatedValue = (value * 100) + 500;
                    }else{
                         updatedValue = (value - 4) * 1000;
                    }
                    titleIntervalRangeMultiple.setText("Interval Multiple Range SeekBar- Value: " + updatedValue);
                }
            }

            @Override
            public void onStartTrackingTouch(DiscreteSeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(DiscreteSeekBar seekBar) {

            }
        });
    }

    private void initMultipleRangeOfSeekBar() {

        discreteMultipleRange.setMin(0);
        discreteMultipleRange.setMax(95);
        discreteMultipleRange.setNumericTransformer(new DiscreteSeekBar.NumericTransformer() {
            @Override
            public int transform(int value) {
                return (value * 100) + 500;
            }
        });

        discreteMultipleRange.setOnProgressChangeListener(new DiscreteSeekBar.OnProgressChangeListener() {
            @Override
            public void onProgressChanged(DiscreteSeekBar seekBar, int value, boolean fromUser) {
                if (fromUser) {
                    int updatedValue = (value * 100) + 500;
                    titleRangeMultiple.setText("Multiple Range SeekBar- Value: " + updatedValue);
                }
            }

            @Override
            public void onStartTrackingTouch(DiscreteSeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(DiscreteSeekBar seekBar) {

            }
        });
    }

    private void initMultipleOfSeekBar() {
        discreteMultiple.setMin(0);
        discreteMultiple.setMax(100);  //result should be in multiple of 100
        discreteMultiple.setNumericTransformer(new DiscreteSeekBar.NumericTransformer() {
            @Override
            public int transform(int value) {
                return value * 100;
            }
        });

        discreteMultiple.setOnProgressChangeListener(new DiscreteSeekBar.OnProgressChangeListener() {
            @Override
            public void onProgressChanged(DiscreteSeekBar seekBar, int value, boolean fromUser) {
                titleMultiple.setText("Multiple SeekBar- Value: " + value * 100);
            }

            @Override
            public void onStartTrackingTouch(DiscreteSeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(DiscreteSeekBar seekBar) {

            }
        });
    }

    private void initSeekBar() {
        discreteNormal.setOnProgressChangeListener(new DiscreteSeekBar.OnProgressChangeListener() {
            @Override
            public void onProgressChanged(DiscreteSeekBar seekBar, int value, boolean fromUser) {
                titleNormal.setText("Normal SeekBar- Value: " + value);
            }

            @Override
            public void onStartTrackingTouch(DiscreteSeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(DiscreteSeekBar seekBar) {

            }
        });
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.sunil.customseekbarandroid.MainActivity">

<RelativeLayout
        android:id="@+id/relative_normal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<TextView
            android:text="Normal SeekBar"
            android:id="@+id/title_normal"
            android:gravity="center"
            android:textSize="15sp"
            android:layout_marginBottom="20dp"
            android:textColor="@color/colorPrimary"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

<org.adw.library.widgets.discreteseekbar.DiscreteSeekBar
            android:layout_below="@+id/title_normal"
            android:id="@+id/discrete_normal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:dsb_min="0"
            app:dsb_max="100"
            app:dsb_value="0"
            />

<RelativeLayout
            android:layout_below="@+id/discrete_normal"
            android:layout_marginBottom="20dp"
            android:layout_width="match_parent"
            android:padding="5dp"
            android:layout_height="wrap_content">

<TextView
                android:text="Min:1"
                android:gravity="left"
                android:textSize="12sp"
                android:layout_marginLeft="10dp"
                android:textColor="@color/colorPrimary"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

<TextView
                android:text="Max:100"
                android:gravity="right"
                android:textSize="12sp"
                android:layout_marginRight="10dp"
                android:textColor="@color/colorPrimary"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />


</RelativeLayout>

</RelativeLayout>

<RelativeLayout
        android:id="@+id/multiple_seekbar"
        android:layout_below="@+id/relative_normal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<TextView
            android:text="Multiple of SeekBar"
            android:id="@+id/title_multiple"
            android:gravity="center"
            android:textSize="15sp"
            android:layout_marginBottom="20dp"
            android:textColor="@color/colorPrimary"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

<org.adw.library.widgets.discreteseekbar.DiscreteSeekBar
            android:layout_below="@+id/title_multiple"
            android:id="@+id/discrete_multiple"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:dsb_min="0"
            app:dsb_max="100"
            app:dsb_value="0"
            />

<RelativeLayout
            android:layout_below="@+id/discrete_multiple"
            android:layout_marginBottom="20dp"
            android:layout_width="match_parent"
            android:padding="5dp"
            android:layout_height="wrap_content">

<TextView
                android:text="Min:0"
                android:gravity="left"
                android:textSize="12sp"
                android:layout_marginLeft="10dp"
                android:textColor="@color/colorPrimary"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

<TextView
                android:text="Max:10000"
                android:gravity="right"
                android:textSize="12sp"
                android:layout_marginRight="10dp"
                android:textColor="@color/colorPrimary"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />


</RelativeLayout>

</RelativeLayout>

<RelativeLayout
        android:id="@+id/multiple_range_seekbar"
        android:layout_below="@+id/multiple_seekbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<TextView
            android:text="Multiple Range of SeekBar"
            android:id="@+id/title_range_multiple"
            android:gravity="center"
            android:textSize="15sp"
            android:layout_marginBottom="20dp"
            android:textColor="@color/colorPrimary"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

<org.adw.library.widgets.discreteseekbar.DiscreteSeekBar
            android:layout_below="@+id/title_range_multiple"
            android:id="@+id/discrete_multiple_range"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:dsb_min="0"
            app:dsb_max="100"
            app:dsb_value="0"
            />

<RelativeLayout
            android:layout_below="@+id/discrete_multiple_range"
            android:layout_marginBottom="20dp"
            android:layout_width="match_parent"
            android:padding="5dp"
            android:layout_height="wrap_content">

<TextView
                android:text="Min:500"
                android:gravity="left"
                android:textSize="12sp"
                android:layout_marginLeft="10dp"
                android:textColor="@color/colorPrimary"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

<TextView
                android:text="Max:10000"
                android:gravity="right"
                android:textSize="12sp"
                android:layout_marginRight="10dp"
                android:textColor="@color/colorPrimary"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />


</RelativeLayout>

</RelativeLayout>

<RelativeLayout
        android:id="@+id/interval_multiple_range_seekbar"
        android:layout_below="@+id/multiple_range_seekbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

<TextView
            android:text="Interval Multiple Range of SeekBar"
            android:id="@+id/title_interval_range_multiple"
            android:gravity="center"
            android:textSize="15sp"
            android:layout_marginBottom="20dp"
            android:textColor="@color/colorPrimary"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

<org.adw.library.widgets.discreteseekbar.DiscreteSeekBar
            android:layout_below="@+id/title_interval_range_multiple"
            android:id="@+id/discrete_interval_multiple_range"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:dsb_min="0"
            app:dsb_max="100"
            app:dsb_value="0"
            />

<RelativeLayout
            android:layout_below="@+id/discrete_interval_multiple_range"
            android:layout_marginBottom="20dp"
            android:layout_width="match_parent"
            android:padding="5dp"
            android:layout_height="wrap_content">

<TextView
                android:text="Min:500"
                android:gravity="left"
                android:textSize="12sp"
                android:layout_marginLeft="10dp"
                android:textColor="@color/colorPrimary"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

<TextView
                android:text="Max:10000"
                android:gravity="right"
                android:textSize="12sp"
                android:layout_marginRight="10dp"
                android:textColor="@color/colorPrimary"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />


</RelativeLayout>

</RelativeLayout>

</RelativeLayout>

SlidePanelActivity.java

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.widget.SlidingPaneLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.view.View;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 28-01-2017.
 */

public class SlidePanelActivity extends AppCompatActivity {

    @BindView(R.id.recyclerView)
    RecyclerView recyclerView;
    @BindView(R.id.SlidingPanel)
    SlidingPaneLayout SlidingPanel;
    @BindView(R.id.tool_bar)
    Toolbar toolBar;

    private ActionBar actionBar;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_slidepanel_right);
        ButterKnife.bind(this);

        setSupportActionBar(toolBar);
        actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeAsUpIndicator(R.drawable.ic_menu);


        List list = Constant.getList();
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
        RecyclerAdapter adapter = new RecyclerAdapter(this, list);
        recyclerView.setAdapter(adapter);

        SlidingPanel.setPanelSlideListener(new SlidingPaneLayout.PanelSlideListener() {
            @Override
            public void onPanelSlide(View panel, float slideOffset) {

            }

            @Override
            public void onPanelOpened(View panel) {
                actionBar.setHomeAsUpIndicator(R.drawable.ic_arrow_back_white_24dp);
            }

            @Override
            public void onPanelClosed(View panel) {
                actionBar.setHomeAsUpIndicator(R.drawable.ic_menu);
            }
        });
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch (item.getItemId()) {
            case android.R.id.home:
                if (SlidingPanel.isOpen()) {
                    actionBar.setHomeAsUpIndicator(R.drawable.ic_arrow_back_white_24dp);
                    SlidingPanel.closePane();
                    actionBar.setTitle(getString(R.string.app_name));
                } else {
                    actionBar.setHomeAsUpIndicator(R.drawable.ic_menu);
                    SlidingPanel.openPane();
                    actionBar.setTitle("Menu Titles");
                }
                break;
            default:
                break;
        }
        return super.onOptionsItemSelected(item);
    }

}

activity_slide_panel.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
<include
        android:id="@+id/tool_bar"
        layout="@layout/toolbar_layout">
</include>
<include
        android:id="@+id/SlidingPanel"
        layout="@layout/slidepanel_layout">
</include>

</LinearLayout>

slidepanel_laout.xml

<android.support.v4.widget.SlidingPaneLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/SlidingPanel"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<LinearLayout
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="right">

<android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>

</LinearLayout>

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="right"
        android:background="#101010"
        android:orientation="vertical">

<TextView
            android:text="Slide Panel"
            android:textColor="#fff"
            android:gravity="center"
            android:background="@color/colorAccent"
            android:textSize="20dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
</LinearLayout>

</android.support.v4.widget.SlidingPaneLayout>

SlideDrawerActivity.java

import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Gravity;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by sunil on 04-02-2017.
 */

public class SlideDrawerActivity extends AppCompatActivity {


    @BindView(R.id.menu)
    ImageView menu;
    @BindView(R.id.content_frame)
    RelativeLayout contentFrame;
    @BindView(R.id.left_drawer)
    RelativeLayout leftDrawer;
    @BindView(R.id.drawer_layout)
    DrawerLayout drawerLayout;
    @BindView(R.id.recyclerView)
    RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_slide);
        ButterKnife.bind(this);

        List list = Constant.getList();
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
        RecyclerAdapter adapter = new RecyclerAdapter(this, list);
        recyclerView.setAdapter(adapter);

        menu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                drawerLayout.openDrawer(Gravity.LEFT);
            }
        });

        drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
                contentFrame.setX(slideOffset * 380);
            }

            @Override
            public void onDrawerOpened(View drawerView) {

            }

            @Override
            public void onDrawerClosed(View drawerView) {

            }

            @Override
            public void onDrawerStateChanged(int newState) {

            }
        });
    }
}

activity_slide.xml

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fff">

<RelativeLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorAccent">

<ImageView
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:id="@+id/menu"
            android:layout_alignParentTop="true"
            android:layout_alignParentLeft="true"
            android:layout_marginTop="10dp"
            android:layout_marginLeft="10dp"
            android:src="@drawable/ic_menu"
            />
<TextView
            android:text="Slide Drawer"
            android:textColor="#fff"
            android:gravity="center"
            android:textSize="20dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
</RelativeLayout>


<RelativeLayout
        android:id="@+id/left_drawer"
        android:layout_width="200dp"
        android:background="#fff"
        android:layout_height="match_parent"
        android:layout_gravity="start">

<RelativeLayout
            android:gravity="center"
            android:id="@+id/header_container"
            android:layout_width="match_parent"
            android:layout_height="150dp">

<TextView
                android:text="UserName"
                android:gravity="center"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

</RelativeLayout>

<android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_below="@+id/header_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>

</RelativeLayout>
</android.support.v4.widget.DrawerLayout>

CardObserver.java

package com.sunil.rxjavaexample;

import java.util.Objects;

/**
 * Created by sunil on 11-02-2017.
 */

public abstract class CardObserver {

    protected PermanentAddressObservable permanentAddressObservable;
    public abstract void update();
}

PermanentAddressObservable.java

package com.sunil.rxjavaexample;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by sunil on 11-02-2017.
 */

public class PermanentAddressObservable {

    private List observers = new ArrayList();
    private String address;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
        notifyAllObservers();
    }

    public void attach(CardObserver observer){
        observers.add(observer);
    }

    public void notifyAllObservers(){
        for (CardObserver observer : observers) {
            observer.update();
        }
    }
}

AuthorityCardAddressObserver.java

package com.sunil.rxjavaexample;

/**
 * Created by sunil on 11-02-2017.
 */

public class AuthorityCardAddressObserver extends CardObserver {

    public AuthorityCardAddressObserver(PermanentAddressObservable permanentAddressObservable){
        this.permanentAddressObservable = permanentAddressObservable;
        this.permanentAddressObservable.attach(this);
    }

    @Override
    public void update() {
        System.out.println( "Address Change: "+permanentAddressObservable.getAddress());
    }
}

MainActivity.java

package com.sunil.rxjavaexample;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        PermanentAddressObservable permanentAddressObservable = new PermanentAddressObservable();
        new AuthorityCardAddressObserver(permanentAddressObservable);
        System.out.println("Initiated Address Change");
        permanentAddressObservable.setAddress("This is my new Address");
    }
}

AndroidPointTutorial.java

package com.sunil.rxjavaexample.tutorial;

import java.util.Observable;

/**
 * Created by sunil on 11-02-2017.
 */

public class AndroidPointTutorial extends Observable{

    private String article;

    public AndroidPointTutorial(String value) {
        article = value;
    }

    public String getArticle() {
        return article;
    }

    public void setArticle(String newArticle) {
        if (!article.equals(newArticle)) {
            System.out.println("Article changed to new article: " + article);
            article = newArticle;
            setChanged();
            notifyObservers(article);
        }
    }
}    

Developers.java

package com.sunil.rxjavaexample.tutorial;

import java.util.Observable;
import java.util.Observer;

/**
 * Created by sunil on 11-02-2017.
 */

public class Developers implements Observer{

    private AndroidPointTutorial androidPointTutorial = null;

    public Developers(AndroidPointTutorial androidPointTutorial) {
        this.androidPointTutorial = androidPointTutorial;
    }
    public void update(Observable observable, Object o) {
        System.out.println("Updated :"+androidPointTutorial.getArticle());
    }

}    

MainActivity.java

package com.sunil.rxjavaexample;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.sunil.rxjavaexample.tutorial.AndroidPointTutorial;
import com.sunil.rxjavaexample.tutorial.Developers;

import java.util.Observable;
import java.util.Observer;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        AndroidPointTutorial androidPointTutorial = new AndroidPointTutorial("Original Article");
        Developers developers = new Developers(androidPointTutorial);
        androidPointTutorial.addObserver(developers);

        androidPointTutorial.setArticle("New Article");  // this will get update and notify to developer
    }

}

Observable observable = Observable.just("Hello World");
observable.subscribe(observer);

 Observer observer = new Observer() {
        @Override
        public void onSubscribe(Disposable d) {

        }

        @Override
        public void onNext(Object value) {
            Toast.makeText(MainActivity.this, (String)value, Toast.LENGTH_LONG).show();
        }

        @Override
        public void onError(Throwable e) {
            Toast.makeText(MainActivity.this, "Error "+e, Toast.LENGTH_LONG).show();
        }

        @Override
        public void onComplete() {
            Toast.makeText(MainActivity.this, "Completed", Toast.LENGTH_LONG).show();
        }
    };

package com.sunil.rxjavaexample.utils;

/**
 * Created by sunil on 18-02-2017.
 */

public interface DialogListener {

    void onPositiveButtonClick();
    void onNegativeButtonClick();
}

package com.sunil.rxjavaexample.utils;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;

/**
 * Created by sunil on 18-02-2017.
 */

public class DialogUtil {

    public static void showDialog(Context context, String title, String message, final DialogListener dialogListener){
        new AlertDialog.Builder(context)
                .setTitle(title)
                .setMessage(message)
                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialogListener.onPositiveButtonClick();
                    }
                })
                .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialogListener.onNegativeButtonClick();
                    }
                })
                .setIcon(android.R.drawable.ic_dialog_alert)
                .show();
    }
}

final DialogListener dialogListener = new DialogListener() {
            @Override
            public void onPositiveButtonClick() {
                Toast.makeText(MainActivity.this, "Positive Clicked", Toast.LENGTH_LONG).show();
            }

            @Override
            public void onNegativeButtonClick() {
                Toast.makeText(MainActivity.this, "Negative Clicked", Toast.LENGTH_LONG).show();
            }
        };

        Button button = (Button)findViewById(R.id.alertButton);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogUtil.showDialog(MainActivity.this, "Rx Alert", "Are you love this Rx?", dialogListener);


            }
        });

  public static void showDialogRx(final Context context, final String title, final String message, final Observer observer) {

         Observable.create(new ObservableOnSubscribe() {
             @Override
             public void subscribe(final ObservableEmitter e) throws Exception {
                 final AlertDialog ad = new AlertDialog.Builder(context)
                         .setTitle(title)
                         .setMessage(message)
                         .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                             public void onClick(DialogInterface dialog, int which) {
                                 e.onNext(true);
                                 e.onComplete();
                             }
                         })
                         .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                             public void onClick(DialogInterface dialog, int which) {
                                 e.onNext(false);
                                 e.onComplete();
                             }
                         })
                         .create();
                 ad.show();
             }
         }).subscribe(observer);
    }

 button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogUtil.showDialogRx(MainActivity.this, "Rx Alert", "Are you love this Rx?", observer);

            }
        });

    Observer observer = new Observer() {
        @Override
        public void onSubscribe(Disposable d) {

        }

        @Override
        public void onNext(Object value) {
            Toast.makeText(MainActivity.this, value.toString(), Toast.LENGTH_LONG).show();
        }

        @Override
        public void onError(Throwable e) {
            Toast.makeText(MainActivity.this, "Error "+e, Toast.LENGTH_LONG).show();
        }

        @Override
        public void onComplete() {
            Toast.makeText(MainActivity.this, "Completed", Toast.LENGTH_LONG).show();
        }
    };

     Webservice.getNetworkCall()
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Observer() {
                @Override
                public void onSubscribe(Disposable d) {

                }

                @Override
                public void onNext(String value) {
                   // handle your request or you can merge any thing
                }

                @Override
                public void onError(Throwable e) {

                }

                @Override
                public void onComplete() {

                }
            });

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.annotation.Nullable;

/**
 * Created by sunil on 25-02-2017.
 */

public class TestService extends Service {

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        doSomeTask(startId); // Here you do some task
        return super.onStartCommand(intent, flags, startId);

    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    private void doSomeTask(int startId) {

        stopSelf(startId); // stop service if your task completed
    }
}

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        doSomeTask(startId); // Here you do some task
        return START_STICKY;   // you can set the flag as per your requirement.

    }

import android.app.IntentService;
import android.content.Intent;

/**
 * Created by sunil on 25-02-2017.
 */

public class TestIntentService extends IntentService {

    public TestIntentService(String s){
        super(s);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
         doSomeTask(); // do your task
    }

    private void doSomeTask() {

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }
}

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.support.annotation.Nullable;

/**
 * Created by sunil on 2/25/2017.
 */

public class MyService extends Service{

    private final IBinder mBinder = new LocalService();

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    public class LocalService extends Binder{

        MyService getService(){
            return MyService.this;
        }
    }

    public String getFirstMessage(){
        return "Hi, I am sunil";
    }

    public String getSecondMessage(){
        return "Good to see you.";
    }
}

import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
/**
 * Created by sunil on 2/25/2017.
 */

public class BindServiceActivity extends AppCompatActivity {

    MyService myService;
    private boolean isBind;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bind_service);

        ((Button) findViewById(R.id.btn_start)).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getServiceMessage();
            }
        });
    }


    private void getServiceMessage() {
        // call the localService methods Here
        String firstMessage = myService.getFirstMessage();
        String secondMessage = myService.getSecondMessage();
        Toast.makeText(BindServiceActivity.this, firstMessage + "" + secondMessage, Toast.LENGTH_LONG).show();
    }

    // Here need to create the service connection
    ServiceConnection serviceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // get the locala service instance
            MyService.LocalService localService = (MyService.LocalService) service;
            myService = localService.getService();
            isBind = true;


        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            isBind = false;
        }
    };


    @Override
    protected void onSart() {
        super.onStart();
         Intent intent = new Intent(this, MyService.class);
         bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (isBind) {
            unbindService(serviceConnection);
        }
    }
}

import android.app.Service;
import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.support.annotation.Nullable;
import android.widget.Toast;

/**
 * Created by sunil on 2/26/2017.
 */

public class MyServiceIPC extends Service {

    public static final int JOB_1 = 1;
    public static final int JOB_RESPONSE_1 = 2;

    Messenger messenger = new Messenger(new IncomingHandler());

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return messenger.getBinder();
    }

    class IncomingHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {

            Message message;
            Bundle bundle = new Bundle();
            String messageText;

            switch (msg.what) {
                case JOB_1:
                    messageText = msg.getData().getString("message");
                    message = Message.obtain(null, JOB_RESPONSE_1);
                    Toast.makeText(getApplicationContext(),messageText , Toast.LENGTH_SHORT).show();
                    bundle.putString("message_res", messageText.toUpperCase());
                    message.setData(bundle);
                    Messenger activityMessenger = msg.replyTo;
                    try {
                        activityMessenger.send(message);
                    } catch (RemoteException e) {
                        e.printStackTrace();
                    }
                    break;
                default:
                    super.handleMessage(msg);
            }

        }
    }
}

import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.example.testapp.R;

/**
 * Created by sunil on 2/26/2017.
 */

public class BindServiceIPCActivity extends AppCompatActivity {

    private Button btnSend;
    private EditText editText;
    private Messenger messenger;
    private boolean isBound;
    private final Messenger mActivityMessenger = new Messenger(
            new ResponseTakeHandler(this));


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bind_ipc);

        editText = (EditText)findViewById(R.id.messageEditText);
        btnSend = (Button)findViewById(R.id.sendButton);
        btnSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String messageText = editText.getText().toString();
                if (messageText.isEmpty()){
                    Toast.makeText(BindServiceIPCActivity.this, "Please enter message", Toast.LENGTH_LONG).show();
                }else{
                    Message message = Message.obtain(null,MyServiceIPC.JOB_1);
                    Bundle bundle = new Bundle();
                    bundle.putString("message", messageText);
                    message.setData(bundle);
                    message.replyTo = mActivityMessenger;
                    try {
                        messenger.send(message);
                    } catch (RemoteException e) {
                        e.printStackTrace();
                    }
                }

            }
        });

    }

    @Override
    protected void onStart() {
        super.onStart();
        if (!isBound) {
            // start service here
            Intent intent = new Intent(BindServiceIPCActivity.this, MyServiceIPC.class);
            bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        isBound = false;
        messenger = null;
    }

    ServiceConnection serviceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            messenger = new Messenger(service);
            isBound = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            isBound = false;
            messenger = null;

        }
    };


    public class ResponseTakeHandler extends Handler{

        public ResponseTakeHandler(Context context){

        }
        @Override
        public void handleMessage(Message msg) {

            switch (msg.what){
                case MyServiceIPC.JOB_RESPONSE_1:
                    String result = msg.getData().getString("message_res");
                    Toast.makeText(BindServiceIPCActivity.this, "Response: "+result, Toast.LENGTH_LONG).show();
                    break;
                default:
                    super.handleMessage(msg);
            }

        }
    }

}

<service android:name=".bindservice.ipc.MyServiceIPC" android:process=":remote"/>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp">

<EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter message here"
        android:id="@+id/messageEditText"/>

<Button
        android:layout_marginTop="10dp"
        android:id="@+id/sendButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        android:textColor="#fff"
        android:text="Send IPC Message"/>

</LinearLayout>

Article.java

import android.content.ContentValues;
import android.database.Cursor;

/**
 * Created by sunil on 3/11/2017.
 */

public class Article {

    public static final String TABLE_NAME = "Article";

    // Naming the id column with an underscore is good to be consistent
    // with other Android things. This is ALWAYS needed
    public static final String ARTICLE_ID = "_id";
    // These fields can be anything you want.
    public static final String TITLE = "title";
    public static final String DESCRIPTION = "description";
    public static final String AUTHOR_NAME = "author";

    public long id = -1;
    public String title = "";
    public String description = "";
    public String author = "";

    public Article(){

    }

    public static final String CREATE_TABLE =
"CREATE TABLE " + TABLE_NAME + "("
                    + ARTICLE_ID + " INTEGER PRIMARY KEY,"
                    + TITLE + " TEXT NOT NULL DEFAULT '',"
                    + DESCRIPTION + " TEXT NOT NULL DEFAULT '',"
                    + AUTHOR_NAME + " TEXT NOT NULL DEFAULT ''"
                    + ")";

    public Article(final Cursor cursor) {
        // Indices expected to match order in FIELDS!
        this.id = cursor.getLong(0);
        this.title = cursor.getString(1);
        this.description = cursor.getString(2);
        this.author = cursor.getString(3);
    }


    public ContentValues getContent(Article article) {
        final ContentValues values = new ContentValues();
        // Note that ID is NOT included here
        values.put(TITLE, article.getTitle());
        values.put(DESCRIPTION, article.getDescription());
        values.put(AUTHOR_NAME, article.getAuthor());
        return values;
    }

    public static final String[] FIELDS = { ARTICLE_ID, TITLE, DESCRIPTION, AUTHOR_NAME };

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }
}

DatabaseHelper.java

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by sunil on 03/11/2017.
 */

public class DatabaseHelper extends SQLiteOpenHelper{

    private static final int DATABASE_VERSION = 1;
    private static final String DATABASE_NAME = "AndroidPoint";
    private final Context context;

    private static DatabaseHelper databaseHandlerInstance;

    public static DatabaseHelper getInstance(final Context context) {
        if (databaseHandlerInstance == null) {
            databaseHandlerInstance = new DatabaseHelper(context);
        }
        return databaseHandlerInstance;
    }

    public DatabaseHelper(Context context){
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        this.context = context.getApplicationContext();
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(Article.CREATE_TABLE);

        Article article = new Article();
        article.setTitle("Service in android part1");;
        article.setDescription("Service is important component");
        article.setAuthor("sunil");
        db.insert(Article.TABLE_NAME, null, article.getContent(article));

        Article article1 = new Article();
        article1.setTitle("Service in android part2");
        article1.setDescription("Service is running in background.");
        article1.setAuthor("sunil");
        db.insert(Article.TABLE_NAME, null, article.getContent(article1));
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }

    public synchronized Article getArticle(final long id) {
        final SQLiteDatabase db = this.getReadableDatabase();
        final Cursor cursor = db.query(Article.TABLE_NAME, Article.FIELDS,
                Article.ARTICLE_ID + " IS ?", new String[] { String.valueOf(id) },
                null, null, null, null);
        if (cursor == null || cursor.isAfterLast()) {
            return null;
        }

        Article item = null;
        if (cursor.moveToFirst()) {
            item = new Article(cursor);
        }
        cursor.close();
        return item;
    }

    public synchronized List getAllArticle() {
        List articleList = new ArrayList<>();
        final SQLiteDatabase db = this.getReadableDatabase();
        final Cursor cursor = db.query(Article.TABLE_NAME, Article.FIELDS,
               null, null, null, null, null, null);
        try {
            while (cursor.moveToNext()) {
                 Article article = new Article();
                article.setTitle(cursor.getString(1));
                article.setDescription(cursor.getString(2));
                article.setAuthor( cursor.getString(3));
                articleList.add(article);
            }
        } finally {
            cursor.close();
        }
        return articleList;
    }

    public synchronized boolean addArticle(final Article article) {
        boolean success = false;
        int result = 0;
        final SQLiteDatabase db = this.getWritableDatabase();

        if (article.id > -1) {
            result += db.update(Article.TABLE_NAME, article.getContent(article),
                    Article.ARTICLE_ID + " IS ?",
                    new String[] { String.valueOf(article.id) });
        }

        if (result > 0) {
            success = true;
        } else {
            // Update failed or wasn't possible, insert instead
            final long id = db.insert(Article.TABLE_NAME, null,
                    article.getContent(article));

            if (id > -1) {
                article.id = id;
                success = true;
            }
        }

        if (success) {
            notifyProviderOnArticleChange();
        }

        return success;
    }


    private void notifyProviderOnArticleChange() {
        context.getContentResolver().notifyChange(ArticleProvider.URI_ARTICLE, null, false);
    }
}