package com.example.videotube;

public final class Config {

    private Config(){
    }

    public static final String YOUTUBE_API_KEY = "YOUR API KEY";

}

implementation files('libs/YouTubeAndroidPlayerApi.jar')

<uses-permission android:name="android.permission.INTERNET"/>

package com.example.videotube;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import com.google.android.youtube.player.YouTubeBaseActivity;
import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayerView;

public class MainActivity extends YouTubeBaseActivity implements YouTubePlayer.OnInitializedListener {

    private static final int RECOVERY_REQUEST = 1;
    private YouTubePlayerView youTubeView;

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

        youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_view);
        youTubeView.initialize(Config.YOUTUBE_API_KEY, this);

    }

    @Override
    public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player, boolean wasRestored) {
        if (!wasRestored) {
            player.cueVideo("fhWaJi1Hsfo"); // Plays https://www.youtube.com/watch?v=fhWaJi1Hsfo
        }
    }

    @Override
    public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult errorReason) {
        if (errorReason.isUserRecoverableError()) {
            errorReason.getErrorDialog(this, RECOVERY_REQUEST).show();
        } else {
            String error = String.format(getString(R.string.player_error), errorReason.toString());
            Toast.makeText(this, error, Toast.LENGTH_LONG).show();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == RECOVERY_REQUEST) {
            // Retry initialization if user performed a recovery action
            getYouTubePlayerProvider().initialize(Config.YOUTUBE_API_KEY, this);
        }
    }

    protected YouTubePlayer.Provider getYouTubePlayerProvider() {
        return youTubeView;
    }
}

<resources>
    <string name="app_name">VideoTube</string>
    <string name="player_error">Error initializing YouTube player: %s</string>
    <string name="seek_to">Jump To</string>
    <string name="seek_to_hint">Seconds</string>
</resources>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:tools="http://schemas.android.com/tools"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:context=".MainActivity">

    <com.google.android.youtube.player.YouTubePlayerView
        android:id="@+id/youtube_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</RelativeLayout>

package com.example.videotube;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import com.google.android.youtube.player.YouTubeBaseActivity;
import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayerView;

public class MainActivity extends YouTubeBaseActivity implements YouTubePlayer.OnInitializedListener {

    private static final int RECOVERY_REQUEST = 1;
    private YouTubePlayerView youTubeView;

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

        youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_view);
        youTubeView.initialize(Config.YOUTUBE_API_KEY, this);

    }

    @Override
    public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player, boolean wasRestored) {
        if (!wasRestored) {
            player.cueVideo("fhWaJi1Hsfo"); // Plays https://www.youtube.com/watch?v=fhWaJi1Hsfo
        }
    }

    @Override
    public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult errorReason) {
        if (errorReason.isUserRecoverableError()) {
            errorReason.getErrorDialog(this, RECOVERY_REQUEST).show();
        } else {
            String error = String.format(getString(R.string.player_error), errorReason.toString());
            Toast.makeText(this, error, Toast.LENGTH_LONG).show();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == RECOVERY_REQUEST) {
            // Retry initialization if user performed a recovery action
            getYouTubePlayerProvider().initialize(Config.YOUTUBE_API_KEY, this);
        }
    }

    protected YouTubePlayer.Provider getYouTubePlayerProvider() {
        return youTubeView;
    }
}

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

    private final class MyPlaybackEventListener implements YouTubePlayer.PlaybackEventListener {

        @Override
        public void onPlaying() {
            // Called when playback starts, either due to user action or call to play().
            showMessage("Playing");
        }

        @Override
        public void onPaused() {
            // Called when playback is paused, either due to user action or call to pause().
            showMessage("Paused");
        }

        @Override
        public void onStopped() {
            // Called when playback stops for a reason other than being paused.
            showMessage("Stopped");
        }

        @Override
        public void onBuffering(boolean b) {
            // Called when buffering starts or ends.
        }

        @Override
        public void onSeekTo(int i) {
            // Called when a jump in playback position occurs, either
            // due to user scrubbing or call to seekRelativeMillis() or seekToMillis()
        }
    }

    private final class MyPlayerStateChangeListener implements YouTubePlayer.PlayerStateChangeListener {

        @Override
        public void onLoading() {
            // Called when the player is loading a video
            // At this point, it's not ready to accept commands affecting playback such as play() or pause()
        }

        @Override
        public void onLoaded(String s) {
            // Called when a video is done loading.
            // Playback methods such as play(), pause() or seekToMillis(int) may be called after this callback.
        }

        @Override
        public void onAdStarted() {
            // Called when playback of an advertisement starts.
        }

        @Override
        public void onVideoStarted() {
            // Called when playback of the video starts.
        }

        @Override
        public void onVideoEnded() {
            // Called when the video reaches its end.
        }

        @Override
        public void onError(YouTubePlayer.ErrorReason errorReason) {
            // Called when an error occurs.
        }
    }

    private MyPlayerStateChangeListener playerStateChangeListener;
    private MyPlaybackEventListener playbackEventListener;

        playerStateChangeListener = new MyPlayerStateChangeListener();
        playbackEventListener = new MyPlaybackEventListener();

    @Override
    public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player, boolean wasRestored) {
        player.setPlayerStateChangeListener(playerStateChangeListener);
        player.setPlaybackEventListener(playbackEventListener);

        if (!wasRestored) {
            player.cueVideo("BLM2Fua8jZI"); // Plays https://www.youtube.com/watch?v=BLM2Fua8jZI
        }
    }

package com.example.videotube;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import com.google.android.youtube.player.YouTubeBaseActivity;
import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayerView;

public class MainActivity extends YouTubeBaseActivity implements YouTubePlayer.OnInitializedListener {

    private static final int RECOVERY_REQUEST = 1;
    private YouTubePlayerView youTubeView;
    
    private MyPlayerStateChangeListener playerStateChangeListener;
    private MyPlaybackEventListener playbackEventListener;

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

        youTubeView = (YouTubePlayerView) findViewById(R.id.youtube_view);
        youTubeView.initialize(Config.YOUTUBE_API_KEY, this);

        playerStateChangeListener = new MyPlayerStateChangeListener();
        playbackEventListener = new MyPlaybackEventListener();


    }

    @Override
    public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player, boolean wasRestored) {
        player.setPlayerStateChangeListener(playerStateChangeListener);
        player.setPlaybackEventListener(playbackEventListener);

        if (!wasRestored) {
            player.cueVideo("fhWaJi1Hsfo"); // Plays https://www.youtube.com/watch?v=fhWaJi1Hsfo
        }
    }

    @Override
    public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult errorReason) {
        if (errorReason.isUserRecoverableError()) {
            errorReason.getErrorDialog(this, RECOVERY_REQUEST).show();
        } else {
            String error = String.format(getString(R.string.player_error), errorReason.toString());
            Toast.makeText(this, error, Toast.LENGTH_LONG).show();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == RECOVERY_REQUEST) {
            // Retry initialization if user performed a recovery action
            getYouTubePlayerProvider().initialize(Config.YOUTUBE_API_KEY, this);
        }
    }

    protected YouTubePlayer.Provider getYouTubePlayerProvider() {
        return youTubeView;
    }


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

    private final class MyPlaybackEventListener implements YouTubePlayer.PlaybackEventListener {

        @Override
        public void onPlaying() {
            // Called when playback starts, either due to user action or call to play().
            showMessage("Playing");
        }

        @Override
        public void onPaused() {
            // Called when playback is paused, either due to user action or call to pause().
            showMessage("Paused");
        }

        @Override
        public void onStopped() {
            // Called when playback stops for a reason other than being paused.
            showMessage("Stopped");
        }

        @Override
        public void onBuffering(boolean b) {
            // Called when buffering starts or ends.
        }

        @Override
        public void onSeekTo(int i) {
            // Called when a jump in playback position occurs, either
            // due to user scrubbing or call to seekRelativeMillis() or seekToMillis()
        }
    }

    private final class MyPlayerStateChangeListener implements YouTubePlayer.PlayerStateChangeListener {

        @Override
        public void onLoading() {
            // Called when the player is loading a video
            // At this point, it's not ready to accept commands affecting playback such as play() or pause()
        }

        @Override
        public void onLoaded(String s) {
            // Called when a video is done loading.
            // Playback methods such as play(), pause() or seekToMillis(int) may be called after this callback.
        }

        @Override
        public void onAdStarted() {
            // Called when playback of an advertisement starts.
        }

        @Override
        public void onVideoStarted() {
            // Called when playback of the video starts.
        }

        @Override
        public void onVideoEnded() {
            // Called when the video reaches its end.
        }

        @Override
        public void onError(YouTubePlayer.ErrorReason errorReason) {
            // Called when an error occurs.
        }
    }

}

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

    <com.google.android.youtube.player.YouTubePlayerView
        android:id="@+id/youtube_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <EditText
            android:id="@+id/seek_to_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:inputType="number"
            android:hint="@string/seek_to_hint"/>

        <Button
            android:id="@+id/seek_to_button"
            android:text="@string/seek_to"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </LinearLayout>
</LinearLayout>

private YouTubePlayer player;

    @Override
    public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player, boolean wasRestored) {
        this.player = player;

        player.setPlayerStateChangeListener(playerStateChangeListener);
        player.setPlaybackEventListener(playbackEventListener);


        if (!wasRestored) {
            player.cueVideo("BLM2Fua8jZI"); // Plays https://www.youtube.com/watch?v=BLM2Fua8jZI
        }
    }

final EditText seekToText = (EditText) findViewById(R.id.seek_to_text);
Button seekToButton = (Button) findViewById(R.id.seek_to_button);
seekToButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        int skipToSecs = Integer.valueOf(seekToText.getText().toString());
        player.seekToMillis(skipToSecs * 1000);
    }
});

    implementation 'com.android.support:cardview-v7:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.squareup.picasso:picasso:2.5.2'
    implementation 'com.google.apis:google-api-services-youtube:v3-rev182-1.22.0'
    implementation 'com.google.http-client:google-http-client-android:1.20.0'
    implementation 'com.google.api-client:google-api-client-android:1.20.0'
    implementation 'com.google.api-client:google-api-client-gson:1.20.0'

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

        <activity android:name=".YouTubeActivity"></activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".YouTubeActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity">
        </activity>

        android:icon="@mipmap/logo"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/logo"

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Spinner
        android:id="@+id/youtube_playlist_spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/youtube_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical"
        android:layout_below="@id/youtube_playlist_spinner"/>
</RelativeLayout>

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/card_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    card_view:cardCornerRadius="4dp"
    card_view:cardPreventCornerOverlap="true"
    card_view:cardUseCompatPadding="true">

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/video_thumbnail"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:adjustViewBounds="true"
            android:scaleType="fitXY"
            tools:src="@drawable/ic_thumb_up" />

        <TextView
            android:id="@+id/video_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/video_thumbnail"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="12dp"
            android:layout_marginRight="12dp"
            android:layout_marginTop="8dp"
            android:fontFamily="sans-serif-light"
            android:textColor="@android:color/primary_text_light"
            android:textSize="18sp"
            tools:text="Video Title text that is long enough to make the line wrap around to the next line." />

        <RelativeLayout
            android:id="@+id/video_stats_line"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/video_title"
            android:layout_marginLeft="12dp"
            android:layout_marginRight="12dp">

            <TextView
                android:id="@+id/video_view_count"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:fontFamily="sans-serif-light"
                android:textColor="@android:color/primary_text_light"
                android:textSize="20sp"
                tools:text="119,313" />

            <ImageView
                android:id="@+id/video_share"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/video_view_count"
                android:src="@drawable/ic_share" />

            <TextView
                android:id="@+id/video_share_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBottom="@id/video_share"
                android:layout_below="@id/video_view_count"
                android:layout_marginLeft="8dp"
                android:layout_toRightOf="@id/video_share"
                android:fontFamily="sans-serif-light"
                android:gravity="center_vertical"
                android:text="Share"
                android:textColor="@android:color/primary_text_light"
                android:textSize="16sp" />

            <ImageView
                android:id="@+id/video_thumb_up"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBottom="@id/video_share"
                android:layout_below="@id/video_view_count"
                android:layout_toLeftOf="@+id/video_like_count"
                android:gravity="center_vertical"
                android:src="@drawable/ic_thumb_up" />

            <TextView
                android:id="@+id/video_like_count"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBottom="@id/video_share"
                android:layout_below="@id/video_view_count"
                android:layout_marginLeft="12dp"
                android:layout_marginRight="16dp"
                android:layout_toLeftOf="@+id/video_thumb_down"
                android:fontFamily="sans-serif-light"
                android:gravity="center_vertical"
                android:textColor="@android:color/primary_text_light"
                android:textSize="14sp"
                tools:text="99" />

            <ImageView
                android:id="@+id/video_thumb_down"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBottom="@id/video_share"
                android:layout_below="@id/video_view_count"
                android:layout_toLeftOf="@+id/video_dislike_count"
                android:gravity="center_vertical"
                android:src="@drawable/ic_thumb_down" />

            <TextView
                android:id="@+id/video_dislike_count"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBottom="@id/video_share"
                android:layout_alignParentRight="true"
                android:layout_below="@id/video_view_count"
                android:layout_marginLeft="12dp"
                android:fontFamily="sans-serif-light"
                android:gravity="center_vertical"
                android:textColor="@android:color/primary_text_light"
                android:textSize="14sp"
                tools:text="99" />

        </RelativeLayout>

        <LinearLayout
            android:id="@+id/video_duration"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_above="@id/video_title"
            android:layout_alignParentRight="true"
            android:layout_marginBottom="12dp"
            android:layout_marginLeft="12dp"
            android:layout_marginRight="12dp"
            android:background="@drawable/semi_transparent_box_with_border"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/video_dutation_text"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:fontFamily="sans-serif-light"
                android:gravity="center"
                android:paddingBottom="4dp"
                android:paddingLeft="8dp"
                android:paddingRight="8dp"
                android:paddingTop="4dp"
                android:text="--:--"
                android:textColor="@android:color/primary_text_dark" />
        </LinearLayout>

        <TextView
            android:id="@+id/video_description"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/video_stats_line"
            android:layout_marginBottom="8dp"
            android:layout_marginLeft="12dp"
            android:layout_marginRight="12dp"
            android:layout_marginTop="2dp"
            android:fontFamily="sans-serif-light"
            android:textColor="@android:color/secondary_text_light"
            tools:text="This is a sample description of the video item that is long enough to wrap around to the next line." />

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

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid
        android:color="@color/semi_transparent_black" />
    <stroke
        android:width="1dp"
        android:color="@android:color/background_light"/>
</shape>

<resources>
    <color name="colorPrimary">#008577</color>
    <color name="colorPrimaryDark">#00574B</color>
    <color name="colorAccent">#D81B60</color>
    <color name="semi_transparent_black">#90000000</color>
</resources>

<resources>
    <string name="player_error">Error initializing YouTube player: %s</string>
    <string name="seek_to">Jump To</string>
    <string name="seek_to_hint">Seconds</string>
    <string name="app_name">Nusa Animation</string>
    <string name="action_recycler_view">Daftar</string>
</resources>

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="android:spinnerStyle">@style/Widget.AppCompat.Spinner.Underlined</item>
        <item name="android:spinnerDropDownItemStyle">@style/Widget.AppCompat.TextView.SpinnerItem</item>
    </style>

</resources>

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.akoscz.youtube.YouTubeActivity" >

    <item android:id="@+id/action_recyclerview"
        android:title="@string/action_recycler_view"
        android:orderInCategory="101"
        app:showAsAction="never" />

</menu>

package com.example.videotube.model;

import com.google.api.services.youtube.model.Video;

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

public class PlaylistVideos extends ArrayList<Video>{
    public final String playlistId;
    private String mNextPageToken;

    public PlaylistVideos(String id) {
        playlistId = id;
    }
    public void setNextPageToken(String nextPageToken) {
        mNextPageToken = nextPageToken;
    }
    public String getNextPageToken() {
        return mNextPageToken;
    }
}

package com.example.videotube;


import android.os.AsyncTask;
import android.text.TextUtils;
import android.util.Log;
import android.util.Pair;

import com.google.api.services.youtube.YouTube;
import com.google.api.services.youtube.model.PlaylistItem;
import com.google.api.services.youtube.model.PlaylistItemListResponse;
import com.google.api.services.youtube.model.Video;
import com.google.api.services.youtube.model.VideoContentDetails;
import com.google.api.services.youtube.model.VideoListResponse;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public abstract class GetPlaylistAsyncTask extends AsyncTask<String, Void, Pair<String, List<Video>>> {
    private static final String TAG = "GetPlaylistAsyncTask";
    private static final Long YOUTUBE_PLAYLIST_MAX_RESULTS = 20L;

    //see: https://developers.google.com/youtube/v3/docs/playlistItems/list
    private static final String YOUTUBE_PLAYLIST_PART = "snippet";
    private static final String YOUTUBE_PLAYLIST_FIELDS = "pageInfo,nextPageToken,items(id,snippet(resourceId/videoId))";
    //see: https://developers.google.com/youtube/v3/docs/videos/list
    private static final String YOUTUBE_VIDEOS_PART = "snippet,contentDetails,statistics"; // video resource properties that the response will include.
    private static final String YOUTUBE_VIDEOS_FIELDS = "items(id,snippet(title,description,thumbnails/high),contentDetails/duration,statistics)"; // selector specifying which fields to include in a partial response.

    private YouTube mYouTubeDataApi;

    public GetPlaylistAsyncTask(YouTube api) {
        mYouTubeDataApi = api;
    }

    @Override
    protected Pair<String, List<Video>> doInBackground(String... params) {
        final String playlistId = params[0];
        final String nextPageToken;

        if (params.length == 2) {
            nextPageToken = params[1];
        } else {
            nextPageToken = null;
        }

        PlaylistItemListResponse playlistItemListResponse;
        try {
            playlistItemListResponse = mYouTubeDataApi.playlistItems()
                    .list(YOUTUBE_PLAYLIST_PART)
                    .setPlaylistId(playlistId)
                    .setPageToken(nextPageToken)
                    .setFields(YOUTUBE_PLAYLIST_FIELDS)
                    .setMaxResults(YOUTUBE_PLAYLIST_MAX_RESULTS)
                    .setKey(ApiKey.YOUTUBE_API_KEY)
                    .execute();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }

        if (playlistItemListResponse == null) {
            Log.e(TAG, "Failed to get playlist");
            return null;
        }

        List<String> videoIds = new ArrayList();

        // pull out the video id's from the playlist page
        for (PlaylistItem item : playlistItemListResponse.getItems()) {
            videoIds.add(item.getSnippet().getResourceId().getVideoId());
        }

        // get details of the videos on this playlist page
        VideoListResponse videoListResponse = null;
        try {
            videoListResponse = mYouTubeDataApi.videos()
                    .list(YOUTUBE_VIDEOS_PART)
                    .setFields(YOUTUBE_VIDEOS_FIELDS)
                    .setKey(ApiKey.YOUTUBE_API_KEY)
                    .setId(TextUtils.join(",", videoIds)).execute();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return new Pair(playlistItemListResponse.getNextPageToken(), videoListResponse.getItems());
    }
}

package com.example.videotube;

import android.os.AsyncTask;
import android.text.TextUtils;

import com.google.api.services.youtube.YouTube;
import com.google.api.services.youtube.model.PlaylistListResponse;

import java.io.IOException;

/**
 * This AsyncTask will get the titles of all the playlists that are passed in as a parameter.
 */
public class GetPlaylistTitlesAsyncTask  extends AsyncTask<String[], Void, PlaylistListResponse> {
    //see: https://developers.google.com/youtube/v3/docs/playlists/list
    private static final String YOUTUBE_PLAYLIST_PART = "snippet";
    private static final String YOUTUBE_PLAYLIST_FIELDS = "items(id,snippet(title))";

    private YouTube mYouTubeDataApi;

    public GetPlaylistTitlesAsyncTask(YouTube api) {
        mYouTubeDataApi = api;
    }

    @Override
    protected PlaylistListResponse doInBackground(String[]... params) {

        final String[] playlistIds = params[0];

        PlaylistListResponse playlistListResponse;
        try {
            playlistListResponse = mYouTubeDataApi.playlists()
                    .list(YOUTUBE_PLAYLIST_PART)
                    .setId(TextUtils.join(",", playlistIds))
                    .setFields(YOUTUBE_PLAYLIST_FIELDS)
                    .setKey(ApiKey.YOUTUBE_API_KEY)
                    .execute();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }

        return playlistListResponse;
    }
}

package com.example.videotube;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
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.example.videotube.model.PlaylistVideos;
import com.google.api.services.youtube.model.Video;
import com.google.api.services.youtube.model.VideoContentDetails;
import com.google.api.services.youtube.model.VideoSnippet;
import com.google.api.services.youtube.model.VideoStatistics;
import com.squareup.picasso.Picasso;

import java.text.DecimalFormat;


public class PlaylistCardAdapter extends RecyclerView.Adapter<PlaylistCardAdapter.ViewHolder> {
    private static final DecimalFormat sFormatter = new DecimalFormat("#,###,###");
    private final PlaylistVideos mPlaylistVideos;
    private final YouTubeRecyclerViewFragment.LastItemReachedListener mListener;

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final Context mContext;
        public final TextView mTitleText;
        public final TextView mDescriptionText;
        public final ImageView mThumbnailImage;
        public final ImageView mShareIcon;
        public final TextView mShareText;
        public final TextView mDurationText;
        public final TextView mViewCountText;
        public final TextView mLikeCountText;
        public final TextView mDislikeCountText;

        public ViewHolder(View v) {
            super(v);
            mContext = v.getContext();
            mTitleText = (TextView) v.findViewById(R.id.video_title);
            mDescriptionText = (TextView) v.findViewById(R.id.video_description);
            mThumbnailImage = (ImageView) v.findViewById(R.id.video_thumbnail);
            mShareIcon = (ImageView) v.findViewById(R.id.video_share);
            mShareText = (TextView) v.findViewById(R.id.video_share_text);
            mDurationText = (TextView) v.findViewById(R.id.video_dutation_text);
            mViewCountText= (TextView) v.findViewById(R.id.video_view_count);
            mLikeCountText = (TextView) v.findViewById(R.id.video_like_count);
            mDislikeCountText = (TextView) v.findViewById(R.id.video_dislike_count);
        }
    }

    public PlaylistCardAdapter(PlaylistVideos playlistVideos, YouTubeRecyclerViewFragment.LastItemReachedListener lastItemReachedListener) {
        mPlaylistVideos = playlistVideos;
        mListener = lastItemReachedListener;
    }

    // Create new views (invoked by the layout manager)
    @Override
    public PlaylistCardAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // inflate a card layout
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.youtube_video_card, parent, false);
        // populate the viewholder
        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        if (mPlaylistVideos.size() == 0) {
            return;
        }

        final Video video = mPlaylistVideos.get(position);
        final VideoSnippet videoSnippet = video.getSnippet();
        final VideoContentDetails videoContentDetails = video.getContentDetails();
        final VideoStatistics videoStatistics = video.getStatistics();

        holder.mTitleText.setText(videoSnippet.getTitle());
        holder.mDescriptionText.setText(videoSnippet.getDescription());

        // load the video thumbnail image
        Picasso.with(holder.mContext)
                .load(videoSnippet.getThumbnails().getHigh().getUrl())
                .placeholder(R.drawable.video_placeholder)
                .into(holder.mThumbnailImage);

        // set the click listener to play the video
        holder.mThumbnailImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                holder.mContext.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.youtube.com/watch?v=" + video.getId())));
            }
        });

        // create and set the click listener for both the share icon and share text
        View.OnClickListener shareClickListener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent sendIntent = new Intent();
                sendIntent.setAction(Intent.ACTION_SEND);
                sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Watch \"" + videoSnippet.getTitle() + "\" on YouTube");
                sendIntent.putExtra(Intent.EXTRA_TEXT, "https://www.youtube.com/watch?v=" + video.getId());
                sendIntent.setType("text/plain");
                holder.mContext.startActivity(sendIntent);
            }
        };
        holder.mShareIcon.setOnClickListener(shareClickListener);
        holder.mShareText.setOnClickListener(shareClickListener);

        // set the video duration text
        holder.mDurationText.setText(parseDuration(videoContentDetails.getDuration()));
        // set the video statistics
        holder.mViewCountText.setText(sFormatter.format(videoStatistics.getViewCount()));
        holder.mLikeCountText.setText(sFormatter.format(videoStatistics.getLikeCount()));
        holder.mDislikeCountText.setText(sFormatter.format(videoStatistics.getDislikeCount()));

        if (mListener != null) {
            // get the next playlist page if we're at the end of the current page and we have another page to get
            final String nextPageToken = mPlaylistVideos.getNextPageToken();
            if (!isEmpty(nextPageToken) && position == mPlaylistVideos.size() - 1) {
                holder.itemView.post(new Runnable() {
                    @Override
                    public void run() {
                        mListener.onLastItem(position, nextPageToken);
                    }
                });
            }
        }
    }

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

    private boolean isEmpty(String s) {
        if (s == null || s.length() == 0) {
            return true;
        }
        return false;
    }

    private String parseDuration(String in) {
        boolean hasSeconds = in.indexOf('S') > 0;
        boolean hasMinutes = in.indexOf('M') > 0;

        String s;
        if (hasSeconds) {
            s = in.substring(2, in.length() - 1);
        } else {
            s = in.substring(2, in.length());
        }

        String minutes = "0";
        String seconds = "00";

        if (hasMinutes && hasSeconds) {
            String[] split = s.split("M");
            minutes = split[0];
            seconds = split[1];
        } else if (hasMinutes) {
            minutes = s.substring(0, s.indexOf('M'));
        } else if (hasSeconds) {
            seconds = s;
        }

        // pad seconds with a 0 if less than 2 digits
        if (seconds.length() == 1) {
            seconds = "0" + seconds;
        }

        return minutes + ":" + seconds;
    }
}

package com.example.videotube;

import android.annotation.SuppressLint;
import android.content.res.Resources;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.Pair;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;


import com.example.videotube.model.PlaylistVideos;
import com.google.api.services.youtube.YouTube;
import com.google.api.services.youtube.model.PlaylistListResponse;
import com.google.api.services.youtube.model.Video;
import com.squareup.picasso.Picasso;

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


public class YouTubeRecyclerViewFragment extends Fragment {
    // the fragment initialization parameter
    private static final String ARG_YOUTUBE_PLAYLIST_IDS = "YOUTUBE_PLAYLIST_IDS";
    private static final int SPINNER_ITEM_LAYOUT_ID = android.R.layout.simple_spinner_item;
    private static final int SPINNER_ITEM_DROPDOWN_LAYOUT_ID = android.R.layout.simple_spinner_dropdown_item;

    private String[] mPlaylistIds;
    private ArrayList<String> mPlaylistTitles;
    private RecyclerView mRecyclerView;
    private PlaylistVideos mPlaylistVideos;
    private RecyclerView.LayoutManager mLayoutManager;
    private Spinner mPlaylistSpinner;
    private PlaylistCardAdapter mPlaylistCardAdapter;
    private YouTube mYouTubeDataApi;
    private ProgressDialog mProgressDialog;


    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param youTubeDataApi
     * @param playlistIds A String array of YouTube Playlist IDs
     * @return A new instance of fragment YouTubeRecyclerViewFragment.
     */
    public static YouTubeRecyclerViewFragment newInstance(YouTube youTubeDataApi, String[] playlistIds) {
        YouTubeRecyclerViewFragment fragment = new YouTubeRecyclerViewFragment();
        Bundle args = new Bundle();
        args.putStringArray(ARG_YOUTUBE_PLAYLIST_IDS, playlistIds);
        fragment.setArguments(args);
        fragment.setYouTubeDataApi(youTubeDataApi);
        return fragment;
    }

    public YouTubeRecyclerViewFragment() {
        // Required empty public constructor
    }

    public void setYouTubeDataApi(YouTube api) {
        mYouTubeDataApi = api;
    }

    @SuppressLint("StaticFieldLeak")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRetainInstance(true);
        if (getArguments() != null) {
            mPlaylistIds = getArguments().getStringArray(ARG_YOUTUBE_PLAYLIST_IDS);
        }

        // start fetching the playlist titles
        new GetPlaylistTitlesAsyncTask(mYouTubeDataApi) {
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
//                mProgressDialog.show();
            }

            @Override
            protected void onPostExecute(PlaylistListResponse playlistListResponse) {
                // if we didn't receive a response for the playlist titles, then there's nothing to update
                if (playlistListResponse == null)
                    return;

                mPlaylistTitles = new ArrayList();
                for (com.google.api.services.youtube.model.Playlist playlist : playlistListResponse.getItems()) {
                    mPlaylistTitles.add(playlist.getSnippet().getTitle());
                }
                // update the spinner adapter with the titles of the playlists
                ArrayAdapter<List<String>> spinnerAdapter = new ArrayAdapter(getContext(), android.R.layout.simple_spinner_item, mPlaylistTitles);
                spinnerAdapter.setDropDownViewResource(SPINNER_ITEM_DROPDOWN_LAYOUT_ID);
                mPlaylistSpinner.setAdapter(spinnerAdapter);
                mProgressDialog.hide();
            }
        }.execute(mPlaylistIds);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // set the Picasso debug indicator only for debug builds
        Picasso.with(getActivity()).setIndicatorsEnabled(BuildConfig.DEBUG);

        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.youtube_recycler_view_fragment, container, false);

        mRecyclerView = (RecyclerView) rootView.findViewById(R.id.youtube_recycler_view);
        // use this setting to improve performance if you know that changes
        // in content do not change the layout size of the RecyclerView
        mRecyclerView.setHasFixedSize(true);

        Resources resources = getResources();
//        if (resources.getBoolean(R.bool.isTablet)) {
//            // use a staggered grid layout if we're on a large screen device
//            mLayoutManager = new StaggeredGridLayoutManager(resources.getInteger(R.integer.columns), StaggeredGridLayoutManager.VERTICAL);
//        } else {
            // use a linear layout on phone devices
            mLayoutManager = new LinearLayoutManager(getActivity());
//        }

        mProgressDialog = new ProgressDialog(getContext());

        mRecyclerView.setLayoutManager(mLayoutManager);

        mPlaylistSpinner = (Spinner)rootView.findViewById(R.id.youtube_playlist_spinner);

        return rootView;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        // if we have a playlist in our retained fragment, use it to populate the UI
        if (mPlaylistVideos != null) {
            // reload the UI with the existing playlist.  No need to fetch it again
            reloadUi(mPlaylistVideos, false);
        } else {
            // otherwise create an empty playlist using the first item in the playlist id's array
            mPlaylistVideos = new PlaylistVideos(mPlaylistIds[0]);
            // and reload the UI with the selected playlist and kick off fetching the playlist content
            reloadUi(mPlaylistVideos, true);
        }

        ArrayAdapter<List<String>> spinnerAdapter;
        // if we don't have the playlist titles yet
        if (mPlaylistTitles == null || mPlaylistTitles.isEmpty()) {
            // initialize the spinner with the playlist ID's so that there's something in the UI until the GetPlaylistTitlesAsyncTask finishes
            spinnerAdapter = new ArrayAdapter(getContext(), SPINNER_ITEM_LAYOUT_ID, Arrays.asList(mPlaylistIds));
        } else {
            // otherwise use the playlist titles for the spinner
            spinnerAdapter = new ArrayAdapter(getContext(), SPINNER_ITEM_LAYOUT_ID, mPlaylistTitles);
        }

        spinnerAdapter.setDropDownViewResource(SPINNER_ITEM_DROPDOWN_LAYOUT_ID);
        mPlaylistSpinner.setAdapter(spinnerAdapter);

        // set up the onItemSelectedListener for the spinner
        mPlaylistSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                // reload the UI with the playlist video list of the selected playlist
                mPlaylistVideos = new PlaylistVideos(mPlaylistIds[position]);
                reloadUi(mPlaylistVideos, true);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {}
        });
    }

    private void reloadUi(final PlaylistVideos playlistVideos, boolean fetchPlaylist) {
        // initialize the cards adapter
        initCardAdapter(playlistVideos);

        if (fetchPlaylist) {
            // start fetching the selected playlistVideos contents
            new GetPlaylistAsyncTask(mYouTubeDataApi) {
                @Override
                public void onPostExecute(Pair<String, List<Video>> result) {
                    handleGetPlaylistResult(playlistVideos, result);
                }
            }.execute(playlistVideos.playlistId, playlistVideos.getNextPageToken());
        }
    }

    private void initCardAdapter(final PlaylistVideos playlistVideos) {
        // create the adapter with our playlistVideos and a callback to handle when we reached the last item
        mPlaylistCardAdapter = new PlaylistCardAdapter(playlistVideos, new LastItemReachedListener() {
            @Override
            public void onLastItem(int position, String nextPageToken) {
                new GetPlaylistAsyncTask(mYouTubeDataApi) {
                    @Override
                    public void onPostExecute(Pair<String, List<Video>> result) {
                        handleGetPlaylistResult(playlistVideos, result);
                    }
                }.execute(playlistVideos.playlistId, playlistVideos.getNextPageToken());
            }
        });
        mRecyclerView.setAdapter(mPlaylistCardAdapter);
    }

    private void handleGetPlaylistResult(PlaylistVideos playlistVideos, Pair<String, List<Video>> result) {
        if (result == null) return;
        final int positionStart = playlistVideos.size();
        playlistVideos.setNextPageToken(result.first);
        playlistVideos.addAll(result.second);
        mPlaylistCardAdapter.notifyItemRangeInserted(positionStart, result.second.size());
    }


    /**
     * Interface used by the {@link PlaylistCardAdapter} to inform us that we reached the last item in the list.
     */
    public interface LastItemReachedListener {
        void onLastItem(int position, String nextPageToken);
    }
}

package com.example.videotube;


import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import com.google.api.client.extensions.android.http.AndroidHttp;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.youtube.YouTube;

public class YouTubeActivity extends AppCompatActivity {

    private static final String[] YOUTUBE_PLAYLISTS = {
            "PLYc1pO20eF3h6Hb91ZpFXNjKqdYTN0HfM",
            "PLYc1pO20eF3iIzDcCwqOeyFt7g3_voXz9",
            "PLYc1pO20eF3hdduG6oKcLVqLI1zLdgzXy",
            "PLYc1pO20eF3jchZ2_7OS9gnjuLMkS58gp",
            "PLYc1pO20eF3i0IYKel6iZ6LUctTRSLjTE"
    };
    private YouTube mYoutubeDataApi;
    private final GsonFactory mJsonFactory = new GsonFactory();
    private final HttpTransport mTransport = AndroidHttp.newCompatibleTransport();

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


        if(!isConnected()){
            Toast.makeText(YouTubeActivity.this,"No Internet Connection Detected",Toast.LENGTH_LONG).show();
        }

        if (ApiKey.YOUTUBE_API_KEY.startsWith("YOUR_API_KEY")) {
            AlertDialog.Builder builder = new AlertDialog.Builder(this)
                    .setMessage("Edit ApiKey.java and replace \"YOUR_API_KEY\" with your Applications Browser API Key")
                    .setTitle("Missing API Key")
                    .setNeutralButton("Ok, I got it!", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            finish();
                        }
                    });

            AlertDialog dialog = builder.create();
            dialog.show();

        } else if (savedInstanceState == null) {
            mYoutubeDataApi = new YouTube.Builder(mTransport, mJsonFactory, null)
                    .setApplicationName(getResources().getString(R.string.app_name))
                    .build();

            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, YouTubeRecyclerViewFragment.newInstance(mYoutubeDataApi, YOUTUBE_PLAYLISTS))
                    .commit();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.you_tube, menu);
        return true;
    }

    public boolean isConnected() {
        ConnectivityManager cm =
                (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netInfo = cm.getActiveNetworkInfo();
        return netInfo != null && netInfo.isConnectedOrConnecting();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_recyclerview) {
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.container, YouTubeRecyclerViewFragment.newInstance(mYoutubeDataApi, YOUTUBE_PLAYLISTS))
                    .commit();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.videotube.YouTubeActivity"
    tools:ignore="MergeRootFrame" />