Google ExoPlayerガイド

Question

私はExoPlayerで基本的なアプリケーションを構築するのに苦労しています。

Answer 1

あなたのbuild.gradle
コンパイル 'com.google.android.exoplayer：exoplayer：R2.1.1' でこれを追加する必要がまず

1.あなたのレイアウトファイル

<?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:layout_width="match_parent" 
    android:layout_height="match_parent" 
    > 
    <com.google.android.exoplayer2.ui.SimpleExoPlayerView 
     android:id="@+id/player_view" 
     android:focusable="true" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"/> 
</RelativeLayout> 

2.あなたのクラスファイル

public class ExoPlayerActivity extends AppCompatActivity implements ExoPlayer.EventListener { 
     SimpleExoPlayer player; 
     String path;  // it can be url of video for online streaming or a url of local video 

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

      // set your path here 
      path=<your path>; 

      // 1. Create a default TrackSelector 
      BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter(); 
      TrackSelection.Factory videoTrackSelectionFactory = 
        new AdaptiveVideoTrackSelection.Factory(bandwidthMeter); 
      TrackSelector trackSelector = 
        new DefaultTrackSelector(videoTrackSelectionFactory); 

      // 2. Create a default LoadControl 
      LoadControl loadControl = new DefaultLoadControl(); 
      // 3. Create the player 
      player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl); 

      SimpleExoPlayerView playerView = (SimpleExoPlayerView) findViewById(R.id.player_view); 
      playerView.setPlayer(player); 
      playerView.setKeepScreenOn(true); 
      // Produces DataSource instances through which media data is loaded. 
      DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "ExoPlayer")); 

      // Produces Extractor instances for parsing the media data. 
      ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory(); 

      // This is the MediaSource representing the media to be played. 
      MediaSource videoSource = new ExtractorMediaSource(Uri.parse(path), 
        dataSourceFactory, extractorsFactory, null, null); 
      // Prepare the player with the source. 
      player.addListener(this); 
      player.prepare(videoSource); 
      playerView.requestFocus(); 
      player.setPlayWhenReady(true);  // to play video when ready. Use false to pause a video 
     } 


     @Override 
     protected void onPause() { 
      super.onPause(); 
      if (player != null) { 
       player.setPlayWhenReady(false); //to pause a video because now our video player is not in focus 
      } 
     } 

     @Override 
     public void onTimelineChanged(Timeline timeline, Object manifest) { 

     } 

     @Override 
     public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) { 

     } 

     @Override 
     public void onLoadingChanged(boolean isLoading) { 

     } 

     @Override 
     public void onPlayerStateChanged(boolean playWhenReady, int playbackState) { 
      switch (playbackState) { 
       case ExoPlayer.STATE_BUFFERING: 
        //You can use progress dialog to show user that video is preparing or buffering so please wait 
        break; 
       case ExoPlayer.STATE_IDLE: 
        //idle state 
        break; 
       case ExoPlayer.STATE_READY: 
        // dismiss your dialog here because our video is ready to play now 
        break; 
       case ExoPlayer.STATE_ENDED: 
        // do your processing after ending of video 
        break; 
      } 
     } 

     @Override 
     public void onPlayerError(ExoPlaybackException error) { 
      // show user that something went wrong. I am showing dialog but you can use your way 
      AlertDialog.Builder adb = new AlertDialog.Builder(ExoPlayerActivity.this); 
      adb.setTitle("Could not able to stream video"); 
      adb.setMessage("It seems that something is going wrong.\nPlease try again."); 
      adb.setPositiveButton("OK", new DialogInterface.OnClickListener() { 
       @Override 
       public void onClick(DialogInterface dialog, int which) { 
        dialog.dismiss(); 
        finish(); // take out user from this activity. you can skip this 
       } 
      }); 
      AlertDialog ad = adb.create(); 
      ad.show(); 
     } 

     @Override 
     public void onPositionDiscontinuity() { 
      //Video is not streaming properly 
      Log.d("Mayur", "Discontinuity"); 
     } 

     @Override 
     protected void onDestroy() { 
      super.onDestroy(); 
      player.release(); //it is important to release a player 
     } 
    } 

初心者にはこれで十分だと思います。また、このライブラリの標準オーディオおよびビデオコンポーネントは、Android 4.1（APIレベル16）でリリースされたAndroidのMediaCodec APIに依存しています。 Android 4.0以降では動作しません。