exoplayerでオフラインの曲を再生する

Question

exoplayer2.2を使用してオフラインの曲を再生できません。

これは私のコードです。

public void initializePlayer(View view) { 
    playerView = view.findViewById(R.id.player_background_view); 
    playerView.setPlayer(player); 
    player.setPlayWhenReady(true); 
    player.seekTo(currentWindow, playbackPosition); 
    Uri uri = Uri.parse("file:///storage/sdcard0/Sounds/Music/song.mp3"); 
    MediaSource mediaSource = buildMediaSource(uri); 
    player.prepare(mediaSource, true, true); 
} 

private MediaSource buildMediaSource(Uri uri) { 
    return new ExtractorMediaSource(uri, 
      new DefaultHttpDataSourceFactory("exoplayer-codelab"), 
      new DefaultExtractorsFactory(), null, null); 
} 

次のエラーが発生しています。

ExoPlayerImplInternal: Source error. com.google.android.exoplayer2.upstream.Loader$UnexpectedLoaderException: Unexpected ClassCastException: libcore.net.url.FileURLConnection cannot be cast to java.net.HttpURLConnection 
                         at com.google.android.exoplayer2.upstream.Loader$LoadTask.run(Loader.java:317) 
                         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
                         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
                         at java.lang.Thread.run(Thread.java:841) 
                        Caused by: java.lang.ClassCastException: libcore.net.url.FileURLConnection cannot be cast to java.net.HttpURLConnection 
                         at com.google.android.exoplayer2.upstream.DefaultHttpDataSource.makeConnection(DefaultHttpDataSource.java:393) 
                         at com.google.android.exoplayer2.upstream.DefaultHttpDataSource.makeConnection(DefaultHttpDataSource.java:350) 
                         at com.google.android.exoplayer2.upstream.DefaultHttpDataSource.open(DefaultHttpDataSource.java:192) 
                         at com.google.android.exoplayer2.source.ExtractorMediaPeriod$ExtractingLoadable.load(ExtractorMediaPeriod.java:640) 
                         at com.google.android.exoplayer2.upstream.Loader$LoadTask.run(Loader.java:295) 
                         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)  
                         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)  
                         at java.lang.Thread.run(Thread.java:841)  

誰でも助けてください。

Answer 1

私は自分自身に

public void initializePlayer(Song song, View view) { 
    String source = "file:///storage/sdcard0/Sounds/Music/song.mp3"; 
    Context mContext = getApplicationContext(); 
    if (mExoPlayer == null) { 
     mExoPlayer = 
       ExoPlayerFactory.newSimpleInstance(
         new DefaultRenderersFactory(this), new DefaultTrackSelector(), new 
           DefaultLoadControl()); 
    } 
    mExoPlayer.setPlayWhenReady(true); 
    DataSource.Factory dataSourceFactory = 
      new DefaultDataSourceFactory(
        mContext, Util.getUserAgent(mContext, "Music Player"), null); 
    ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory(); 
    // The MediaSource represents the media to be played. 
    MediaSource mediaSource = 
      new ExtractorMediaSource(
        Uri.parse(source), dataSourceFactory, extractorsFactory, null, null); 
    mExoPlayer.prepare(mediaSource, true, true); 
} 

に答えるました