SurfaceView不顯示來自媒體播放器的視頻

Question

我正在製作一個自定義視頻播放器，並將其與視頻播放器一起使用，但是當我運行該應用程序時，它只顯示黑屏並播放音頻。

我的代碼：

public class MainActivity extends Activity implements SurfaceHolder.Callback { 

    private SeekBar seekbar; 
    private ImageView ivPlay; 
    private SurfaceView surfaceView; 
    private SurfaceHolder surfaceHolder; 
    private MediaPlayer mediaPlayer; 
    private Handler mHandler; 
    private Utilities utils; 

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

    private void initObjects() { 
     seekbar = (SeekBar) findViewById(R.id.sbVideo); 
     seekbar.setOnSeekBarChangeListener(seekbarChangeListener); 
     mHandler = new Handler(); 
     utils = new Utilities(); 
     ivPlay = (ImageView) findViewById(R.id.ivPlay); 
     ivPlay.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View view) { 
       if (mediaPlayer.isPlaying()) { 
        if (mediaPlayer != null) { 
         mediaPlayer.pause(); 
         // Changing button image to play button 
         ivPlay.setImageResource(R.drawable.ic_media_play); 
        } 
       } else { 
        // Resume song 
        if (mediaPlayer != null) { 
         mediaPlayer.start(); 
         // Changing button image to pause button 
         ivPlay.setImageResource(R.drawable.ic_media_pause); 
        } 
       } 

      } 
     }); 
     surfaceView = (SurfaceView) findViewById(R.id.svVideoSurface); 
     surfaceHolder = surfaceView.getHolder(); 
     surfaceHolder.addCallback(this); 
     surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 

     mediaPlayer = new MediaPlayer(); 
     mediaPlayer.setDisplay(surfaceHolder); 
    } 

    public void playVideo() { 
     // Play song 

     Uri uri = Uri 
       .parse("android.resource://com.videoplayer.demo/raw/title_video1"); 

     try { 

      mediaPlayer.reset(); 
      mediaPlayer.setDataSource(MainActivity.this, uri); 

      mediaPlayer.prepare(); 
      mediaPlayer.start(); 

      // Changing Button Image to pause image 
      ivPlay.setImageResource(R.drawable.ic_media_pause); 

      // set Progress bar values 
      seekbar.setProgress(0); 
      seekbar.setMax(100); 

      // Updating progress bar 
      updateProgressBar(); 
     } catch (IllegalArgumentException e) { 
      e.printStackTrace(); 
     } catch (IllegalStateException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    private OnSeekBarChangeListener seekbarChangeListener = new OnSeekBarChangeListener() { 

     @Override 
     public void onStopTrackingTouch(SeekBar seekbar) { 
      mHandler.removeCallbacks(mUpdateTimeTask); 
      int totalDuration = mediaPlayer.getDuration(); 
      int currentPosition = utils.progressToTimer(seekbar.getProgress(), 
        totalDuration); 

      // forward or backward to certain seconds 
      mediaPlayer.seekTo(currentPosition); 

      // update timer progress again 
      updateProgressBar(); 

     } 

     @Override 
     public void onStartTrackingTouch(SeekBar seekbar) { 
      // TODO Auto-generated method stub 
      mHandler.removeCallbacks(mUpdateTimeTask); 
     } 

     @Override 
     public void onProgressChanged(SeekBar seekbar, int progress, 
       boolean fromUser) { 
      // TODO Auto-generated method stub 

     } 
    }; 

    @Override 
    public void surfaceChanged(SurfaceHolder holder, int arg1, int arg2, int arg3) { 
     mediaPlayer.setDisplay(holder); 

    } 

    @Override 
    public void surfaceCreated(SurfaceHolder holder) { 

    } 

    @Override 
    public void surfaceDestroyed(SurfaceHolder arg0) { 
     // TODO Auto-generated method stub 

    } 

    public void updateProgressBar() { 
     mHandler.postDelayed(mUpdateTimeTask, 100); 
    } 

    private Runnable mUpdateTimeTask = new Runnable() { 
     public void run() { 
      long totalDuration = mediaPlayer.getDuration(); 
      long currentDuration = mediaPlayer.getCurrentPosition(); 

      // Updating progress bar 
      int progress = (int) (utils.getProgressPercentage(currentDuration, 
        totalDuration)); 
      // Log.d("Progress", ""+progress); 
      seekbar.setProgress(progress); 

      // Running this thread after 100 milliseconds 
      mHandler.postDelayed(this, 100); 
     } 
    }; 

    @Override 
    protected void onDestroy() { 
     super.onDestroy(); 
     mediaPlayer.release(); 
    }; 
} 

我不知道我在做什麼錯了，任何幫助將是巨大的。

Answer 1

試試這個，它會幫助你！

@Override 
public void surfaceCreated(SurfaceHolder holder) { 
    if(player == null) { 
     player = new MediaPlayer(); 
    } 
    player.setDisplay(holder); 
}