Android视频与音频复用一个MediaPlayer注意点

在使用SurfaceView+MediaPlayer播放视频，会使用到SurfaceHolder.Callback 并通过SurfaceHolder.addCallback添加到SurfaceView.getHolder()对象当中，其中SurfaceCallback为SurfaceHolder.Callback 的实例。

if (mSurfaceCallback == null) {
SurfaceHolder holder = mSurfaceView.getHolder();
mSurfaceCallback = new SurfaceCallback();
holder.addCallback(mSurfaceCallback);
}

SurfaceCallback具体实现如下，其在SurfaceView变为可见状态(VISIBLE)时，会调用surfaceCreated方法，在改方法里面调用 mMediaPlayer.setDisplay(surfaceHolder)进行跟MediaPlayer的绑定，在SurfaceView变为不可见状态（INVISIBLE&GONE)，会调用surfaceDestoryed方法，注意在surfaceDestoryed中，需要对应的解除绑定，这样在后续复用MediaPlayer播放纯音频文件时才不会报错。

private class SurfaceCallback implements SurfaceHolder.Callback {@Overridepublic void surfaceCreated(SurfaceHolder surfaceHolder) {Log.d(TAG, "surfaceCreated");if (mMediaPlayer != null) {mMediaPlayer.setDisplay(surfaceHolder);}}@Overridepublic void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {Log.d(TAG, "surfaceChanged");}@Overridepublic void surfaceDestroyed(SurfaceHolder surfaceHolder) {Log.d(TAG, "surfaceDestroyed");if (mMediaPlayer != null) {mMediaPlayer.setDisplay(null);}}
}

同时在播放纯音频的方法中时，也注意手动置null，mMediaPlayer.setDisplay(null);

public final void playAudio() {Log.d(TAG, "playAudio");stopAudio();if (mMediaPlayer == null) {initMediaPlayer();}try {mMediaPlayer.setDisplay(null);mMediaPlayer.reset();mMediaPlayer.setOnCompletionListener(null);AssetFileDescriptor openFd = getAssets().openFd("xxx.mp3");mMediaPlayer.setDataSource(openFd.getFileDescriptor(), openFd.getStartOffset(), openFd.getLength());mMediaPlayer.setLooping(true);mMediaPlayer.prepareAsync();} catch (Exception e) {e.printStackTrace();stopAudio();}}

否则会报如下错误：

2022-08-28 01:06:13.468 458-522/? D/SurfaceUtils: connecting to surface 0xb4a9a008, reason setVideoSurfaceTexture
2022-08-28 01:06:13.469 362-1171/? E/BufferQueueProducer: SurfaceView - com.example.test/com.example.test.autotest.AutoTestActivity#1 connect: BufferQueue has been abandoned
2022-08-28 01:06:13.469 458-522/? E/SurfaceUtils: Failed to connect to surface 0xb4a9a008, err -19
2022-08-28 01:06:13.469 458-522/? E/MediaPlayerService: setVideoSurfaceTexture failed: -19
2022-08-28 01:06:13.469 458-522/? D/NuPlayerDriver: reset(0xb4ff70e0) at state 2
2022-08-28 01:06:13.469 458-971/? D/NuPlayerDriver: notifyResetComplete(0xb4ff70e0)
2022-08-28 01:06:13.470 653-653/com.example.text W/System.err: java.lang.IllegalStateException
2022-08-28 01:06:13.471 653-653/com.example.test W/System.err:     at android.media.MediaPlayer.prepareAsync(Native Method)

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