The surface has been released when I try to setDis

问题:

My xml file:

<SurfaceView
    android:id="@+id/surfaceView"
    android:layout_marginTop="50dp"
    android:layout_width="fill_parent"
    android:layout_height="300dp" />

My function to setDisplay:

public void playVideo() {
    MediaPlayer mp = new MediaPlayer();
    SurfaceView sv = (SurfaceView) this.findViewById(R.id.surfaceView);
    try {
        mp.setDataSource("sdcard/test/a.3gp");
        SurfaceHolder sh = sv.getHolder();
        mp.setDisplay(sh);***----the exception occured here***
        mp.prepare();
        mp.start();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (SecurityException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

the log as below:

04-24 22:19:33.645: W/System.err(16106): java.lang.IllegalArgumentException: The surface has been released
04-24 22:19:33.645: W/System.err(16106):    at android.media.MediaPlayer._setVideoSurface(Native Method)
04-24 22:19:33.645: W/System.err(16106):    at android.media.MediaPlayer.setDisplay(MediaPlayer.java:698)

I have found some similar questions here, but all of those are not suit for me. Waiting for your answers. Thanks very much.

回答1:

The Surface can be destroyed. That's why you need to add to the a public void surfaceDestroyed(SurfaceHolder holder) to your SurfaceView's implementation like this:

  @Override
public void surfaceDestroyed(SurfaceHolder holder) {
    synchronized (this) {
        hasActiveHolder = false;

        synchronized(this)          {
              this.notifyAll(); 
        }
    } 
}

You should also add a function that handles Surface creation:

@Override
public void surfaceCreated(SurfaceHolder holder) {
     synchronized (this) {
        hasActiveHolder = true;
        this.notifyAll()
     }
}

And modify your own function this way:

    mp.setDataSource("sdcard/test/a.3gp");
    SurfaceHolder sh = sv.getHolder();
    synchronized (this) {
       while (!hasActiveHolder) {
              try {
                  this.wait();
              } catch (InterruptedException e) {
                //Print something
              }
        }
        mp.setDisplay(sh);
        mp.prepare();
    }

You have another option which is the way Google suggests you use SurfaceView: in a separate thread.

回答2:

It's something related to the sequence of executing, as the surface has to be created first before setting display for the MediaPlayer, so you have to override the callback method surfaceCreated to the following:

@Override
public void surfaceCreated(SurfaceHolder holder) {
    mp.setDisplay(sh); // now "mp" is defined as a class variable
}

and now there is no need to setDisplay inside your play method:

private MediaPlayer mp; // to use it inside surfaceCreated callback method
public void playVideo() {
    mp = new MediaPlayer();
    SurfaceView sv = (SurfaceView) this.findViewById(R.id.surfaceView);
    try {
        mp.setDataSource("sdcard/test/a.3gp");
        SurfaceHolder sh = sv.getHolder();
        mp.prepare();
        mp.start();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (SecurityException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

回答3:

Make use of SurfaceHolder.Callback as below

SurfaceView mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
SurfaceHolder holder = mSurfaceView.getHolder();
final MediaPlayer player = new MediaPlayer();

holder.addCallback(new SurfaceHolder.Callback() {
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        player.setDisplay(holder);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, 
    int height) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }
});

String UrlPath="android.resource://"+getActivity().getPackageName()+"/"+R.raw.your_file_name_without_extension;
try {
    player.setDataSource(getActivity(),Uri.parse(UrlPath));
    player.prepareAsync();
} catch (IOException e) {
    e.printStackTrace();
}
player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

    @Override
    public void onPrepared(MediaPlayer mp) {
        mp.start();
    }
});

回答4:

The simplest way is just to call setDisplay in surfaceCreated:

@Override
public void surfaceCreated(SurfaceHolder holder) {
    mp.setDisplay(holder)
}

and don't forget to unbind surface:

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    mp.setDisplay(null);
}

Note: media player should be initialized somewhere before, for example in onCreate.

回答5:

For those still having issues, try implementing SurfaceHolder.Callback in your activity/fragment/etc and at the onCreate/onCreateView method, call the addCallback(SurfaceHolder.Callback callback) method, using your activity/fragment/etc as the parameter callback.

回答6:

We can look at VideoView source code:

SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback(){
...
    public void surfaceCreated(SurfaceHolder holder)
    {
        mSurfaceHolder = holder;
        openVideo();
    }
    private void openVideo() {
        ...
        mMediaPlayer = new MediaPlayer();
        mMediaPlayer.setDisplay(mSurfaceHolder);
    }
}

So we can learn that we should use mediaplayer.setDisplay() in surfaceCreate method be called.