当我尝试将显示设置为MediaPlayer时,表面已被释放

时间:2013-04-24 14:41:50

标签: android surfaceview android-mediaplayer

我的xml文件:

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

我的setDisplay功能:

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();
    }
}

日志如下:

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)

我在这里发现了一些类似的问题,但所有这些都不适合我。等待你的答案。非常感谢。

6 个答案:

答案 0 :(得分:13)

表面可以被破坏。这就是为什么你需要将public void surfaceDestroyed(SurfaceHolder holder)添加到SurfaceView的实现中,如下所示:

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

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

您还应该添加一个处理Surface创建的函数:

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

以这种方式修改自己的功能:

    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();
    }

您还有另一个选项,就是Google建议您使用SurfaceView的方式:在一个单独的主题中。

答案 1 :(得分:10)

它与执行顺序有关,因为在设置MediaPlayer的显示之前必须先创建表面,所以你必须将回调方法surfaceCreated覆盖到以下内容:

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

现在你的play方法中没有setDisplay:

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();
    }
}

答案 2 :(得分:3)

使用SurfaceHolder.Callback,如下所示

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();
    }
});

答案 3 :(得分:2)

最简单的方法就是在setDisplay中调用surfaceCreated

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

并且不要忘记取消绑定表面:

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

注意:媒体播放器之前应在某处初始化,例如onCreate

答案 4 :(得分:1)

对于仍有问题的人,请尝试在您的activity / fragment / etc中实现 SurfaceHolder.Callback ,并在 onCreate / onCreateView 方法中调用 addCallback( SurfaceHolder.Callback回调)方法,使用您的activity / fragment / etc作为参数回调。

答案 5 :(得分:0)

我们可以查看VideoView源代码:

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

因此,我们可以了解应该在mediaplayer.setDisplay()方法中使用surfaceCreate