请教：SurfaceView+mediaplayer有声音无视频是怎么回事？

[niitqin]

import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class MediaPlayDemo extends Activity {
	private SurfaceView surfaceView = null ;
	private SurfaceHolder surfaceHolder = null ;
	private MediaPlayer mp = null ;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        surfaceView = new SurfaceView(this);
		this.surfaceHolder = this.surfaceView.getHolder();
		this.surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		this.setContentView(this.surfaceView);
		
		this.mp = new MediaPlayer();
		try {
			mp.setDataSource("/sdcard/wozhinvrenxin.mp4");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		this.mp.setDisplay(surfaceHolder);
		this.mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
		try {
			this.mp.prepare();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		this.mp.start();
    }
}

[AMinfo]

原因是：MediaPlayer开始播放后，SurfaceView还没有创建出来，因此会出现有声音没图像，解决办法：

通过surfaceHolder.addCallback监听surfaceCreate事件后再播放；

public class MediaPlayDemo extends Activity implements SurfaceHolder.Callback
{
private SurfaceView surfaceView = null ;
private SurfaceHolder surfaceHolder = null ;
private MediaPlayer mp = null ;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
surfaceView = new SurfaceView(this);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceHolder.addCallback(this);
setContentView(surfaceView);


}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub

}

@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
mp = new MediaPlayer();
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
mp.setDisplay(surfaceHolder);
try {
mp.setDataSource("/sdcard/DownAndPlay/xyj.mp4");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
mp.prepare();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mp.start();
}

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

}

}

[AMinfo]

上面代码中mp4路径要改一下。

[CyberLogix]

SurfaceView没有创建成功，所以没有视频

[niitqin]

问题已经解决了，1楼，2楼正解。
谢谢。

[niitqin]

问题已经解决了，1楼，3楼正解。
谢谢。