Android SurfaceView播放视频有声音无图像问题

在用SurfaceView播放视频时，如果处理不当，会出现有声音无图像的问题，主要的原因是，在调用MediaPlayer开始播放视频时，SurfaceView却还未创建成功，解决办法是判断SurfaceView创建成功后再调用MediaPlayer的播放，通过surfaceHolder的addCallBack()方法来监听surfaceCreated。

 

以下是2段源码，第1段有声音无图像，第2段有声音有图像

 

源码1：有声音无图像

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 MainActivity 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);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        setContentView(surfaceView);

        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();

    }
}

 

 

源码2：有声音有图像

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 MainActivity 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

    }