Android SurfaceView播放视频有声音无图像问题

最新推荐文章于 2018-11-16 10:49:06 发布

iteye_6233

最新推荐文章于 2018-11-16 10:49:06 发布

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文章标签： java 移动开发

本文探讨了在使用SurfaceView播放视频时遇到的有声音无图像问题，并详细解释了问题产生的原因及解决方案。通过实现surfaceHolder的addCallback()方法监听surfaceCreated事件，确保SurfaceView创建成功后再调用MediaPlayer播放，有效解决了该问题。

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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
		
	}

}