Android MediaPlayer - onBackPressed（）不工作

我有一个应用程序，只是在循环播放相同的视频。一切都按预期工作，除了一件事：Android MediaPlayer - onBackPressed（）不工作

我想停止播放，如果我按后退按钮，但我无法让它工作。我的活动简直无视我按下它，而是我得到一个ANR。我认为使用onBackPressed（）应该处理这种情况。谁能告诉我，我做错了什么？

这里是我的代码：

package dk.test.videoplayer; 

import android.media.MediaPlayer; 
import android.media.MediaPlayer.OnBufferingUpdateListener; 
import android.media.MediaPlayer.OnCompletionListener; 
import android.media.MediaPlayer.OnPreparedListener; 
import android.media.MediaPlayer.OnVideoSizeChangedListener; 
import android.net.Uri; 
import android.os.Bundle; 
import android.app.Activity; 
import android.view.MotionEvent; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.Window; 
import android.view.WindowManager; 
import android.widget.Toast; 

public class MainActivity extends Activity implements 
OnBufferingUpdateListener, OnCompletionListener, OnPreparedListener, OnVideoSizeChangedListener, SurfaceHolder.Callback, OnClickListener { 

    private SurfaceView mSurfaceView = null; 
    private SurfaceHolder mSurfaceHolder = null; 
    private String videoPath; 
    private MediaPlayer mMediaPlayer = null; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     System.out.println("onCreate called"); 

     getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN | 
       WindowManager.LayoutParams.TYPE_APPLICATION_PANEL | 
       WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | 
       WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD | 
       WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | 
       WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON); 

     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE); 

     mSurfaceView = new SurfaceView(this); 
     setContentView(mSurfaceView); 
     mSurfaceView.setOnClickListener(this); 

     mSurfaceHolder = mSurfaceView.getHolder(); 
     mSurfaceHolder.addCallback(this); 

     videoPath = "android.resource://dk.beatpro.videoplayer/raw/demo_video"; 
     try { 
      mMediaPlayer = new MediaPlayer(); 
      mMediaPlayer.setOnBufferingUpdateListener(this); 
      mMediaPlayer.setOnCompletionListener(this); 
      mMediaPlayer.setOnPreparedListener(this); 
      mMediaPlayer.setOnVideoSizeChangedListener(this); 
      mMediaPlayer.setScreenOnWhilePlaying(true); 
     } 
     catch (Exception e) { 
      System.out.println(e.toString()); 
     } 

    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     System.out.println("onResume called"); 

    } 

    @Override 
    public void onVideoSizeChanged(MediaPlayer mp, int width, int height) { 

    } 

    @Override 
    public void onPrepared(MediaPlayer mp) { 
     System.out.println("onPrepared called"); 
     if (!mMediaPlayer.isPlaying()) 
      mMediaPlayer.start(); 
    } 

    @Override 
    public void onCompletion(MediaPlayer mp) { 
    System.out.println("onCompletion() called"); 
     playVideo(); 
    } 

    @Override 
    public void onBufferingUpdate(MediaPlayer mp, int percent) { 

    } 

    @Override 
    protected void onPause() { 
     // TODO Auto-generated method stub 
     super.onPause(); 
     System.out.println("onPause() called"); 

     releaseMediaPlayer(); 
    } 

    @Override 
    protected void onDestroy() { 
     // TODO Auto-generated method stub 
     super.onDestroy(); 

     releaseMediaPlayer(); 
    } 

    public void surfaceCreated(SurfaceHolder holder) { 
     System.out.println("surfaceCreated() called"); 

     mMediaPlayer.setDisplay(mSurfaceHolder); 
     playVideo(); 
    } 

    private void playVideo() { 
     System.out.println("playVideo() called"); 
     try { 
      mMediaPlayer.reset(); 
      mMediaPlayer.setDataSource(this, Uri.parse(videoPath)); 
      mMediaPlayer.setDisplay(mSurfaceHolder); 
      mMediaPlayer.prepareAsync(); 
     } 
     catch (Exception e) { 
      System.out.println(e.toString()); 
     } 
    } 

    private void releaseMediaPlayer() { 
     if (mMediaPlayer != null) { 
      if (mMediaPlayer.isPlaying()) 
       mMediaPlayer.stop(); 
      mMediaPlayer.release(); 
      mMediaPlayer = null; 
     } 
    } 

    @Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, 
      int height) { 
     System.out.println("surfaceChanged() called"); 

    } 

    @Override 
    public void surfaceDestroyed(SurfaceHolder holder) { 
     System.out.println("surfaceDestroyed() called"); 

    } 

    @Override 
    public void onBackPressed() { 
     System.out.println("onBackPressed() called"); 
     releaseMediaPlayer(); 
     super.onBackPressed(); 
    } 

    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
     // TODO Auto-generated method stub 
     Toast.makeText(this, "Touch event", Toast.LENGTH_SHORT).show(); 
     return super.onTouchEvent(event); 
    } 

    @Override 
    public void onClick(View v) { 
     System.out.println("onClick() called"); 
     Toast.makeText(this, "Click click", Toast.LENGTH_SHORT).show(); 
    } 
}

来源

2014-01-29 Jon Helt-Hansen

你试过在releaseMediaPlayer（）之前调用super.onBackPressed吗？ – SoulRayder

呼叫super.onBackPressed();在onBackPressed（..）代码之前

来源

2014-01-29 11:01:31 Aashir

@Override 
public void onBackPressed() { 
    super.onBackPressed(); 
    System.out.println("onBackPressed() called"); 
    releaseMediaPlayer(); 

}

释放媒体播放器之前，只要打电话super.onBackPressed。

编辑： 也可以尝试在你的releaseMediaPlayer（）方法去除

mMediaPlayer=null;

声明。

来源

2014-01-29 11:02:30 SoulRayder

那真的没有帮助:( –

它给出了什么异常？或者错误？ – SoulRayder

没有 - 没有什么。只有一点是，我稍后得到“应用程序未响应” –

Android MediaPlayer - onBackPressed（）不工作

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