BroadCast接收器错误

Question

为什么这不起作用？我有activityClass（PlayListActivity.java）和一个serviceClass（AudioService.java）。当我点击ListView时，歌曲应该开始播放，但这不是正在发生。当我点击ListView时，它会关闭没有错误的应用程序（例如forced close）。

我得到这个错误的logcat：

活动com.example.serviceaudio.PlayListActivity已经泄露，最初这里必然

致命异常ServiceConnection com.example.serviceaudio.PlayListActivity$AudioPlayerServiceConnection@41b1c448：马宁 了java.lang.RuntimeException：错误recieving广播意向{act=com.example.serviceaudio.AudioService$AudioPlayerBroadCastResiever@41bdf88

这里是我的代码：

PlayListActivity.java

public class PlayListActivity extends ListActivity { 

public ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>(); 
private ServiceConnection serviceConnection = new AudioPlayerServiceConnection(); 
private AudioService audioPlayer; 
private Intent audioPlayerIntent; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.playlist); 

    audioPlayerIntent = new Intent(this, AudioService.class); 
    bindService(audioPlayerIntent, serviceConnection, Context.BIND_AUTO_CREATE); 

    ArrayList<HashMap<String, String>> songsListData = new ArrayList<HashMap<String, String>>(); 

    SongManager plm = new SongManager(); 
    this.songsList = plm.getPlayList(this); 

    for (int i = 0; i < songsList.size(); i++) { 
     HashMap<String, String> song = songsList.get(i); 
     songsListData.add(song); 
    }// end loop 

    ListAdapter adapter = new SimpleAdapter(this, songsListData, 
      R.layout.playlist_item, new String[] { "songTitle","songArtist"}, new int[] { 
        R.id.songTitle, R.id.songArtist }); 
    setListAdapter(adapter); 

    ListView lv = getListView(); 
    lv.setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 

     playSong(position); 



     finish(); 

     } 

    }); 
} 

private final class AudioPlayerServiceConnection implements ServiceConnection { 
    public void onServiceConnected(ComponentName className, IBinder baBinder) { 
     audioPlayer = ((AudioService.AudioPlayerBinder) baBinder).getService(); 
     startService(audioPlayerIntent); 
    } 

    public void onServiceDisconnected(ComponentName className) { 
     audioPlayer = null; 
    } 
} 

public void playSong(int songIndex){ 
    Intent intent = new Intent(AudioService.PLAY_SONG); 
    intent.putExtra("songIndex", songIndex); 
    this.sendBroadcast(intent); 
    } 

} 

AudioService.java

public class AudioService extends Service implements OnCompletionListener{ 

public static final String PLAY_SONG_BASE = "com.example.serviceaudio.AudioService"; 
public static final String PLAY_SONG = PLAY_SONG_BASE + ".PLAY_SONG"; 
private ArrayList<HashMap<String, String >> songList = new ArrayList<HashMap<String, String>>(); 
private SongManager songManager = new SongManager(); 
private MediaPlayer mp; 
private AudioPlayerBroadcastReceiver broadcastReceiver = new AudioPlayerBroadcastReceiver(); 

public int currentSongIndex; 


public class AudioPlayerBinder extends Binder { 
    public AudioService getService() { 
     return AudioService.this; 
    } 
} 

private final IBinder audioPlayerBinder = new AudioPlayerBinder(); 

@Override 
public IBinder onBind(Intent intent) { 
    return audioPlayerBinder; 
} 

@Override 
public void onCreate() { 
    IntentFilter intentFilter = new IntentFilter(); 
    intentFilter.addAction(PLAY_SONG); 
    registerReceiver(broadcastReceiver, intentFilter); 



} 

@Override 
public void onStart(Intent intent, int startId) { 

} 

@Override 
public void onDestroy() { 

    //release(); 
} 

@Override 
public void onLowMemory() { 

    stopSelf(); 
} 

@Override 
public void onCompletion(MediaPlayer arg0) { 
    // TODO Auto-generated method stub 

} 

    private void release() { 
     if(mp == null) { 
      return; 
     } 

     if (mp.isPlaying()) { 
      mp.stop(); 
     } 
     mp.release(); 
     mp = null; 
    } 

//==== playSong() ======== 
    public void playSong(int songIndex){ 
     // Play song 

     songList = songManager.getPlayList(this); 
     try { 
      mp.reset(); 
      mp.setDataSource(songList.get(songIndex).get("songPath")); 
      mp.prepare(); 
      mp.start(); 
      // Displaying Song title 
      String songTitle = songList.get(songIndex).get("songTitle"); 



     } catch (IllegalArgumentException e) { 
      e.printStackTrace(); 
     } catch (IllegalStateException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    }// == End of playSong() === 


private class AudioPlayerBroadcastReceiver extends BroadcastReceiver { 
    @Override 
    public void onReceive(Context context, Intent intent) { 
     String action = intent.getAction(); 
     currentSongIndex = intent.getExtras().getInt("songIndex"); 


     if(PLAY_SONG.equals(action)) { 
      playSong(currentSongIndex); 
     } 

     } 
    } 

} 

Answer 1

的问题是最有可能是你要绑定到Service但是当你点击一个列表项，你打电话finish()这将终止Activity。代码中没有任何内容显示您从Service解除绑定。

看来你不仅混淆了这个问题，而且不仅启动Service，而且绑定它并且还使用BroadcastReceiver。绑定到Service的目的是允许（例如）Activity和Service之间的直接通信，在这种情况下，不需要通过BroadcastReceiver进行通信。

最重要的方面是，如果你绑定到一个Service，确保你从它在任何onPause()，onStop()或onDestroy()根据要求解除绑定。