Question

为什么这不起作用？我有activityClass（PlayListActivity.java）和serviceClass（AudioService.java）。当我点击ListView时，歌曲应该开始播放，但事实并非如此。当我点击ListView时，它会关闭应用程序而不会出现任何错误（例如forced close）。

我在LogCat中遇到了这个错误：

活动com.example.serviceaudio.PlayListActivity泄露了最初绑定的ServiceConnection com.example.serviceaudio.PlayListActivity$AudioPlayerServiceConnection@41b1c448

致命的例外：马宁 java.lang.RunTimeException：接收广播的错误Intent {act=com.example.serviceaudio.AudioService$AudioPlayerBroadCastResiever@41bdf88

以下是我的代码：

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

问题很可能是您绑定到Service但是当您点击列表项时，您正在调用finish()，这将终止Activity 1}}。您的代码中没有任何内容可以显示您从Service解除绑定。

您似乎不仅因为启动Service而是绑定它并使用BroadcastReceiver而混淆了这个问题。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，通过BroadcastReceiver进行通信。必要的。

最重要的方面是，如果您绑定到Service，请确保根据要求在onPause()，onStop()或onDestroy()取消绑定。

BroadCast接收器错误

1 个答案: