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我再次向你提出一个我已经提出的问题。我有一个扩展类服务并实现类 Runnable 用于音频播放的类，我正在使用进度条来显示音乐再现的进度。在run方法中添加更新进度条值的代码，上面还可以，但是当我播放一首歌曲并没有完成上一首歌曲时跳转到另一首歌曲时，之前创建的线程没有被破坏，帮助我请？

public class PlaySongService extends Service implements MediaPlayer.OnCompletionListener, Runnable {

public static MediaPlayer mediaPlayer = new MediaPlayer();
private ProgressBar pbSong;
private final String TAG = "PlaySongService";

@Override
public IBinder onBind(Intent intent) {
    return null;  //To change body of implemented methods use File | Settings | File Templates.
}

public void onCreate() {
    mediaPlayer.setOnCompletionListener(this);
    mediaPlayer.reset();
    pbSong = new WeakReference<ProgressBar>(Main.pbSong);
    super.onCreate();

}

....... /* Selected song in listview*/

private void playSong(int position) {
    try {
            mediaPlayer.reset();
            mediaPlayer.setDataSource(my_file_selected_in_listview);
            mediaPlayer.prepare();
            mediaPlayer.start();
            pbSong.get().setProgress(0);
            pbSong.get().setMax(mediaPlayer.getDuration());
            new Thread(this).start();            
    } catch (Exception e) {
        Log.e(TAG,e.getMessage());
    }
}

@Override
public void run() {
    int currentPosition= 0;
    int total = mediaPlayer.getDuration();
    while (mediaPlayer!=null && currentPosition<total) {
        try {
            Thread.sleep(1000);
            currentPosition= mediaPlayer.getCurrentPosition();
            Log.i(TAG,Thread.currentThread().toString());
        } catch (InterruptedException e) {
            return;
        } catch (Exception e) {
            return;
        }
        pbSong.get().setProgress(currentPosition);
    }
}

}

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1 回答 1

0

线程在正常情况下不会被“销毁”，它们会在它们return从 run 方法中结束时结束。这可以通过例如一个布尔标志或通过调用interrupt()（在线程之外）和在线程中定期检查来Thread.interrupted()启动。

于 2013-05-27T21:34:37.717 回答