Question

我再次向你求助于我提出的一个问题。我有一个扩展类服务的类，并实现了Runnable类用于音频播放，我正在使用进度条来显示音乐再现的进度。在run方法中添加代码以更新进度条的值，就在那里，但是当我正在播放一首歌并跳转到另一首歌而没有完成前一个时，之前创建的线程不会被破坏，请帮助我请？

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);
    }
}

}

Answer 1

在正常情况下，线程不会被“破坏”，它们在运行方法return时结束。这可以通过例如布尔标志或通过调用interrupt()（线程外部）并定期检查线程中的Thread.interrupted()。

进度条中的“销毁”线程

1 个答案: