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如果我启用每秒刷新线程，我制作了一个音乐播放器，每次尝试关闭它时都会崩溃（刷新是为了更新歌曲的经过时间和进度条）。这是代码：

/**
 * Background Runnable thread
 * */
private Runnable mUpdateTimeTask = new Runnable() {
       public void run() {
           long totalDuration = mp.getDuration();
           long currentDuration = mp.getCurrentPosition();

           // Displaying Total Duration time
           songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration));
           // Displaying time completed playing
           songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration));

           // Updating progress bar
           int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
           //Log.d("Progress", ""+progress);
           songProgressBar.setProgress(progress);

           // Running this thread after 100 milliseconds
           mHandler.postDelayed(this, 100); //this line is causing errors
       }
    };

这一切都在活动中再次起作用，但是一旦我按下后退按钮，它就会崩溃。有任何想法吗？谢谢

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1 回答 1

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Try stopping the future callbacks with removeCallbacks() in onPause() or a similar method:

mHandler.removeCallbacks(mUpdateTimeTask);

if I enable refreshing the thread every sec

You seem to want to run your code once a second, but you use...

// Running this thread after 100 milliseconds
mHandler.postDelayed(this, 100); //this line is causing errors

Understand that Handlers and Runnables are not created in a new Thread by default and that a 100 millisecond delay executes your code 10 times a second.

于 2012-12-28T21:38:48.853 回答