应用程序从前台到后台时如何停止处理程序

Question

我在onresume方法中调用了handler方法，它是重复的任务，每20秒重复一次，然后当应用程序进入后台时，我调用处理程序方法removecallbacks（null）来阻止它。但它不能正常工作... < / p>

@Override
protected void onPause() {
    super.onPause();
    handler.removeCallbacks(null);
}
@Override
protected void onResume() {     
    super.onResume();
    //new AsynchHttpDownload(true,this, "GetReviewsNew",  2, ReviewsActivity.this).execute();

    customHandler = new android.os.Handler();

   //   customHandler.notify();  

    isRunAlways=true;
    runAnimation=true;
    if((runThread==null)||(runThread!=null&&!runThread.isAlive())){
        runThread=new Thread(thread);
        runThread.start();
    }

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

    TimTask();
}


public void TimTask()
  {

    customHandler.postDelayed(updateTimerThread,20000);
   // 
   }

    public Runnable updateTimerThread = new Runnable()
    {

          public void run()
          { 
              Log.d("Repeat Tag","Repeat after 20 sec");
            //  spin.setVisibility((View.VISIBLE));
              new GetSizeFromUpdateReviews().execute();
              customHandler.postDelayed(this, 20000);

          }
    };

Answer 1

试

handler.removeCallbacks(updateTimerThread);

而不是

handler.removeCallbacks(null);