如何在特定次数后停止计时器

问题描述：

试图使用Timer以每次10秒的间隔运行4次。如何在特定次数后停止计时器

我试图用一个循环停止它，但它不断崩溃。已尝试使用带有三个参数的schedule()，但我不知道在哪里实现计数器变量。有任何想法吗？

final Handler handler = new Handler(); 
Timer timer2 = new Timer(); 

TimerTask testing = new TimerTask() { 
    public void run() { 
     handler.post(new Runnable() { 
      public void run() { 
       Toast.makeText(MainActivity.this, "test", 
        Toast.LENGTH_SHORT).show(); 

      } 
     }); 
    } 
}; 

int DELAY = 10000; 
for (int i = 0; i != 2 ;i++) { 
    timer2.schedule(testing, DELAY); 
    timer2.cancel(); 
    timer2.purge(); 
}

答

private final static int DELAY = 10000; 
private final Handler handler = new Handler(); 
private final Timer timer = new Timer(); 
private final TimerTask task = new TimerTask() { 
    private int counter = 0; 
    public void run() { 
     handler.post(new Runnable() { 
      public void run() { 
       Toast.makeText(MainActivity.this, "test", Toast.LENGTH_SHORT).show(); 
      } 
     }); 
     if(++counter == 4) { 
      timer.cancel(); 
     } 
    } 
}; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    timer.schedule(task, DELAY, DELAY); 
}

谢谢，这个答案是最有意义 – jimmyC 2012-07-16 00:14:15

没问题。然后将其标记为正确答案:) – Y2i 2012-07-16 01:53:34

答

为什么不使用AsyncTask，只是有它的Thread.sleep（10000），并在一段时间循环的publishProgress？下面是它会是什么样子：

new AsyncTask<Void, Void, Void>() { 

     @Override 
     protected Void doInBackground(Void... params) { 

      int i = 0; 
      while(i < 4) { 
       Thread.sleep(10000); 
       //Publish because onProgressUpdate runs on the UIThread 
       publishProgress(); 
       i++; 
      } 

      // TODO Auto-generated method stub 
      return null; 
     } 
     @Override 
     protected void onProgressUpdate(Void... values) { 
      super.onProgressUpdate(values); 
      //This is run on the UIThread and will actually Toast... Or update a View if you need it to! 
      Toast.makeText(MainActivity.this, "test", Toast.LENGTH_SHORT).show(); 
     } 

    }.execute();

另外，作为一个侧面说明，对于较长期的重复性任务，可以考虑使用AlarmManager ...

答

for(int i = 0 ;i<4 ; i++){ 
    Runnable runnableforadd ; 
    Handler handlerforadd ; 
    handlerforadd = new Handler(); 
    runnableforadd = new Runnable() { 
     @Override 
     public void run() { 
      //Your Code Here 
      handlerforadd.postDelayed(runnableforadd, 10000);       } 
    }; 
    handlerforadd.postDelayed(runnableforadd, i); 

}

如何在特定次数后停止计时器

相关推荐