如何停止计时器的Andr​​oid [英] How to Stop Timer Android

问题描述

以下是我的code：

在MainActivity.class

In MainActivity.class

private OnCheckedChangeListener alert_on_off_listener = new OnCheckedChangeListener(){
    public void onCheckedChanged(RadioGroup groupname, int CheckedButtonId) {

         if(CheckedButtonId==R.id.radiobutton_on){
             Toast.makeText(getApplicationContext(), "radio on", Toast.LENGTH_LONG).show();
             alert_on = true;
             display_alert();    
         }
         else{
             alert_on = false;
         }   
    }
};

public void display_alert(){

    int delay = 10000;  
    Timer timer =new Timer();
    timer.scheduleAtFixedRate(new TimerTask()
    {
        public void run() 
            {
                Intent myIntent = new Intent(HoraWatchActivity.this,MyService.class);
                startService(myIntent);
            }
    }, delay,10000);
}

MyService.class

MyService.class

@Override
public void onStart(Intent intent, int startId) {
    super.onStart(intent, startId);
    if(MainActivity.alert_on)
       Toast.makeText(getApplicationContext(), "Alert is On", Toast.LENGTH_LONG).show();
    else
       Toast.makeText(getApplicationContext(), "Alert is Off",Toast.LENGTH_LONG).show();
}

我检查 onCheckedChangeListener 并调用 display_alert 根据检查单选按钮的功能。

I am checking the onCheckedChangeListener and calling display_alert function according to the checked radio button.

在 display_alert 我是用定时器调度以10秒的固定利率，并要求为MyService 类的功能。

In display_alert function I was using timer scheduling at fixed rate of 10 seconds and calling myservice class.

所以，当我检查了 radio_on 按钮，它会调用我的 display_aler T功能，并得到了警惕的在致祝酒辞。因此，它做工精细。

So once I checked the radio_on button, it calls my display_alert function and got the "alert on" in toast. So its working fine.

如果我再次检查 radio_off 按钮，然后选中 radio_on 按钮，我收到了警惕的敬酒，但敬酒来了两次。同样的，如果我再次选择 radio_on 按钮，面包显示第三次，但我只需要一次。这是由于该定时器正在运行，每10秒。我想停止计时，一旦我点击 radio_off 按钮。

If I again check radio_off button and then check the radio_on button, I am getting the "alert on" toast, but the toast is coming twice. Similarly if I again select the radio_on button, the toast is displaying for the third time, but I need only once. This was due to that the timer is running for every 10 seconds. I want to stop the timer once I click the radio_off button.

问题是，一旦我开始计时，我没有再阻止它。当我应如何取消我的课定时任务？

The problem is, once I started the timer, I was not stopping it further. When and how shall I cancel the timer tasks in my class?

推荐答案

首先，在一个独立的方式创建您的TimerTask：

First, create your TimerTask on a separate way:

class MyTimerTask extends TimerTask {
  public void run() {
    Intent myIntent = new Intent(HoraWatchActivity.this,MyService.class);
    startService(myIntent);
  }
}

声明它的地方，当然看得见你OnCheckedChangeListener：

Declare it somewhere, of course visible to your OnCheckedChangeListener:

MyTimerTask myTimerTask;

安排的：

public void display_alert() {
  int delay = 10000;  
  myTimerTask = new MyTimerTask();
  Timer timer = new Timer();
  timer.scheduleAtFixedRate(myTimerTask, delay, 10000);
}

然后修改code为：

And then modify your code to:

private OnCheckedChangeListener alert_on_off_listener = new OnCheckedChangeListener(){
public void onCheckedChanged(RadioGroup groupname, int CheckedButtonId) {

     if(CheckedButtonId==R.id.radiobutton_on){
         Toast.makeText(getApplicationContext(), "radio on", Toast.LENGTH_LONG).show();
         alert_on = true;
         display_alert();    
     }
     else{
         myTimerTask.cancel();
         alert_on = false;
     }   
}
};

这篇关于如何停止计时器的Andr​​oid的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！