CODEWITHSUNDEEP
javaandroid
Uday
Uday

Reputation: 1719

How to make timer to execute some function repeatedly & stop when the app is closed or back button is pressed

I'm trying to execute some function repeatedly for every 5 sec & it's working fine.

I wanted this timer to stop when the app is closed or back button is pressed.

  int delay = 0; 
        int period = 5000; // repeat every sec.
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            public void run() {
                System.out.println("done");
            }
        }, delay, period);
    }

Upvotes: 0

Views: 198

Answers (2)

Akbun
Akbun

Reputation: 13

In Android you can override below methods to identify the back press and activity close, then you can have the code to cancel the timer. 1. onDestroy() 2. onBackPressed()

In method implementation you can use below statements to stop. timer.cancel(); timer.purge();

ex:

  @Override
    public void onBackPressed() {
    timer.cancel();
    timer.purge();
    super.onBackPressed();
    }

I guess this would help..

Upvotes: 1

Rarw
Rarw

Reputation: 7663

Don't use a Timer just use a Handler

private boolean keepLooping = true;
private static final int DELAY = 1000 * 5;
final Handler printHandler = new Handler();
Runnable printStuff = new Runnable(){

     @Override
     public void run(){
         System.out.println("done");
         if(keepLooping)
             printHandler.postDelayed(this, DELAY);
     }

}

//wherever you want to start your printing
printHandler.postDelayed(printStuff, DELAY);
keepLooping = true;


//when back is pressed or app is stopped
keepLooping = false;
printHandler.removeCallbacks(printStuff);

postDelayed will run the runnable on the delay you want. If you want it to loop forever just start the handler again from within the runnable. When you want it to stop just removeCallbacks which will prevent the looping.

Upvotes: 3

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