CODEWITHSUNDEEP
javaandroidhandler
jeet.chanchawat
jeet.chanchawat

Reputation: 33

How to Stop Recursive Call Of Handler?

I created a handler, to imitate timer task. because TimerTask was acting differently on different tablets. so I created this handler method. in timer there was a method timerTask.cancel(); but how to stop this handler it keeps on running even after the application is exited. as you can see logs running even after back press.

Handler handler = new Handler();

public void recursivelycallHandler(){
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {

            Log.d("handler is running", "true" + System.currentTimeMillis());
            recursivelycallHandler();

        }
    }, 100);
}

Upvotes: 3

Views: 3710

Answers (5)

baboo
baboo

Reputation: 2023

There are 3 methods to do that .. 

handler.removeCallbacks(Runnable r);
handler.removeCallbacksAndMessages(null);
handler.removeMessages(int what)

In your case first two seem feasible .. add any of the above method in ondestroy or on a listener to backpress..

Upvotes: 3

Pratik
Pratik

Reputation: 30855

By putting any condition

Handler handler = new Handler();
int i = 0;
Runnable myRunnable = new Runnable() {
        @Override
        public void run() {

            Log.d("handler is running", "true" + System.currentTimeMillis());
            if(i>5)
               handler.removeCallback(myRunnable);
            else{
                i++;
                handler.postDelayed(myRunnable, 100); // here is self calling
            }

        }
    };
}
handler.postDelayed(myRunnable, 100);

Its recursive method but you can call the same Runnable object in run() instead of recursive method and remove that object when based on specific situation/condition

Upvotes: 1

Mr.Me
Mr.Me

Reputation: 9276

just add isFinished to your run method:

    handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        if (isFinished())
               return;
        Log.d("handler is running", "true" + System.currentTimeMillis());
        recursivelycallHandler();

    }
}, 100);

Upvotes: 0

Shreyash Mahajan
Shreyash Mahajan

Reputation: 23596

you can do something like this below:

   public void recursivelycallHandler(){
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {

            Log.d("handler is running", "true" + System.currentTimeMillis());
            if(YOUR_CONDITION){
               recursivelycallHandler();
            }

        }
    }, 100);
}

Hope you got my point.

feel free to comment.

Upvotes: 0

dilix
dilix

Reputation: 3893

You can store flag (boolean var) to detect if you need to call for your handler and before exit app change this flag to false and stop calling handler.

Upvotes: 0

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