How to stop Handler Runnable?

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I am using a handler in the following program and I want to stop it when i=5 but the handler doesn't stop and run continuously.

   b1.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            handler = new Handler();
           runnable = new Runnable() {
                 public void run() {

                    try {
                        Toast.makeText(getApplicationContext(), "Handler is working", Toast.LENGTH_LONG).show();
                        System.out.print("Handler is working");

                       if(i==5){
                           //Thread.currentThread().interrupt();
                            handler.removeCallbacks(runnable);


                            System.out.print("ok");
                                        Toast.makeText(getApplicationContext(), "ok", Toast.LENGTH_LONG).show();
                        }
                       i++;
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } 
                   handler.postDelayed(this, 5000); 

               }
           };
           handler.postDelayed(runnable, 5000);
           //return;
        }
    });

Because you call postDelayed() again after removing call backs. Please use this code:

final Handler handler = new Handler();
final Runnable runnable = new Runnable() {
         public void run() {
               Log.d("Runnable","Handler is working");
               if(i == 5){ // just remove call backs
                    handler.removeCallbacks(this); 
                    Log.d("Runnable","ok");
                } else { // post again
                    i++;
                    handler.postDelayed(this, 5000); 
                }
       }
   };

//now somewhere in a method
 b1.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        handler.removeCallbacks(runnable); 
        handler.postDelayed(runnable, 5000); 
    }
});

Stop handler.postDelayed(), Declared before onCreate but you re-declared and then initialized it in onClick leading to a NPE. You can define a boolean and change it to false when you want to stop handler. How to stop Handler Runnable? Posted by: admin February 23, 2018 Leave a comment. Questions: I am using a handler in the following program and I want to stop it when


protected void onStop() {
    super.onStop();
    handler.removeCallbacks(runnable);
}

you can stop it like this

How to stop Handler in Android, You can use this to stop that runnable handler.removeCallbacks(​calendarUpdater);. removeCallbacks(Runnable r) :Remove any pending posts  Handler handler = new Handler() handler.postDelayed(new Runnable()) Or you can use: handler.removeCallbacksAndMessages(null); Docs. public final void removeCallbacksAndMessages (Object token) Added in API level 1 Remove any pending posts of callbacks and sent messages whose obj is token. If token is null, all callbacks and messages will be removed.


I found a solution which works for me. This is an example of code, where I expect a timer stop, but I saw it was alive, even if I was out of activity:

boolean bFlagForceExit = false; 
Handler timerHandler = new Handler();
private   Runnable timerRunnable = new Runnable() {
    @Override
    public void run() {

        if  (bFlagForceExit )
    MyProcessForExit(); 

        if (bSomeflagForRunAction)
            RunProcess();

        timerHandler.postDelayed(this, MILISEGUNDOS_ESPERA);        }
};


private void  MyProcessForExit()
{
    timerHandler.removeCallbacks(timerRunnable);
// close activity or whatever
finish();
}


private void  RunProcess()
{
   // action that i do when tick 
// time to leave or stop
bFlagForceExit = true;
}

Then I found that this works if removeCallbacks(timerRunnable) was called for other threads, so, I solved the problem like this.

boolean bFlagForceExit = false; 
Handler timerHandler = new Handler();
private   Runnable timerRunnable = new Runnable() {
    @Override
    public void run() {

        if  (bFlagForceExit )
        {
    // add a thred for run your stop handler
            new Thread(new Runnable() {
                public void run() {
                    SalirDeProceso();
                }
            }).start();
        }

        if (bSomeflagForRunAction)
            RUnProcess();

        timerHandler.postDelayed(this, MILISEGUNDOS_ESPERA);        }
};

Android, Example#. To stop the Handler from execution remove the callback attached to it using the runnable running inside it: Runnable my_runnable = new Runnable()  Final Handler handler = new Handler(); Runnable() { @Override public void run() { //Do something after 100ms Toast.Handlers are subclassed from the Android Handler class and can be used either by specifying a Runnable to be executed when required by the thread, or by overriding the handleMessage() callback method within the Handler subclass


Just saw this question. I would use CountDownTimer() instead. Run it for 5 seconds total and every second:

new CountDownTimer(5000, 1000) {
    public void onTick(long milsecRemain) {
        // Code to run every second
        Log.i("Seconds left", String.valueOf(milsecRemain/1000));
}
    public void onFinish() {
        // 10 seconds have passed
    }
}.start();

How to stop handler and runnable? : androiddev, I start this handler, when LiveData returns particular response.. However, I need to stop this handler in onPause, and resume it in onResume.. And I can't do that A Handler is simply a interface to the event loop of a thread. So if you stop the thread then you “stop” the Handler. assuming that your Handler is for a background thread. Here’s an example where quit () is designed to send a looper.quit () method to the event loop which will stop the thread and the Handler.


Handler / Stop handler from execution / Essential Android, Runnable my_runnable = new Runnable() { @Override public void run() { // your code here } }; public Handler handler = new Handler(); // use 'new  How to stop Handler Runnable? (3) I am using a handler in the following program and I want to stop it when i=5 but the handler doesn't stop and run continuously.


How to stop a running handler in Android, Handler handler = new Handler(); handler.postDelayed(new Runnable()). Or you can use: handler.removeCallbacksAndMessages(null);. Docs. public final void  So, Runnable can’t do anything by its own, means it needs to go with a Thread or a Handler. To describe about the relation and use of Message and Handler we need to know about Looper.


Handler, To stop the Handler from execution remove the callback attached to it using the runnable running inside it: You could rewrite the locking to use a lock object, so that you can handle this in the stop method You could make an application a single-use object, instantiating a new Application instead, making the whole restart-locking moot and everything a whole lot easier