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I want run timer for about 30000 ms and up to 8 or more times each so here is my loop but it runs all timers at once after 30000ms

 public void repeatTimerTask() 
 repeat = 8; // need to run 30 sec timer for 8 times but one after one

 startTimer(30000); // firsat timer for 30 sec

 Handler handler = new Handler();
 for (int a = 1; a<=repeat; a++) 

 final int finalA = a;
 handler.postDelayed(new Runnable() 

 @Override
 public void run() 
 startTimer(30000);

 

 , 30000); // delay until to finish first timer for 30 sec
 

To run a timer for n seconds you can use CountDownTimer

Declare two varibales globbaly. One for number of times you want to repeat. and one to keep the count of repetaion.

 private int NUM_REPEAT = 4;
 private int REPEAT_COUNT = 0;

Then call this method wherever you want. One thing to note if you want to run this loop 5 times you have to give number of repeation 4. Cause to satrt this function you have to call it so that will not come in count.

private void startTimer() 

 new CountDownTimer(3000, 1000) 
 int secondsLeft = 0;

 public void onTick(long ms) 
 if (Math.round((float) ms / 1000.0f) != secondsLeft) 
 secondsLeft = Math.round((float) ms / 1000.0f);
 // resend_timer is a textview
 resend_timer.setText("remaining time is "+secondsLeft);
 ;
 
 

 public void onFinish() 
 Log.d(TAG, "timer finished "+REPEAT_COUNT);
 if (REPEAT_COUNT <= NUM_REPEAT) 
 startTimer();
 REPEAT_COUNT++;
 

 
 .start();

Please try the below code, and call 'startTimer' method where you first want to start your timer :

private int startTimerCount = 1, repeat = 8;

private void startTimer()
 // if startTimerCount is less than 8 than the handle will be created
 if(startTimerCount <= repeat)
 // this will create a handler which invokes startTimer method after 30 seconds
 new Handler().postDelayed(new Runnable() 
 @Override
 public void run() 
 startTimer();
 
 , 30000);

 // do what you want
 Toast.makeText(this, "startTimer " + startTimerCount, Toast.LENGTH_SHORT).show();
 
 startTimerCount++;