Cómo detener la serie de controladores postDelayed

En lugar de escribir la tarea Runnable de manera anónima debes definirla con un nombre, para que más tarde tengas un enlace a ella para eliminarla:

 //there is no need for multiple handlers //handler must be declared outside all functions, in order for you to use it everywhere. Handler handler = new Handler(); Runnable myFirstTask = new Runnable (){ @Override public void run() { plate1.setVisibility(ImageView.VISIBLE); plate2.setVisibility(ImageView.VISIBLE); plate3.setVisibility(ImageView.VISIBLE); } }; Runnable mySecondTask = new Runnable(){ @Override public void run() { plus1.setVisibility(TextView.VISIBLE); } }; Runnable myThirdTask = new Runnable(){ @Override public void run() { apples1.setVisibility(ImageView.VISIBLE); } } //you can put different tasks on the same handler object while (!lessonIsRunning) { handler.postDelayed(myFirstTask,6000); handler.postDelayed(mySecondTask,9250); handler.postDelayed(myThirdTask,9000); } public void stopLesson(View V){ //notice that you don't need these, because the handlers are not recursive //you don't have lines "handler.postDelayed(sameTask,someTime);" //in your run Method of the runnable if(handler!=null){ handler.removeCallbacks(myFirstTask); handler.removeCallbacks(mySecondTask); handler.removeCallbacks(myThirdTask); //if this method is inside onPause or onDestroy add this line as well: handler=null; } } 

puedes dar

 handler0.removeCallbacksAndMessages(null); handler1.removeCallbacksAndMessages(null); handler2.removeCallbacksAndMessages(null); 

un intento. El documento dice que cuando envía un token nulo se eliminan todas las devoluciones de llamada y el mensaje.