title: How to pause, and resume a TimerTask/ Timer
body: <p>I have an animation in my Android app that flashes a TextView different colors. I've used a TimerTask, Timer, and Runnable method to implement this. What I need to do is stop the thread when a user leaves the app during this animation in onPause(), and resume the thread when the user returns to the app in onResume(). The following is the code I've implemented, but it's not working (the onPause(), and onResume() pieces), and I don't understand why. I've read a few other posts on similar matters, but they haven't helped me figure out what to do in my situation. I've read that TimerTasks are outdated, and I should probably use an ExecutorService method; it is unclear to me as how to implement this function.</p>
  
  <pre><code>   ...timerStep5 = new TimerTask() {
  
          @Override
          public void run() {
              runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                  if (b5) {
                      cashButton2SignalText.setBackgroundColor(Color.RED);
                      cashButton2SignalText.setTextColor(Color.WHITE);
                      b5=false;
                  } else {
                      cashButton2SignalText.setBackgroundColor(Color.WHITE);
                      cashButton2SignalText.setTextColor(Color.RED);
                      b5=true;
                  }
                  }
              });
          }
  };
  
  timer5.schedule(timerStep5,250,250);
  
  }
  
  public void onPause(){
  
      super.onPause();
  
      timerStep5.cancel();
  
  }
  
  public void onResume(){
  
      super.onResume();
  
      timerStep5.run();
  
  }
  </code></pre>