title: CountDownTimer updating and blocking
body: <p>If understand CountDownTimer correctly, it doesn't run on a separate thread from the activity that started it. So does that mean if I start a CountDownTimer in my main activity, and another piece of code later blocks in the activity, does this mean the CountDownTimer will no longer update as the thread is tied up?</p>
  
  <p>and if so, would the CountDownTimer attached to the main activity also stop updating if I launch a second activity?</p>