title: How to make a countdown timer in Android?
body: <p>I have two EditTexts in XML. In one EditText, the user can put a number as minutes and in another EditText, a number as seconds. After clicking the finish button, the seconds EditText should start to countdown and update its text every second. </p>
  
  <p>Additionally, how can I keep it updating until it gets to zero minutes and zero seconds?</p>