title: How to display a timer in a TextView in Android?
body: <p>I want to set this textview:</p>
  
  <pre><code>&lt;TextView
      android:id="@+id/timer"
      android:layout_width="100dp"
      android:layout_height="30dp"
      android:layout_above="@+id/directions"/&gt;
  </code></pre>
  
  <p>To be a timer.  So the text should be a timer going like 0:30 then 0:29 ... for 30 seconds.  Once timer is 0:00, I can call another method; I can print out "try again" and restart timer.</p>