title: How to measure elapsed time
body: <p>I have a 10 and 20 question game. I need to count how much time is passed when a user finishes the game.</p>
  
  <pre><code>Timer T=new Timer();
  T.scheduleAtFixedRate(new TimerTask() {         
      @Override
      public void run() {
          runOnUiThread(new Runnable()
          {                
              public void run()
              {
                  countdown.setText(""+count);
                  count++;                
              }
          });
      }
  }, 1000, 1000);
  </code></pre>
  
  <p>I use this to stop the counter:</p>
  
  <pre><code>T.cancel();
  </code></pre>
  
  <p>Now I need two things:</p>
  
  <ul>
  <li>A way how to count the elapsed time and store it in a variable</li>
  <li>I need the final value to be a double, for example final score is: 15.49 seconds. </li>
  </ul>