title: Add a certain amount of time to a current time and write it
body: <p>I'm using:</p>
  
  <pre><code>Calendar c = Calendar.getInstance();
  </code></pre>
  
  <p>with which i get a current time,</p>
  
  <pre><code>String sHour = c.get(Calendar.HOUR_OF_DAY)
  String sMinute = c.get(Calendar.MINUTE)
  </code></pre>
  
  <p>What i need is to add e.g. 1 Hour 10 Minutes - store it in a variable and also Substract let's say 10 minutes and save that as an another variable. (I need to use them both in a <code>TextView</code>)</p>
  
  <p>I've seen the <code>add();</code> method in Android documentation but I can't seem to understand how it works.&nbsp;Thanks</p>