title: Overlay an activity on another activity OR overlay a view over another
body: <p>I have 2 classes, FirstActivity and SecondActivity.</p>
  
  <p>First Activity</p>
  
  <pre><code>Intent intent=new Intent(getApplicationContext(),SecondActivity.class);
  startActivity(intent);
  </code></pre>
  
  <p>Is it possible for SecondActivity to overlay on FirstActivity? ie. FirstActivity gets dimmed, SecondActivity gets displayed on top of FirstActivity.</p>
  
  <p>If it is not possible for 2 different activities, is it possible to do an overlay for 2 views in the same activity? I hope using dialog is not the only option.</p>