title: How to restore previous activity after pressed home button and return to the app
body: <p>the flow is like below.</p>
  
  <ul>
  <li>MainActivity -> Second Activity</li>
  <li>Press home key then device main screen shown.</li>
  <li>Enter to app box and click the application icon.</li>
  </ul>
  
  <p>I expect the second activity should be launched but main activity launched.</p>
  
  <p>is there any way that I control it -?!</p>