title: Tell if Activity was started from launcher or navigated back to back button
body: <p>I'm trying to discern, during onStart(), whether my Activity was started from the home screen or "back" from another activity.</p>
  
  <pre><code>getIntent().hasCategory("android.intent.category.LAUNCHER")
  </code></pre>
  
  <p>does not work, as the activity's intent stays the same.</p>
  
  <p>I want to display a dialog box when the main activity starts, but I don't want it popping up every time a user goes back to the main activity after visiting another.</p>
  
  <p>Is there any way to accomplish this?</p>
  
  <p>Thanks for any help!
  -Chase</p>