title: Android: Who start Activity
body: <p>I have 3 activity: Activity1, Activity2, Activity3. Activity1 and Activity3 can start Activity2: </p>
  
  <blockquote>
    <p>startActivity (new Intent(this,Activity2));</p>
  </blockquote>
  
  <p>How in Activity2 I can check which class start Activity2 ? Is there any way to take information from Intent ? Thanks...</p>
  
  <p>I dont whant to put anything in Intent. I think I dont need that. When I start intent I already saying from what context I do that (new Intent(<code>*this*</code>,Activity2)). And this "this" I want to recognize in Activity2 !!! Is that possible ?</p>