title: Android startActivity vs HOME Button
body: <p>I have a mainactivity. In the AndroidManifest I have declared. </p>
  
  <pre><code>android:clearTaskOnLaunch="true"
  </code></pre>
  
  <p>This should bring me to this activity, every time the app is ended with the HOME Button and call onRestart() then, right?</p>
  
  <p>Furthermore my mainactivity starts some other activitys by using</p>
  
  <pre><code>startActivity(...)
  </code></pre>
  
  <p>after calling this, mainactivity goes to onStop() and if i press Back in the ChildActivity, the mainactivity goes in onRestart(..).
  Is there no chance to decide in my mainactivity whether the User pressed back on a ChildActivity or pressed home?</p>