title: android black screen when back button is pressed
body: <p>I would like to avoid the black screen between activities when the back button is pressed.</p>
  
  <p>If I kill an activity with killProcess I obtain the same result.</p>
  
  <pre><code>android.os.Process.killProcess(android.os.Process.myPid());
  </code></pre>
  
  <p>I would prefer not to have to use AsyncTask. I call the activity through an intent in an activityforresult.</p>