title: Android FragmentActivity finish close twice
body: <p>I have a FragmentActivity and add fragment as below,</p>
  
  <pre><code>    FragmentTransaction ft = fm.beginTransaction();
      ft.add(R.id.main_fragment_container, mFragment, mTag);
      ft.commit();
  </code></pre>
  
  <p>but when call activity finish(), The activity close as normal, so far so good, but after that the fragment show again and close. it's so fast that it's hard to see on some device (Nexus 4). but in Galaxy S3, it's obvious to see it flash and disappear. does anyone have the same problem?</p>