title: It will be black screen on app start if the apk has been signed
body: <p>My app works fine in debug mode but if I build a signed apk with the same code it will be black screen when it opens.</p>
  
  <p>This situation only appeard in android 4.0.3/samsung Galaxy II
  and 2.3.X with the same phone has no problem.</p>
  
  <p>Why? How to fix it?</p>