I was using your demo on two different Android phones and have noticed a few bugs.
When the phone is in a vertical position, the change avatar and change cover photo only work sometimes. Turning the phone horizontal does seem to allow them to be changed at a better rate but still a bit buggy.
Also in the vertical position the Change cover photo menu falls behind the profile/avatar making it impossible to choose the other option. Example: http://i5.minus.com/in22obafyymd6.jpg
Any fixes for these things?