Add image for dialog and preference
Fix preference callback sample
Add advanced 3rd practice and assignment project
Fix fragment inner class  is static
Add practice session for dialog
Fix defaultValue of ListPreference
add test application of android
submit report for 1.04
solve to FrameLayout-Practice1
solve FrameLayoutPractice2
solve ScrollViewPractice1
solve LayoutAssignment1
solve LayoutAssignment2_1
solve LayoutAssignment2_2
solve LayoutAssignment3 temporary
solve LayoutAssignment3 final
fix compile error
solve ActivityPractice1
solve FragmentPractice1
solve ControllerAssignment1