UNDERSTANDING THE COMPONENTS OF A SCREEN
Views and ViewGroups
LinearLayout
AbsoluteLayout
TableLayout
RelativeLayout
FrameLayout
ScrollView
ADAPTING TO DISPLAY ORIENTATION
Anchoring Views
Resizing and Repositioning
MANAGING CHANGES TO SCREEN ORIENTATION
Persisting State Information during Changes in Configuration
Detecting Orientation Changes
Controlling the Orientation of the Activity
UTILIZING THE ACTION BAR
Adding Action Items to the Action Bar
Customizing the Action Items and Application Icon
CREATING THE USER INTERFACE PROGRAMMATICALLY
LISTENING FOR UI NOTIFICATIONS
Overriding Methods Defined in an Activity
Registering Events for Views
android chapter:3 SUMMARY