CrazyAndroid: Create LinkTestActivity
Most functions of this LinkTestActivity is come from apidemo of
android release, all functions include: http, https, email, rtsp,
dial links in this activity.
CrazyAndroid: three types to track data change
Observer Pattern was described as an watcher of high level data
change notify mechanism, there are three ways to track data change
from APP to service.
1. implement the service listener.
2. send intent from service.
3. implement java.util.observer class.
CrazyAndroid: inflate view with different layout

Add ViewStub in either empty or not empty RelativeLayout, check
the actual display after inflate ImageView.
Merge branch 'dev-no-amend' of https://github.com/rongguowang/CrazyAndroid into dev-apue
APUE: EXIT procedures.

Some basic operation during exit process.
Merge branch 'dev-apue' of https://github.com/rongguowang/CrazyAndroid into dev-apue