The Functional completeness and bug fix.

In this commit, there are several minor changes.
1. In About, the layout is changed to ListView instead of LinearLayout.
The function of each item is completed except for Detal and Share. Which
need the link to the Android market.
2. Fix somes bug
a. onLocationChanged is called too often
b. Fix the re-entry in Place Query
3. Add "more" in Place Query
Add detail of seletec place