HAHAHAHAHAAA!!!!
1. I finally solve the appWidget no updating while exited the Activity problem
solved by: directly use SQLiteOpenHelper in the AppWidget
2. no updating immediately while staring app or the first time putting the AppWidget on the screen
solved by: add some update operation in onCreate() in the ListProvider (RemoteViewsFactory)

Signed-off-by: Greg Huang <greg65236592@yahoo.com>