Debug and test
1,unable resolve ActionBarWindow? Need refer to V7 lib.refer to
http://stackoverflow.com/questions/17870881/cant-find-theme-appcompat-light-for-new-android-actionbar-support
2,MainActivity need theme @style/Theme.AppCompat....
3,PreferenceFragment cannot cast to android.app.support.v4.Fragment, change to Fragment
4,add Action Items,and set setting action.
5,suit up all the codes