Side notes on Android Dev
To make your subclassed ViewPager (android.support.v4.view.ViewPager) work, prepare both the constructors in your class: ViewPager(Context context) ViewPager(Context context, AttributeSet attrs) In ActionBarSherlock, if you can't get the loading icon work, i.e. setSupportProgressBarIndeterminateVisibility( ) just got no effect at all, then you are very likely have a wrong Window class (android.view.Window) imported. You should include the ActionBarSherlock Window class instead. com.actionbarsherlock.view.Window