Using Paypal API in Android

Push Notification in Android

Support multi-languages in android application

Support multi-screen in android

Advance Service in android

Integrated Tabjoy in Android

Barcode and QR code in android

Communication between many processes in android

Using Observer Pattern in Android

Using CallBack Pattern in Android

Using Listener Pattern in Android

Integrated Facebook SDK, Twitter SDK in Android

Using Fragment & ViewPager in TabHost to swipe between Screen

Support Tablet and Handset in Android