Android application development. I think I have touched almost all area of android application programming from And I am also developing games with native language and cocos2d-x. My Android device list: Samsung Galaxy S 2 / 3 / 4 / 5, Galaxy Note 2 / 3 / 4, Galaxy Tab, Google Nexus, ASUS Tablet with all versions of Android OS (from Gingerbread to LolliPop)