yes i would recommend that you get to know more Java before you start android development. There will probably be some stuff in android that you dont know and android will not teach you cause you should already know from learning java. Also you should not do game programming first cause it will be a lot harder to do, you should do regular apps first. i would also recommend that you do game development in java(not in android) first so you get the basics of game programming. Also when you create android apps you have to worry about a lot more. like doing the layouts in xml,inserting data in xml, using android tools in eclispe, and more but once you get it, it not that hard.Once you feel that you know more about java then try android.