(The fourth quarter of the series of Android courses: How to develop the use of Android quickly and efficiently - learn from the first three sessions of the comprehensive series of courses, and learn from them to inform you how to develop the use of Android quickly and efficiently, and quickly improve your ability to master Android development technology. Series of courses include: Android technology system and basic development technology - easy introduction/open/10.html (finished) Android multi-threaded usage and high-end skills - in-depth understanding/)