(Video introduction. This video tutorial was carefully recorded from the beginning by Li Huoming at the end of 2011 for the original Android core basic course of Smart Podcast. It is more complete and detailed than the previous Android course, but it does not include the Android core basic strengthening and Android project actual combat content of the 3G Android office class of Smart Podcast for more than two months. Because there are more and more Android developers, the starting salary of Android developers has dropped, and software enterprises have increasingly high technical requirements for Android developers)