(This file exceeds the upload limit. Please download the txt text, which is the download address of Baidu online disk. It can be downloaded without deduction. According to the introduction of Introduction to Android Development and Practical Experience compiled by Li Zuobin, the arrival of the 3G era has made it possible to deploy more content rich applications on mobile phones, such as video calling, video on demand, mobile Internet surfing, online reading/listening to music, content sharing, etc. In order to achieve these requirements, the requirements are supported by a good mobile development platform. This document includes the following annexes:)