(Dear garden friends, we are the Guoshi Office (Android). In the process of learning Android and developing projects, we have some insights and ideas. We have collected and compiled some learning materials. The original is only used for internal learning. But in order to facilitate more Android developers and promote the development of Android enterprise use, we decided to collect it into a tutorial and release it on the network for free, I hope to contribute to the era of mobile Internet and smart phones! This document includes the following annexes:)