(The course posted above has errors in the upload process. The information is incomplete. I can't modify it here. I have to upload a copy from the beginning. Please pay attention to the title when downloading. The information is a book, not source code. The introduction is pretty good. If you are interested, you can have a look- This tutorial description and copyright statement: Dahua Enterprise Android Development is a book compiled by Guoshi Office to facilitate Android developers in China and promote the development of Android enterprise use. It is published on the network for free, hoping to contribute to the era of mobile Internet and smart phones! The copyright of all relevant documents belongs to Guoshi Office. This tutorial is an original work by the Guoshi Office referring to official documents, integrating relevant books of the city road, through full absorption and digestion, combined with the development practice. In order to meet and share this tutorial with the majority of readers as early as possible, we hereby adopt the serial method of publishing part of the final version as soon as possible. Readers can get the latest content in this blog.)