(Today, mobile development is in full swing. Android has a broad development business and is currently the smartphone operating system with the highest business share. There are 110 high-quality Android development materials collected in this document. There are many materials on the Internet, both good and bad. However, these materials are carefully collected, with high downloads and many favorable comments. These are very classic materials. Some of them are not needed for the time being. You can collect them as development directories and download them when you need them. This document includes the following annexes:)