(The Inside Story of Android Technology: System Volume is the first work in China to conduct in-depth analysis of Android source code. The whole book divides the Android system into five layers from the perspective of architecture: the use layer, the use framework layer, the system runtime layer, the hardware abstraction layer, and the Linux kernel layer. It aims to help developers deepen their understanding of the architecture design and implementation principles of the Android system through any analysis of the source code of the Android system, and then help them manage the increasingly complex problems encountered in development. This document includes the following annexes:)