(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 general hardware 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 messy problems encountered in development. Android Technology Insights: System Volume is divided into two volumes. The system volume mainly analyzes the underlying principles and implementation details of each module of the Linux kernel layer, hardware general layer and system runtime layer; The usage volume mainly analyzes the underlying principles and implementation details of each module of the usage layer and the framework layer. This document includes the following annexes:)