("Deeply Understanding Android: Volume 2" is the second book in the "Deeply Understanding Android" series. The first book was highly praised by the majority of readers after it was launched, and it was passed on by word of mouth in the Android developer community. Deeply Understanding Android: Volume 2 not only inherits the advantages of the first book and corrects some shortcomings in its subtleties, but also makes innovations in the overall idea of writing, and focuses on analyzing the implementation principle and office mechanism within each module of the Android system from the perspective of the system designer. In terms of specific content, the focus is on the Java layer of the Android Framework, and the core modules and services involved in the Java layer are analyzed in depth and detail. Through In depth Understanding Android: Volume 2, readers can not only have a deeper understanding of the Android system itself, but also master the ability to analyze large and complex source code.)