(Android System Level In depth Development: Migration and Debugging is a book that introduces Android system level development. Migration and debugging are the key points of the book. Android has a huge software system, and it is difficult for any developer to master every detail of the system. Therefore, how to efficiently understand and develop the system has become the primary problem faced by Android system level engineers. The author of this book realizes this book based on practical development experience and under the guidance of software engineering ideas. This book introduces the primary work from the Android open source project to a practice based hardware product. On the one hand, it enables readers to clearly grasp the architecture of each subsystem, and on the other hand, it enables readers to grasp the key to the core development link of transplantation. Readers)