Book Image

Android System Programming

By : Roger Ye, Shen Liu
Book Image

Android System Programming

By: Roger Ye, Shen Liu

Overview of this book

Android system programming involves both hardware and software knowledge to work on system level programming. The developers need to use various techniques to debug the different components in the target devices. With all the challenges, you usually have a deep learning curve to master relevant knowledge in this area. This book will not only give you the key knowledge you need to understand Android system programming, but will also prepare you as you get hands-on with projects and gain debugging skills that you can use in your future projects. You will start by exploring the basic setup of AOSP, and building and testing an emulator image. In the first project, you will learn how to customize and extend the Android emulator. Then you’ll move on to the real challenge—building your own Android system on VirtualBox. You’ll see how to debug the init process, resolve the bootloader issue, and enable various hardware interfaces. When you have a complete system, you will learn how to patch and upgrade it through recovery. Throughout the book, you will get to know useful tips on how to integrate and reuse existing open source projects such as LineageOS (CyanogenMod), Android-x86, Xposed, and GApps in your own system.
Table of Contents (15 chapters)

Introducing Recovery

In this book, we have completed two projects so far. With the first x86emu project, we learnt how to extend an existing device to support additional features. After that, we learnt how to create a new device using the second project, x86vbox. There is another important topic at the system-level programming of Android, which is how to patch or update a released system.

In Android systems, the way to patch or update a released system is using a tool called recovery. In the next three chapters, we will learn how to build recovery on an x86vbox device. Since x86vbox is a built for VirtualBox, we will use VirtualBox as virtual hardware for this chapter to Chapter 14, Creating OTA Update Packages. We will also prepare and test a few update packages using the recovery that we build. In this chapter, we will cover the following topics:

  • Recovery introduction
  • Analyzing recovery source code
  • Building recovery...