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)

Customizing and Debugging Recovery

In the last chapter, we created an OTA package for our x86vbox device. We also improved the recovery to remove all dependencies from the Android system so that it becomes a self-contained environment. We can run recovery and update the system using the OTA package we created. After the system is updated, we cannot use a two stages boot since the system becomes a standard Android system image layout.

In this chapter, we will enhance both recovery and the updater to support both standard and two stages boot using one system image. We will also enhance recovery to resolve one issue that we haven't talked about, which is how we pick up the OTA package in the recovery environment. In this chapter, we will cover the following topics:

  • Introducing the Android native application debug skill, which we can use to debug both recovery and the updater
  • Extending recovery and the updater...