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)

Debugging the Boot Up Process Using a Customized ramdisk

In the last chapter, we learnt to enable Houdini in the Android emulator using our own x86emu device. With that, we can move on to more challenging tasks in the next few chapters. Most device- or system-level customization will involve changes to the Android system start up sequence. In this chapter, we will analyze the Android system start up sequence and learn the knowledge related to the customization and debugging of the start up sequence. In this chapter, we will cover the following topics:

  • Android start up process analysis
  • Starting up process for the Android-x86
  • Creating a filesystem for the Android-x86 initrd.img

We will start with the analysis of a normal Android boot up process. After that, we will introduce the Android-x86 two-stage boot up. We will build a filesystem for the Android emulator that can work with Android-x86 initrd.img. This method...