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)

Wi-Fi on Android

In Chapter 3, Discovering Kernel, HAL, and Virtual Hardware, we discussed the porting layers related to the Android system, we used goldfish lights as an example to depict the calling sequence from an application to HAL to access the hardware. We will use a similar approach in this chapter to explore the Wi-Fi architecture of Android. Based on what we understand about Wi-Fi architecture, we will add Wi-Fi to the emulator later in this chapter.

The Wi-Fi architecture

As we know from previous chapters, Android applications use managers to access system services. The managers will use various system services to access Hardware Abstraction Layer (HAL). The Wi-Fi architecture also follows the same approach for applications to access Wi-Fi hardware.