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)

Preparing an OTA package for x86vbox

We have understood updater and the updater script inside an OTA package so far. We can build an OTA package for our x86vbox device now. To build an OTA package, we can use the following commands:

$ mkdir -p dist_output
$ make dist DIST_DIR=dist_output

The default OTA package build in Android 5 or above is to build the block-based OTA package, but we will get an error building block-based OTA packages for x86vbox. There are a lot more configurations that are needed to be done to support block-based OTA packages in our environment. All the third-party recovery packages cannot use block-based update packages as well.

To avoid this error, we need to change the following build/core/Makefile file to remove the --block option:

@echo "Package OTA: $@"
$(hide) PATH=$(foreach