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)

Booting a disk image on the Android emulator

Once we have done all the changes, we can build the qcow2 image using the following command:

$ make qcow2_img USE_SQUASHFS=0
make_ext4fs -T -1 -S out/target/product/x86emu/root/file_contexts -L
system -l 1342177280 -a system out/target/product/x86emu/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/x86emu/system out/target/product/x86emu/system

Creating filesystem with parameters:
Size: 1342177280
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 5120
Label: system
Blocks: 327680
Block groups: 10
Reserved block group size: 79
Created filesystem with 2122/81920 inodes and 178910/327680 blocks
Install system fs image: out/target/product/x86emu/system.img

As we can see from the preceding command-line output, system.img will be built as usual. After that, the ramdisk image,...