Get Started

When mentioning Android one should take into account that there are different versions, depending on the vender. However they all (most likely) have the same codebase which is AOSP. AOSP is the acronym for Android Open Source Project and enables one to compile an own Android version. Below ис а how-to guide of downloading the AOSP source code, building it and starting the emulator.

Installation

Described is building AOSP in the Linux distribution: Ubuntu Release 20.04
After installing Ubuntu please do the following steps, before downloading the source code and building it.

Update the package list from the repositores and get information on the newest packages and their dependencies.
sudo apt update

Install git version 2 (git will be used for fetching the source code from the repository).
sudo apt install git

sudo apt install m4

sudo apt-get install libncurses5

vi ~/.bashrc

PATH=~/bin:$PATH

source ~/.bashrc

sudo apt install curl

curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo

chmod a+x ~/bin/repo

Source code

creating a working directory

mkdir WORKING_DIRECTORY

cd WORKING_DIRECTORY

git config –global user.name “your name”

git config –global user.email “your email adress”

sudo ln -s /usr/bin/python3 /usr/bin/python

downloading code

Master branch

A particular branch: https://source.android.com/setup/start/build-numbers#source-code-tags-and-builds

repo init -u https://android.googlesource.com/platform/manifest -b android-10.0.0_r41

repo sync -j3

Compilation

source build/envsetup.sh

lunch aosp_arm-eng

m

Generate updates

Execution

When issuing the command emulator the default vuild will be executed.

If you wish to execute it on a device the these two devices:
Google Pixel 2

Google Pixel 2 XL

This is an example of code in GitHub pages:

@RestController
public class HelloController {

	@RequestMapping("/")
	public String index() {
		return "Hello to this app!";
	}
}