Build and install a go library for android studio

golang_android.md

Build and install a go library for android studio

Setup

• install the android ndk: https://developer.android.com/studio/projects/install-ndk
• install java 11:

brew tap homebrew/cask-versions
brew install --cask temurin11

Create a go package

mkdir demo
cd demo
go mod init github.com/fdelbos/demo

Import in Android Studio

In this package create a demo.go file with the following:

package demo

type (
	Demo interface {
		Hello(string) string
	}

	srv struct{}
)

func NewDemo() Demo {
	return &srv{}
}

func (s *srv) Hello(name string) string {
	return "Hello " + name
}

Build a jar

• get the mobile tooling: go get golang.org/x/mobile/bind
• build:

mkdir -p build && \
gomobile bind \
  -o build/demo.aar \
  -target=android \
  -androidapi 30 \
  github.com/fdelbos/demo

You should get the following:

ls -lah build/
total 5
drwxr-xr-x  4 fred  staff   128B Apr 20 12:39 .
drwxr-xr-x  6 fred  staff   192B Apr 20 12:39 ..
-rw-r--r--  1 fred  staff   5.7K Apr 20 12:39 demo-sources.jar
-rw-r--r--  1 fred  staff   4.8M Apr 20 12:39 demo.aar

Import in Android Studio

• Add the dependency in the ** app / libs ** folder

• In an existing project, click on: File > Project Structure > Dependencies

• set the AAR path

• In Graddle you should have a new line for your dependency:

Enjoy

• Now you can update your code to use the new library:

• Check on the emulator