Does go language support Android development?

The go language supports Android development; in 2014, the developers of the go language mentioned that the android platform would introduce go development. The GO language version 1.5 also released gomobile for the development of mobile applications. Gomobile is a tool for building and running mobile applications written in Go, and is a way of converting Go code bases into Android/iOS libraries.

The operating environment of this tutorial: Windows 7 system, GO version 1.18, Dell G3 computer.

About 2014, the developers of the go language mentioned that the android platform would introduce go development, and version 1.5 of the GO language also released go mobile

Gomobile

Gomobile is a tool for building and running mobile applications written in Go, and is a way to convert Go code libraries into Android/iOS libraries.

Compile Go Android Jar package

Preparation work:

• Download android-ndk. Website: https://developer.android.com/ndk/downloads

mkdir -p ${HOME}/android
curl https://dl.google.com/android/repository/android-ndk-r24-linux.zip -o android-ndk-r24.zip
unzip android-ndk-r24.zip && mv android-ndk-r24 ${HOME}/android

• Download android-sdk. (android-sdk is downloaded indirectly through the commandlinetools tool).

Website: https://developer.android.com/studio, select Command line tools Among the download items

mkdir -p  ${HOME}/android/android-sdk

# Download Tools
curl https://dl.google.com/android/repository/commandlinetools-linux-8512546_latest.zip -o commandlinetools.zip
unzip commandlinetools.zip
mv cmdline-tools ${HOME}/android/android-sdk

# Download Android SDK
${HOME}/android/android-sdk/cmdline-tools/bin/sdkmanager "platform-tools" "platforms;android-23" --sdk_root=${HOME}/android/android-sdk/cmdline-tools

Note: 23 in android-23 is the API level. This corresponds to Android6.0. For Android10, android-29 is required. Decide which API level Android version to use

• Install gomobile and gobind. After upgrading the go version to go1.16 or above, execute the command:

go install golang.org/x/mobile/cmd/gomobile@latest
go install golang.org/x/mobile/cmd/gobind@latest

• Clear the local go-build cache, the directory is ~/.cache/go-build
  

• ##Compile makefile

  
  

# config
export ANDROID_HOME=${HOME}/android/android-sdk/cmdline-tools
export ANDROID_NDK_HOME=${HOME}/android/android-ndk-r24
export TOOL=${HOME}/android/android-ndk-r24

android: depend
    gomobile bind -target=android/arm64 -androidapi=23 -o device.aar -v -x ${HOME}/demo

ios: depend
    gomobile bind -target=ios -o device.framework -v ${HOME}/demo

depend:
    cd ${HOME}/demo
    gomobile init
    go get golang.org/x/mobile/bind

clean:
    rm -rvf libdevice.*

androidapi is the API version, target is the CPU architecture

// demo.go
package demo

import (
    "fmt"
    "io/ioutil"
    "path/filepath"
    "time"
)

var done = make(chan struct{})

func Start(dir string) {
    fmt.Println("dir", dir)

    file := filepath.Join(dir, "test.log")
    err := ioutil.WriteFile(file, []byte(time.Now().String()), 0666)
    if err != nil {
        fmt.Printf("Writefile:%v\n", err)
    }
    select {
    case <-done:
    case <-time.After(10 * time.Minute):
    }
}

func Stop(mac string) {
    fmt.Println("stop mac", mac)
    close(done)
}

Compile Go Android executable program

• Download android-ndk. URL:

  https://developer.android.com/ndk /downloads

##

mkdir -p ${HOME}/android
curl https://dl.google.com/android/repository/android-ndk-r24-linux.zip -o android-ndk-r24.zip
unzip android-ndk-r24.zip && mv android-ndk-r24 ${HOME}/android

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Download android-sdk

export ARCH=arm
export NDK_ROOT=${HOME}/android/ndk-toolchain/${ARCH}
python ${HOME}/android/android-ndk-r24/build/tools/make_standalone_toolchain.py --arch $ARCH --api 22 --install-dir $NDK_ROOT

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Compile

export CC=${HOME}/android/ndk-toolchain/arm/bin/arm-linux-androideabi-gcc
export GOOS=android
export GOARCH=arm
export GOARM=7
export CGO_ENABLED=1

go build -x main.go

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The main.go here is just a simple Go program.

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