Golang for Android Development

It’s good to write Golang for producing binary file, then use it everywhere

Cython could do the same thing by convert python to c, then c to binary.

First, you should write a program at ~/go/github/yingshaoxo/hi/main.go

 package greeting




 func SayHi() string {

 return "Hi!"

 }

Capitalize the function name, so golang would treat that function as public.

Then, compile it to a binary file

 go get golang.org/x/mobile/cmd/gomobile

 gomobile init


 gomobile bind -target=android

If it ask for NDK, install it and make sure the Environmental-Variable was set right.

#add the following to your `~/.bashrc`:
export ANDROID_HOME=$HOME/Android/Sdk
export ANDROID_NDK_HOME=$ANDROID_HOME/ndk/21.3.6528147
export PATH=$PATH:$GOPATH/bin:$ANDROID_HOME/platform-tools/

If everything was right, you’ll get two files: greeting.aar and greeting-sources.jar

Let’s import it to Android Studio Project

  1. Let’s assume you have a project which was named ABI_Test

  2. mkdir ABI_Test/app/libs

  3. mv greeting.aar ABI_Test/app/libs/ and mv greeting-sources.jar ABI_Test/app/libs/

  4. add implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar']) to ABI_Test/app/build.gradle

  5. rebuild the project

Let’s use it with the following codes

 import greeting.Greeting




 var words = Greeting.sayHi()

 Toast.makeText(applicationContext, words, Toast.LENGTH_LONG).show()
The real codes

  import greeting.Greeting




 class MainActivity : AppCompatActivity() {




     override fun onCreate(savedInstanceState: Bundle?) {

         super.onCreate(savedInstanceState)

         setContentView(R.layout.activity_main)




         var words = Greeting.sayHi()

         Toast.makeText(applicationContext, words, Toast.LENGTH_LONG).show()

     }

 }

https://github.com/yingshaoxo/Go_tutorial_for_Pythoner/blob/master/go-for-android.md

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