Go practices in Android development

Practice Go in Android development: Set up Go development environment: Install Go and Android NDK. Create an Android app: Create a new project using Android Studio. Integrate Go: Create the go directory and main.go file in the jni directory. Compile Go code: Run the go build command to compile the main.go file. Add Native interface: Declare native method callGo() in MainActivity.java. Load the Go shared library: Use System.loadLibrary("go") in MainActivity.java to load the Go shared library. Practical case: Display a Toast message in main.go and call the MakeToast() method in Android.

Go practice in Android development

Introduction

Go is developed by Google A modern programming language known for its simplicity, concurrency, and efficiency. In the world of Android app development, Go is gaining popularity as it offers native performance and cross-platform advantages. This article will guide you how to use Go in Android applications and provide a practical example.

Set up the Go development environment

1. Install Go: Visit https://go.dev/dl/ to download and install Go.
2. Configure environment variables: Add the Go installation directory to the PATH environment variable.
3. Install Android NDK: Follow the instructions at https://developer.android.com/ndk/downloads to install the Android NDK.

Create an Android application

Create a new Android project using Android Studio. Select the "Empty Activity" module in the "New Project" dialog.

Integrate Go

1. Create the go directory under the app/src/main/jni directory.
2. Create the main.go file in the go directory, containing the following code:

package main

// 此函数在 Android 应用程序启动时调用
import "C"

func main() {}

3. In app Create a subdirectory corresponding to the application ABI in the /src/main/jnilibs directory (for example, arm64-v8a).
4. Create a symbolic link named libgo.so in the created subdirectory, pointing to the library file generated by Go compilation.

Compile the Go code

1. Open a terminal window and navigate to the project directory.
2. Run the following command to compile Go code:

go build -buildmode=c-shared -o libgo.so main.go

Add Native interface

In order to call Go code in Android code, you need to add a JNI (Java Native Interface) interface. Create the MainActivity.java file in the app/src/main/java/<PACKAGE_NAME> directory, containing the following code:

import android.app.Activity;
import android.os.Bundle;

// 声明一个 native 方法
public class MainActivity extends Activity {
    // 此方法将调用 Go 代码
    public native void callGo();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 调用 Go 代码
        callGo();
    }

    // 加载 Go 共享库
    static {
        System.loadLibrary("go");
    }
}

Actual case: Displaying a Toast message

Use Go to display a Toast message. Add the following code in the main.go file:

package main

import "C"

// 在 Android 中显示 Toast 消息
import (
    "context"
    "log"

    "github.com/go-android/go-android/android"
)

func main() {
    ctx := context.Background()
    activity := android.ActivityFromContext(ctx)

    // 创建一个 Toast 消息
    toast := activity.MakeToast()
    toast.SetText("Hello from Go!")

    // 显示 Toast 消息
    toast.Show()

    // 主 Go 程序进入阻塞
    log.Println("native: waiting")
    select {}
}

Run the application

Compile and run the Android application. You should see a Toast message from your Go code on the device or simulator.

Summary

Using Go to develop Android applications can improve performance, simplify concurrency, and realize cross-platform benefits. This article provides a step-by-step guide to help you integrate Go and provides a practical example of displaying Toast messages.

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