sample_communication 是一个用于 Flutter 和原生平台（如 Android 和 iOS）之间进行通信的插件。它允许你在 Flutter 应用中调用原生代码，并从原生代码中获取结果。以下是如何使用 sample_communication 插件的基本步骤：

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 sample_communication 插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  sample_communication: ^1.0.0  # 请使用最新版本

然后运行 flutter pub get 来获取依赖。

2. 创建 Flutter 端代码

在 Flutter 中，你可以使用 MethodChannel 来与原生平台进行通信。以下是一个简单的示例：

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: CommunicationSample(),
    );
  }
}

class CommunicationSample extends StatefulWidget {
  @override
  _CommunicationSampleState createState() => _CommunicationSampleState();
}

class _CommunicationSampleState extends State<CommunicationSample> {
  static const platform = MethodChannel('com.example.sample_communication/communication');

  String _responseFromNative = 'Waiting for response...';

  Future<void> _callNativeMethod() async {
    String response;
    try {
      final String result = await platform.invokeMethod('getMessageFromNative');
      response = result;
    } on PlatformException catch (e) {
      response = "Failed to get response: '${e.message}'.";
    }

    setState(() {
      _responseFromNative = response;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Sample Communication'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(_responseFromNative),
            ElevatedButton(
              onPressed: _callNativeMethod,
              child: Text('Call Native Method'),
            ),
          ],
        ),
      ),
    );
  }
}

3. 配置 Android 端代码

在 Android 项目中，你需要在 MainActivity.kt 或 MainActivity.java 中设置 MethodChannel 并处理来自 Flutter 的调用。

Kotlin 示例：

package com.example.sample_communication

import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel

class MainActivity: FlutterActivity() {
    private val CHANNEL = "com.example.sample_communication/communication"

    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)
        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler { call, result ->
            if (call.method == "getMessageFromNative") {
                val message = "Hello from Native Android!"
                result.success(message)
            } else {
                result.notImplemented()
            }
        }
    }
}

Java 示例：

package com.example.sample_communication;

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodChannel;

public class MainActivity extends FlutterActivity {
    private static final String CHANNEL = "com.example.sample_communication/communication";

    @Override
    public void configureFlutterEngine(FlutterEngine flutterEngine) {
        super.configureFlutterEngine(flutterEngine);
        new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL).setMethodCallHandler(
                (call, result) -> {
                    if (call.method.equals("getMessageFromNative")) {
                        String message = "Hello from Native Android!";
                        result.success(message);
                    } else {
                        result.notImplemented();
                    }
                }
        );
    }
}

4. 配置 iOS 端代码

在 iOS 项目中，你需要在 AppDelegate.swift 中设置 MethodChannel 并处理来自 Flutter 的调用。

Swift 示例：

import UIKit
import Flutter

[@UIApplicationMain](/user/UIApplicationMain)
[@objc](/user/objc) class AppDelegate: FlutterAppDelegate {
    override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
        let communicationChannel = FlutterMethodChannel(name: "com.example.sample_communication/communication",
                                                        binaryMessenger: controller.binaryMessenger)
        communicationChannel.setMethodCallHandler({
            (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
            if call.method == "getMessageFromNative" {
                result("Hello from Native iOS!")
            } else {
                result(FlutterMethodNotImplemented)
            }
        })
        
        GeneratedPluginRegistrant.register(with: self)
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }
}