本文将通过MethodChannel获取设备信息，以此来演练MethodChannel用法。

• 建立channel

        flutter代码：

MethodChannel methodChannel = MethodChannel("com.xmg.test");

        ohos代码：

private channel: MethodChannel | null = nullthis.channel = new MethodChannel(flutterEngine.dartExecutor.getBinaryMessenger(), 'com.xmg.test')this.channel.setMethodCallHandler({onMethodCall(call: MethodCall, result: MethodResult): void {switch (call.method) {case 'getDeviceInfo':result.success(deviceInfo.displayVersion);break;default:result.notImplementedbreak;}}});

注意：channelName必须一致。这里都叫com.xmg.test

• flutter侧调用

  void _getDeviceInfo() async{deviceInfo = await methodChannel.invokeMethod('getDeviceInfo');setState(() {});}

• 完整代码

        flutter完整代码：

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';void main() {runApp(const MyApp());
}class MyApp extends StatelessWidget {const MyApp({super.key});@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Flutter Demo',theme: ThemeData(primarySwatch: Colors.blue,),home: const MyHomePage(title: 'MethodChannel获取设备信息'),);}
}class MyHomePage extends StatefulWidget {const MyHomePage({super.key, required this.title});final String title;@overrideState<MyHomePage> createState() => _MyHomePageState();
}class _MyHomePageState extends State<MyHomePage> {MethodChannel methodChannel = MethodChannel("com.xmg.test");String deviceInfo = "";void _getDeviceInfo() async{deviceInfo = await methodChannel.invokeMethod('getDeviceInfo');setState(() {});}@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text(widget.title),),body: Center(child: Column(mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[Text(deviceInfo,),ElevatedButton(onPressed: () {_getDeviceInfo();}, child: Text("获取设备版本号"))],),),);}
}

        ohos完整代码：

import { FlutterAbility, FlutterEngine, MethodCall, MethodChannel, MethodResult } from '@ohos/flutter_ohos';
import { GeneratedPluginRegistrant } from '../plugins/GeneratedPluginRegistrant';
import deviceInfo from '@ohos.deviceInfo'export default class EntryAbility extends FlutterAbility {private channel: MethodChannel | null = nullconfigureFlutterEngine(flutterEngine: FlutterEngine) {super.configureFlutterEngine(flutterEngine)GeneratedPluginRegistrant.registerWith(flutterEngine)this.channel = new MethodChannel(flutterEngine.dartExecutor.getBinaryMessenger(), 'com.xmg.test')this.channel.setMethodCallHandler({onMethodCall(call: MethodCall, result: MethodResult): void {switch (call.method) {case 'getDeviceInfo':result.success(deviceInfo.displayVersion);break;default:result.notImplementedbreak;}}});}
}

• 效果展示