android - FlutterActivity MethodChannel和FlutterView

因此，大约4个月前，我编写了Flutter应用程序。现在，我想做一个小小的更改，但是我不能再编译应用程序了，因为GeneratedPluginRegistrant.registerWith(this)不再起作用了，我没有更改Kotlin代码，只更改了Dart代码。

“GeneratedPluginRegistrant.registerWith( this )”中的“此”向我显示此错误:

Type mismatch.
Required: FlutterEngine!
Found: MainActivity

MainActivity类:

import android.os.Bundle
import io.flutter.app.FlutterActivity
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugins.GeneratedPluginRegistrant
import io.flutter.view.FlutterMainclass MainActivity : FlutterActivity() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)GeneratedPluginRegistrant.registerWith(this) // here is the error: Type mismatch. Required: FlutterEngine! Found: MainActivityMethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->if (call.method == "helloFromNativeCode") {val greetings = helloFromNativeCode()result.success(greetings)}}}private fun helloFromNativeCode(): String {return "Hello from Native Android Code"}companion object {private const val CHANNEL = "flutter.native/helper"}
}

如果使用:

import io.flutter.embedding.android.FlutterActivity

代替

import io.flutter.app.FlutterActivity

我可以用

override fun configureFlutterEngine(flutterEngine: FlutterEngine) {GeneratedPluginRegistrant.registerWith(flutterEngine);}

但遇到以下问题:

MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->if (call.method == "helloFromNativeCode") {val greetings = helloFromNativeCode()result.success(greetings)}}

因为我在 flutterView 上遇到错误:

Unresolved reference: flutterView

代码如下所示:

import android.os.Bundle
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugins.GeneratedPluginRegistrant
import io.flutter.view.FlutterMainclass MainActivity : FlutterActivity() {override fun configureFlutterEngine(flutterEngine: FlutterEngine) {GeneratedPluginRegistrant.registerWith(flutterEngine);}override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result -> // here is the errorif (call.method == "helloFromNativeCode") {val greetings = helloFromNativeCode()result.success(greetings)}}}private fun helloFromNativeCode(): String {return "Hello from Native Android Code"}companion object {private const val CHANNEL = "flutter.native/helper"}
}

我希望有一个人可以帮助我。

最佳答案

代替flutterView，请使用flutterEngine.getDartExecutor()。

关于android - FlutterActivity MethodChannel和FlutterView，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59323505/

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_package_demo/theme/themes.dart';class UserPage extends StatefulWidget {const UserPage({Key key}) : super(key: key);@override_UserPageState createState() => _UserPageState();
}const String CHANNEL ="www.luckly.work"; //这儿要与        MethodChannel(flutterView, CHANNEL)中CHANNEL名称一致
const String invokeMethod ="breeze"; //这儿要与       call.method == invokeMethod中invokeMethod名称一致
var channel = const MethodChannel(CHANNEL);class _UserPageState extends State<UserPage> {String _result = "";@overrideWidget build(BuildContext context) {final theme = Theme.of(context);return Scaffold(appBar: AppBar(title: Text("个人",style: TextStyle(color: theme.accentColor,),),),body: Container(child: Column(children: [Text("个人",style: TextStyle(color: theme.accentColor,),),FlatButton(onPressed: () {setState(() {});currentTheme.toggleTheme();},child: Text("多主题",style: TextStyle(color: theme.accentColor,),),),Center(child: RaisedButton(onPressed: () async {var result = await channel.invokeMethod(invokeMethod);setState(() {_result = result;});print(result);},child: new Text(_result),),)],),),);}
}

package com.example.flutter_package_demo//import io.flutter.app.FlutterActivity
import android.os.Bundle
import io.flutter.app.FlutterActivity
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugins.GeneratedPluginRegistrant//import io.flutter.embedding.android.FlutterActivity//import io.flutter.view.FlutterMainclass MainActivity : FlutterActivity() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)//        GeneratedPluginRegistrant.registerWith(this) // here is the error: Type mismatch. Required: FlutterEngine! Found: MainActivityMethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->if (call.method == InvokeMethod) {val greetings = successNativeCode()result.success(greetings)}}}private fun successNativeCode(): String {return "我是android原生跑过来的数据"}companion object {private const val CHANNEL = "www.luckly.work"private const val InvokeMethod = "breeze"}
}

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