android - FlutterActivity MethodChannel和FlutterView
【摘要】
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...
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
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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.FlutterMain
class MainActivity : FlutterActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
GeneratedPluginRegistrant.registerWith(this) // here is the error: Type mismatch. Required: FlutterEngine! Found: MainActivity
MethodChannel(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"
}
}
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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);
}
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但遇到以下问题:
MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->
if (call.method == "helloFromNativeCode") {
val greetings = helloFromNativeCode()
result.success(greetings)
}
}
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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.FlutterMain
class 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 error
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"
}
}
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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 = "";
@override
Widget 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),
),
)
],
),
),
);
}
}
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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.FlutterMain
class MainActivity : FlutterActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// GeneratedPluginRegistrant.registerWith(this) // here is the error: Type mismatch. Required: FlutterEngine! Found: MainActivity
MethodChannel(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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文章来源: jianguo.blog.csdn.net，作者：坚果前端の博客，版权归原作者所有，如需转载，请联系作者。
原文链接：jianguo.blog.csdn.net/article/details/119887580
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