flutter 无法从H5 WebView 访问摄像头和录音权限

AndroidManifest.xml需要在 中添加以下权限：

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.VIDEO_CAPTURE" />
<uses-permission android:name="android.permission.AUDIO_CAPTURE" />

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:permission_handler/permission_handler.dart';Future main() async {WidgetsFlutterBinding.ensureInitialized();await Permission.camera.request();await Permission.microphone.request();runApp(MyApp());
}class MyApp extends StatefulWidget {@override_MyAppState createState() => new _MyAppState();
}class _MyAppState extends State<MyApp> {@overrideWidget build(BuildContext context) {return MaterialApp(home: InAppWebViewPage());}
}class InAppWebViewPage extends StatefulWidget {@override_InAppWebViewPageState createState() => new _InAppWebViewPageState();
}class _InAppWebViewPageState extends State<InAppWebViewPage> {InAppWebViewController _webViewController;@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text("InAppWebView")),body: Container(child: Column(children: <Widget>[Expanded(child: Container(child: InAppWebView(initialUrl: "https://appr.tc/r/158489234",initialOptions: InAppWebViewGroupOptions(crossPlatform: InAppWebViewOptions(mediaPlaybackRequiresUserGesture: false,debuggingEnabled: true,),),onWebViewCreated: (InAppWebViewController controller) {_webViewController = controller;},androidOnPermissionRequest: (InAppWebViewController controller, String origin, List<String> resources) async {return PermissionRequestResponse(resources: resources, action: PermissionRequestResponseAction.GRANT);//主要是这行代码是授权的}),),),])));}
}