大家好，我正在尝试从另一个类访问函数，因为该函数建立了调用并导航到调用页面，所以可以肯定会有setState函数来更新UI，但是当UI从另一个类更新时，这就是问题所在该应用程序将退出小部件树，因此我必须使用callBack函数，这是我不知道如何获得帮助的
这是perant类：
import 'dart:async';
import 'package:agora_rtc_engine/agora_rtc_engine.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:flutter_modular/flutter_modular.dart';
import 'package:flutter_social_messenger/src/modules/auth/domain/entities/user.dart';
import 'package:flutter_social_messenger/src/modules/auth/export.dart';
import 'package:flutter_social_messenger/src/modules/notifications/domain/entities/call_msg.dart';
import 'package:flutter_social_messenger/src/modules/notifications/domain/entities/notification.dart';
import 'package:flutter_social_messenger/src/modules/notifications/domain/repository/repo.dart';
import 'package:permission_handler/permission_handler.dart';
import '../../export.dart';
import './call.dart';
class IndexPage extends StatefulWidget {
String userId;
IndexPage(String this.userId);
@override
State<StatefulWidget> createState() => IndexState();
}
class IndexState extends State<IndexPage> {
/// create a channelController to retrieve text value
final _channelController = TextEditingController();
/// if channel textField is validated to have error
bool _validateError = false;
ClientRole _role = ClientRole.Broadcaster;
User currentUser = Modular.get<AuthController>().currentUser;
@override
void dispose() {
// dispose input controller
_channelController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
print("target : " + widget.userId.toString() ) ;
return Scaffold(
appBar: AppBar(
title: Text('Make a Call'),
),
body: Center(
child: Container(
padding: const EdgeInsets.symmetric(horizontal: 20),
height: 400,
child: Column(
children: <Widget>[
/*
Row(
children: <Widget>[
Expanded(
child: TextField(
controller: _channelController..text = 'call-' + currentUser.id + "-" + widget.userId ,
decoration: InputDecoration(
errorText:
_validateError ? 'Channel name is mandatory' : null,
border: UnderlineInputBorder(
borderSide: BorderSide(width: 1),
),
hintText: 'call-' + widget.userId + "-" + currentUser.id ,
),
))
],
),
Column(
children: [
ListTile(
title: Text(ClientRole.Broadcaster.toString()),
leading: Radio(
value: ClientRole.Broadcaster,
groupValue: _role,
onChanged: (ClientRole value) {
setState(() {
_role = value;
});
},
),
),
ListTile(
title: Text(ClientRole.Audience.toString()),
leading: Radio(
value: ClientRole.Audience,
groupValue: _role,
onChanged: (ClientRole value) {
setState(() {
_role = value;
});
},
),
)
],
),
*/
Padding(
padding: const EdgeInsets.symmetric(vertical: 20),
child:
Row( children: <Widget>[
// Expanded(child: Text('call-' + currentUser.id + "-" + widget.userId ) ),
Expanded( child:
RawMaterialButton(
onPressed: () => onJoin(widget.userId,context,currentUser.id) ,
child: Icon(
Icons.call_end,
color: Colors.white,
size: 35.0,
),
shape: CircleBorder(),
elevation: 2.0,
fillColor: Colors.green,
padding: const EdgeInsets.all(15.0),
)
// RaisedButton(
// onPressed: onJoin,
// child: Text('Dial'),
// color: Colors.blueAccent,
// textColor: Colors.white,
// ),
) ], ),
)
],
),
),
),
);
}
DateTime get now => DateTime.now().toUtc();
Future<void> sendFollowNotification() {
String sendToId = widget.userId;
final followerId = currentUser.id;
print("trying to send call notification Id : " + "call-$followerId-$sendToId") ;
final not = CallNotification(
id: "call-$followerId-$sendToId",
sendTo: followerId,
senderId: sendToId,
senderName: currentUser.name,
time: now,
);
return repository.sendNotificaion(not);
}
Future<void> sendCallAlert() async {
String sendToId = widget.userId;
final followerId = currentUser.id;
print("trying to send call notification Id : " + "call-$followerId-$sendToId") ;
final not = CallNotification(
id: "call-$followerId-$sendToId",
sendTo: followerId,
senderId: sendToId,
senderName: currentUser.name,
time: now,
);
await Modular.get<NotificationsHelper>()
.registerNotification(followerId, true);
_callDocument("call-$followerId-$sendToId").setData(not.toJson());
// return _callCollection.document(currentUser.id).setData(not.toJson()) ;
// return repository.sendNotificaion(not);
}
final repository = Modular.get<NotificationReposity>();
final appStore = Modular.get<AppStore>();
final _firestore = Firestore.instance;
DocumentReference _callDocument(String callId) =>
_callCollection.document(callId);
CollectionReference get _callCollection => _firestore.collection("calls");
Future<void> onJoin(String userId,BuildContext context,final _followerId) async {
// print("qqqq") ;
String sendToId = userId;
final followerId = _followerId;
// print(userId+" i'm");
// print(_followerId+" his");
_channelController.text = "call-$followerId-$sendToId" ;
print("diallllll : " + _channelController.text ) ;
// /*
// update input validation
setState(() {
_channelController.text.isEmpty
? _validateError = true
: _validateError = false;
});
sendFollowNotification();
sendCallAlert();
if (_channelController.text.isNotEmpty) {
print('hiiiiissss');
// await for camera and mic permissions before pushing video page
await _handleCameraAndMic();
// push video page with given channel name
await Navigator.push(
context,
MaterialPageRoute(
builder: (context) => CallPage(
channelName: _channelController.text,
role: _role,
),
),
);
}
// */
}
Future<void> _handleCameraAndMic() async {
// if (kIsWeb || !Platform.isAndroid) return true;
if (!await Permission.camera.isGranted && !await Permission.microphone.isGranted) {
var rr = ((await Permission.camera.request()).isGranted && (await Permission.microphone.request()).isGranted) ;
print("rr : " + rr.toString()) ;
}
}
// Future<bool> checkStoragePermission() async {
// if (kIsWeb || !Platform.isAndroid) return true;
// if (!await Permission.storage.isGranted) {
// return (await Permission.storage.request()).isGranted;
// }
// return true;
// }
}
这是孩子：
import 'package:agora_rtc_engine/agora_rtc_engine.dart';
import 'package:flutter/material.dart';
import 'package:flutter_mobx/flutter_mobx.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:styled_widget/styled_widget.dart';
import '../../../../../chat/presentation/calling/index.dart';
import '../../../../../chat/presentation/calling/index.dart';
import '../../../../../chat/presentation/calling/index.dart';
import '../../../../../chat/presentation/calling/index.dart';
import '../../../../../chat/presentation/calling/index.dart';
import '../../../../export.dart';
import '../controller.dart';
import '../../widgets/profile_avatar.dart';
import 'package:flutter_social_messenger/src/modules/chat/presentation/calling/index.dart';
import 'package:flutter_social_messenger/src/modules/chat/presentation/calling/call.dart';
class OProfileHeader extends StatelessWidget implements PreferredSizeWidget {
final OtherUserProfileController controller;
OProfileHeader({Key key, @required this.controller}) : super(key: key);
User get user => controller.otherUser;
@override
Widget build(BuildContext context) {
final theme = Theme.of(context);
print("OProfileHeader : " + controller.isFollowing.toString() ) ;
return Stack(
children: <Widget>[
Positioned(
bottom: 200,
left: 0,
right: 0,
child: SizedBox(height: 200)
.decorated(gradient: AppTheme.primaryGradient),
),
Positioned(
bottom: 150,
left: 1,
right: 1,
child: Center(
child: Material(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
elevation: 5.0,
color: theme.scaffoldBackgroundColor,
child: Column(
children: <Widget>[
Observer(
builder: (_) => Text(
user.name ?? "",
style: GoogleFonts.basic().copyWith(fontSize: 28),
maxLines: 1,
),
).padding(top: 40),
Text(user.status ?? "").padding(bottom: 10),
],
),
).width(MediaQuery.of(context).size.width * 4 / 5),
),
),
Positioned(
left: 0,
right: 0,
bottom: 300,
child: AppBar(
backgroundColor: Colors.transparent,
iconTheme: IconThemeData(),
elevation: 0,
),
),
Positioned(
left: 0,
right: 0,
bottom: 210,
child: Center(
child: Material(
elevation: 5.0,
shape: CircleBorder(),
child: Observer(
builder: (_) => ProfileAvatarWidget(
photoUrl: user.photoUrl,
// isLoading: state is LoadingProfilePic,
),
),
),
),
),
Positioned(
right: 200,
left: 0,
bottom: 60,
child: Center(
child: Observer(
builder: (_) {
controller.currentUser.following;
return RaisedButton(
color: controller.isFollowing
? Colors.black
: theme.primaryColor,
onPressed: () => controller.followUser(user.id),
child: Text(
controller.isFollowing ? "UnFollow" : "Follow",
style: GoogleFonts.alike().copyWith(
fontSize: 16,
color: Colors.white,
),
textAlign: TextAlign.center,
).width(70),
);
},
),
),
),
Positioned(
right: 0,
left: 200,
bottom: 60,
child: Center(
child: Observer(
builder: (_) {
controller.currentUser.following;
return RaisedButton(
color: Colors.green,
onPressed: ()=> {
IndexState().onJoin(user.id,context,controller.currentUser.id),
print(controller.currentUser.id+" "+controller.currentUser.phoneNumber),
print(user.id+" "+user.phoneNumber)
},
child: Text(
"Call",
style: GoogleFonts.alike().copyWith(
fontSize: 16,
color: Colors.white,
),
textAlign: TextAlign.center,
).width(70),
);
},
),
),
),
],
).height(500).backgroundColor(theme.scaffoldBackgroundColor);
}
@override
Size get preferredSize => Size.fromHeight(400);
//----------------------------------------------------
// */
}
答案 0 :(得分：0)
我不确定您想要什么，但是如果它是如何从父窗口小部件中调用方法的，则将是这样的：
class ParentWidget extends StatelessWidget{
@override
Widget build(BuildContext context) {
return ChildWidget(onAction: (resultValue){
//Do something with the value
});
}
}
class ChildWidget extends StatelessWidget{
final Function onAction;
ChildWidget({Key key, @required this.onAction}) : super(key: key);
@override
Widget build(BuildContext context) {
return Inkwell(
onTap: (){
onAction(someValue);
}
child: AnyOtherWidget
);
}
}