从另一个类访问功能

分类：编程问答

如何解决从另一个类访问功能

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,)
                ],*/
              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",);
    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,bottom: 300,child: AppBar(
            backgroundColor: Colors.transparent,iconTheme: IconThemeData(),elevation: 0,bottom: 210,child: Center(
            child: Material(
              elevation: 5.0,child: Observer(
                builder: (_) => ProfileAvatarWidget(
                  photoUrl: user.photoUrl,// isLoading: state is LoadingProfilePic,Positioned(
          right: 200,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,textAlign: TextAlign.center,).width(70),);
              },Positioned(
          right: 0,left: 200,child: Center(
            child: Observer(
              builder: (_) {
                controller.currentUser.following;
                return RaisedButton(
                  color: Colors.green,onPressed: ()=> {
                    IndexState().onJoin(user.id,controller.currentUser.id),print(controller.currentUser.id+"    "+controller.currentUser.phoneNumber),print(user.id+"    "+user.phoneNumber)
                  },child: Text(
                    "Call",).height(500).backgroundColor(theme.scaffoldBackgroundColor);
  }

  @override
  Size get preferredSize => Size.fromHeight(400);
  //----------------------------------------------------

    // */
  }

解决方法

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
         );
       }
    }

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