Flutter

问题 Im making a simple app with tab bars. I need to change Bottom Navigation Bar's background colour to blue. The rest of the app should be in white background and navigation bar should be blue backgrounded. How should I do that? Setting canvasColor in ThemeData didnt work. Heres my code: import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatefulWidget { State<StatefulWidget> createState(){ return MyAppState(); } } class MyAppState extends State<MyApp>{

问题 Im making a simple app with tab bars. I need to change Bottom Navigation Bar's background colour to blue. The rest of the app should be in white background and navigation bar should be blue backgrounded. How should I do that? Setting canvasColor in ThemeData didnt work. Heres my code: import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatefulWidget { State<StatefulWidget> createState(){ return MyAppState(); } } class MyAppState extends State<MyApp>{

问题 Is it possible to add same type multiple ChangeNotifierProvider? return MultiProvider( providers: [ ChangeNotifierProvider<ValueNotifier<double>>( create: (_) => ValueNotifier<double>(0.0), ), ChangeNotifierProvider<ValueNotifier<double>>( create: (_) => ValueNotifier<double>(0.0), ), ], In my build method @override Widget build(BuildContext context) { ValueNotifier<double> firstNotifier = Provider.of(context, listen: true); ValueNotifier<double> secondNotifier = Provider.of(context, listen:

问题 I am trying to implement bloc pattern in rxdart . I am trying to build todo app type of app . I implemented showing all items in list but what I want is not to show completed and uncompleted items in different part . However I am not able to filter the items based on completed on rxdart . import 'package:rxdart/rxdart.dart'; import '../models/ShoppingItem.dart'; class ShoppingItemBloc { final _shoppingItems = BehaviorSubject<List<ShoppingItem>> (seedValue: []); Observable<List<ShoppingItem>>

问题 I am trying to implement bloc pattern in rxdart . I am trying to build todo app type of app . I implemented showing all items in list but what I want is not to show completed and uncompleted items in different part . However I am not able to filter the items based on completed on rxdart . import 'package:rxdart/rxdart.dart'; import '../models/ShoppingItem.dart'; class ShoppingItemBloc { final _shoppingItems = BehaviorSubject<List<ShoppingItem>> (seedValue: []); Observable<List<ShoppingItem>>

问题 I'm trying to create a Material design app without the Scaffold element: Here is the purely default app: import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super

问题 I'm trying to create a Material design app without the Scaffold element: Here is the purely default app: import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super

问题 I have a simple game made in Flutter and I can log in the user but I don't know how to check if the user is logged and how to get user's data if so. For log in I am using this method, after log in the user I can get his data: Future<String> signInWithGoogle() async{ print("INICIALIZANDO LOGIN COM GOOGLE..."); googleSignInAccount = await googleSignIn.signIn(); googleSignInAuthentication = await googleSignInAccount.authentication; final AuthCredential credential = GoogleAuthProvider

问题 I have a simple game made in Flutter and I can log in the user but I don't know how to check if the user is logged and how to get user's data if so. For log in I am using this method, after log in the user I can get his data: Future<String> signInWithGoogle() async{ print("INICIALIZANDO LOGIN COM GOOGLE..."); googleSignInAccount = await googleSignIn.signIn(); googleSignInAuthentication = await googleSignInAccount.authentication; final AuthCredential credential = GoogleAuthProvider