Flutter

问题 I have created method and widget , right now my code is working fine because data is static , i want to add new item in ListTile when i press Add Button. method: Card listSectionMethod(String title, String subtitle, IconData icon) { return new Card( child: ListTile( title: Text( title, style: TextStyle(fontWeight: FontWeight.bold), ), subtitle: Text(subtitle), trailing: Icon( icon, color: Colors.blue, ), ), ); } Widget: Widget listSection = Container( margin: EdgeInsets.only(top: 210), child:

问题 I created a route for navigating from one page to another, in the following way class task extends StatelessWidget{ @override Widget build(BuildContext context) { return MaterialApp( title: 'Task', home: new task(), routes: <String, WidgetBuilder>{ "/Completed": (BuildContext context) => new Completed() } ); } } class taskScreen extends StatefulWidget{ @override taskState createState() => new taskState(); } class taskState extends State<taskScreen> { @override Widget build(BuildContext

问题 I'm struggling in a Flutter situation with multiple navigators. Concept here is a page which triggers a modal with his own flow of multiple pages. Inside the modal everything is going swiftly (navigation pushes/pops are working), but if the modal is dismissed it removes every page of the lowest navigator. I've looked at the example of https://stackoverflow.com/a/51589338, but I'm probably missing something here. There's a wrapper Widget inside a page which is the root of the application.

问题 I'm struggling in a Flutter situation with multiple navigators. Concept here is a page which triggers a modal with his own flow of multiple pages. Inside the modal everything is going swiftly (navigation pushes/pops are working), but if the modal is dismissed it removes every page of the lowest navigator. I've looked at the example of https://stackoverflow.com/a/51589338, but I'm probably missing something here. There's a wrapper Widget inside a page which is the root of the application.

问题 I'm struggling in a Flutter situation with multiple navigators. Concept here is a page which triggers a modal with his own flow of multiple pages. Inside the modal everything is going swiftly (navigation pushes/pops are working), but if the modal is dismissed it removes every page of the lowest navigator. I've looked at the example of https://stackoverflow.com/a/51589338, but I'm probably missing something here. There's a wrapper Widget inside a page which is the root of the application.

问题 I created a route for navigating from one page to another, in the following way class task extends StatelessWidget{ @override Widget build(BuildContext context) { return MaterialApp( title: 'Task', home: new task(), routes: <String, WidgetBuilder>{ "/Completed": (BuildContext context) => new Completed() } ); } } class taskScreen extends StatefulWidget{ @override taskState createState() => new taskState(); } class taskState extends State<taskScreen> { @override Widget build(BuildContext

问题 I need to query fields and get all sub-collections and fields. Is it possible? Stream<List<ChatFieldModel>> getChatField(String uid) { var ref = _db.collection('chats') .where('toUserId', isEqualTo: uid); //Afterthat need to get sub collection with sub collection list of documents and main collection fields value. is it possible? return ref.snapshots().map((list) => list.documents .map((doc) => ChatFieldModel.fromForestore(doc)) .toList()); } 回答1: Firestore queries are shallow. They only

问题 I need to query fields and get all sub-collections and fields. Is it possible? Stream<List<ChatFieldModel>> getChatField(String uid) { var ref = _db.collection('chats') .where('toUserId', isEqualTo: uid); //Afterthat need to get sub collection with sub collection list of documents and main collection fields value. is it possible? return ref.snapshots().map((list) => list.documents .map((doc) => ChatFieldModel.fromForestore(doc)) .toList()); } 回答1: Firestore queries are shallow. They only

问题 I want to change the colors in the ColorTween when I call setState() in Flutter Here is my animated image import 'dart:async'; import 'package:flutter/material.dart'; import 'package:flutter/widgets.dart'; class FingerprintImageWidget extends StatefulWidget { FingerprintImageWidget( {Key key, this.width, this.height, this.beginColor, this.endColor}) : super(key: key); final double width; final double height; Color beginColor; Color endColor; @override FingerprintImageWidgetState createState()

问题 I want to change the colors in the ColorTween when I call setState() in Flutter Here is my animated image import 'dart:async'; import 'package:flutter/material.dart'; import 'package:flutter/widgets.dart'; class FingerprintImageWidget extends StatefulWidget { FingerprintImageWidget( {Key key, this.width, this.height, this.beginColor, this.endColor}) : super(key: key); final double width; final double height; Color beginColor; Color endColor; @override FingerprintImageWidgetState createState()