dart

问题 The following function fetches data from Firebase and I am using the data to pre-fill a form. However, the form is not pre-filled although I am successfully fetching data. I am assuming it has something to do with async and await logic but I am not sure what exactly the issue is. Will appreciate your inputs. Function Future<Address> fetchAddress() async { final url = 'https://m&m.firebaseio.com/address/$userId.json?auth=$authToken'; try { final response = await http.get(url); final

问题 The following function fetches data from Firebase and I am using the data to pre-fill a form. However, the form is not pre-filled although I am successfully fetching data. I am assuming it has something to do with async and await logic but I am not sure what exactly the issue is. Will appreciate your inputs. Function Future<Address> fetchAddress() async { final url = 'https://m&m.firebaseio.com/address/$userId.json?auth=$authToken'; try { final response = await http.get(url); final

问题 When I search, it goes according to the index of the query list. Like here. So it goes to the wrong page. I want the list to go according to its own index. How can I get the right index and apply it here: Navigator.push(context, MaterialPageRoute(builder: (context) => DetailPage(index))); buildSuggestions under SearchDelegate : @override Widget buildSuggestions(BuildContext context) { final suggestionList = query.isEmpty ? [" "] : MyData.TEAM_NAME .where((p) => p.toLowerCase().contains(query

问题 I am working with this API where I make an http request to this site to retrieve my Data https://fantasy.premierleague.com/api/bootstrap-static/ first time when I used it I couldn't retrieve any data, after some researches I solved the problem with a simple flutter upgrade ( I couldn't know what was the problem or why it was solved after the upgrade ), then after somedays I was working on the project and the problem occurred again and I am getting an empty body every Time I try to make a

问题 can anyone help me out? I'm struggling to figure out how I can get the coloured containers to extend to match the height of the tallest one in their row. Currently they have no fixed height/width and are wrapped in Expanded widgets to get their dynamic size. I'd like to keep their responsive sizes if possible. I already have a method in place to switch to a Column instead of a Row once the screen is small enough. Once in a Column I can use width: double.infinity because there is no horizontal

问题 Please help me in solving this error in my flutter application: class MyApp extends StatelessWidget { Future<bool> _onBackPressed(BuildContext context) { return showDialog( context:context,builder:(BuildContext context)=>AlertDialog(title: Text('Exit'), actions: <Widget>[ FlatButton( child:Text('NO'),onPressed: ()=>Navigator.pop(context,false)), FlatButton( child:Text('Yes'),onPressed: ()=>Navigator.pop(context,true)) ],)); } @override Widget build(BuildContext context) { return WillPopScope

问题 Please help me in solving this error in my flutter application: class MyApp extends StatelessWidget { Future<bool> _onBackPressed(BuildContext context) { return showDialog( context:context,builder:(BuildContext context)=>AlertDialog(title: Text('Exit'), actions: <Widget>[ FlatButton( child:Text('NO'),onPressed: ()=>Navigator.pop(context,false)), FlatButton( child:Text('Yes'),onPressed: ()=>Navigator.pop(context,true)) ],)); } @override Widget build(BuildContext context) { return WillPopScope

问题 I am building a flutter app for iOS. I have created a file type that my app and another app can share back and forth. I am using the flutter receive_sharing_intent library to achieve this. To test it, I made all the necessary changes to my info.plist file to handle my custom file type, I placed an example file of that file type in the downloads folder of my device (testing on ipad), and I click on it from there to open it up in my app. The OS knows that my app can handle it. So, my app opens,

问题 I had an another issue before using 'Provider' package with 'PersistentBottomNavBar' package in my flutter app. So after solving that issue, immediately I got another one. There is my source code. When I run this code my Android emulator crushes. With the following error message: The method 'map' was called on null. Receiver: null. Tried calling: map(Closure: (PersistentBottomNavBarItem) => Flexible) import 'package:flutter/cupertino.dart'; import 'package:flutter/services.dart'; import

问题 I am building a flutter app for iOS. I have created a file type that my app and another app can share back and forth. I am using the flutter receive_sharing_intent library to achieve this. To test it, I made all the necessary changes to my info.plist file to handle my custom file type, I placed an example file of that file type in the downloads folder of my device (testing on ipad), and I click on it from there to open it up in my app. The OS knows that my app can handle it. So, my app opens,