Getting error 'Null check operator used on a null value' while working with ListView in Flutter

I am working with a ListView. The code is given below: MediaQuery.removePadding( context: context, removeTop: true, child: ListView.separated( separatorBuilder: (context, index) { return Divider(); }, itemCount: 3, itemBuilder: (context, index) { return Padding( padding: EdgeInsets.all(8.0), child: Container( child: Row( crossAxisAlignment: CrossAxisAlignment.center, children: <Widget>[ Padding( padding: EdgeInsets.only(right: 6), child: SquareAvatar( assetLocation: ‘assets/images/profile_avatar.png’), ), Padding( padding: EdgeInsets.symmetric(horizontal:… Read More Getting error 'Null check operator used on a null value' while working with ListView in Flutter

Get json and show inforamtion in flutter ListView

I`m trying to work with JSON and display data in a widget I`m getting json from website https://jsonplaceholder.typicode.com/posts And I’m trying to display data from json in ListView I`m click on button, titles are displayed in list It’s working fine import ‘package:dio/dio.dart’; import ‘package:flutter/material.dart’; class NewsWidget extends StatefulWidget { const NewsWidget({super.key}); @override State<NewsWidget> createState() =>… Read More Get json and show inforamtion in flutter ListView

Flutter : 'package:flutter/src/rendering/viewport.dart': Failed assertion: line 1895 pos 16: 'constraints.hasBoundedHeight': is not true

SliverToBoxAdapter( child: Column( children: [ SizedBox( child: StreamBuilder( stream: data.snapshots(), builder: (context, snapshot) { if (snapshot.connectionState == ConnectionState.waiting) { const Center(child: CircularProgressIndicator(color: Colors.blue)); } if (snapshot.hasData) { return ListView.builder( physics: const BouncingScrollPhysics(parent: BouncingScrollPhysics()), padding: EdgeInsets.zero, scrollDirection: Axis.horizontal, shrinkWrap: true, itemCount: snapshot.data?.docs.length, itemBuilder: (context, index) { final DocumentSnapshot records = snapshot.data!.docs[index]; return Container(); }, ); }… Read More Flutter : 'package:flutter/src/rendering/viewport.dart': Failed assertion: line 1895 pos 16: 'constraints.hasBoundedHeight': is not true

ListTile not showing when added to listview

I am working on a leaderboard system where it sorts the map and it displays the keys on a listTile that’s inside a listView, but when I reload the app, It won’t show any listTiles Any help is appreciated here is the code for this widget import ‘package:flutter/material.dart’; import ‘package:flutter_screenutil/flutter_screenutil.dart’; Map players = {"Hello": 1468,… Read More ListTile not showing when added to listview

How to make Container height dynamic to fit ListView but to certain max height Flutter

I am trying to show ListView in a custom dialog window. What I want to make dialog box height dynamic according to ListView content but to certain max height. If the ListView content reaches specific height it should me scrollable. This is my code: class PeekTableDialog extends StatefulWidget { Order order; PeekTableDialog({required this.order}); @override State<StatefulWidget>… Read More How to make Container height dynamic to fit ListView but to certain max height Flutter

Django "NoReverseMatch: Reverse for 'ads.views.AdListView' not found" while doing Test

I implemented some tests to check the status code of some pages, but this one with the reverse function throws me the error: django.urls.exceptions.NoReverseMatch: Reverse for ‘ads.views.AdListView’ not found. ‘ads.views.AdListView’ is not a valid view function or pattern name. Reading the documentation and some answers on stackoverflow I’m supposed to use either the view function… Read More Django "NoReverseMatch: Reverse for 'ads.views.AdListView' not found" while doing Test

Flutter, The element type 'List<ListTile>' can't be assigned to the list type 'Widget'

I tried geting data from firebase and display it using streamBuilder but I get this error, how do I solve it. body: StreamBuilder<QuerySnapshot>( stream: firestore.collection(‘paymnet data’).snapshots(), builder: (context, snapshot) { return ListView( children: [ snapshot.data!.docs.map((DocumentSnapshot document){ Map<String,dynamic> data = document.data()! as Map<String, dynamic>; return ListTile( title: Text(data[‘amount’]), subtitle: Text(data[‘paid date’]), ); }).toList(); ], ); })… Read More Flutter, The element type 'List<ListTile>' can't be assigned to the list type 'Widget'

type object 'PizzaMenu' has no attribute '_default_manager'

I have following error while i try to reach PizzaDetailView on template: AttributeError at /pizza/6/ type object ‘PizzaMenu’ has no attribute ‘_default_manager’. Where is the problem? models.py class PizzaMenu(models.Model): name = models.CharField(max_length=30) description = models.TextField() ingredients = models.CharField(max_length=100) price = models.DecimalField(max_digits=4, decimal_places=2) def __str__(self): return self.name class Meta: ordering = ["price"] views.py from django.views.generic import… Read More type object 'PizzaMenu' has no attribute '_default_manager'