Field '_areas' should be initialized because its type 'List<Area>' doesn't allow null

Flutter shows error Non-nullable instance field ‘_areas’ must be initialized. Maybe this is because of not defining null in lists areas what when defining null Like List? _areas; it shows an error on the index Error: Field ‘_areas’ should be initialized because its type ‘List’ doesn’t allow null. Error Line: List _areas; Here is my… Read More Field '_areas' should be initialized because its type 'List<Area>' doesn't allow null

May 27, 2022 MRLeave a comment

How to add borders for SnackBar in Flutter?

I’m doing system messages, I decided to use SnackBar, but I ran into a problem – I can’t add a border around the SnackBar, I need to make a colored border. Please tell me, is it possible to add a border to the SnackBar and how? Perhaps there are packages that allow you to do… Read More How to add borders for SnackBar in Flutter?

May 25, 2022 MRLeave a comment

The argument type 'Function' can't be assigned to the parameter type 'void Function()?'

import ‘package:flutter/material.dart’; import ‘package:ourchatapp/constants.dart’; class RoundedButton extends StatelessWidget { final String text; final Function press; final Color color, textColor; const RoundedButton({ Key? key, required this.text, required this.press, this.color = kPrimaryColor, this.textColor = Colors.white, }) : super(key: key); @override Widget build(BuildContext context) { Size size = MediaQuery.of(context).size; return Container( margin: EdgeInsets.symmetric(vertical: 10), width: size.width * 0.8,… Read More The argument type 'Function' can't be assigned to the parameter type 'void Function()?'

May 23, 2022 MRLeave a comment

Argument of type 'string' is not assignable to parameter of type 'Pick<IJobs, "name">'

Why I get this error? Argument of type ‘string’ is not assignable to parameter of type ‘Pick<IJobs, "name">’. Type ‘string’ is not assignable to type ‘Pick<IJobs, "name">’ mockData: export const Jobs: IJobs[] = [ { id: ‘1’, name: ‘Trader’, available: true }, { id: ‘2’, name: ‘Seller’, available: true }, { id: ‘3’, name: ‘Manager’,… Read More Argument of type 'string' is not assignable to parameter of type 'Pick<IJobs, "name">'

May 21, 2022 MRLeave a comment

Why is ElevatedButton getting stretched and becoming a background?

I’m new on flutter and I don’t have an idea why ElevatedButton stretched and become a background. I just want a simple button. How can I solve this problem? Here’s the image below: Here’s my code @override Widget build(BuildContext context) { return Scaffold( body: Center( child: ElevatedButton( onPressed: () { Navigator.pop(context); }, child: SafeArea( child:… Read More Why is ElevatedButton getting stretched and becoming a background?

May 21, 2022 MRLeave a comment

React Native, passing data between screens when using BottomTabsNavigator

I am trying to make a react native application. I am using Bottom Tab Navigation, and I have 2 screens. On the first screen, a qr code is first scanned, it contains a string, which is written on the screen. Then I would like to write out the afformentioned string on the second tab. How… Read More React Native, passing data between screens when using BottomTabsNavigator

May 21, 2022 MRLeave a comment

How to move a function into a separate method?

I have a function that is called when a ListTile is clicked. I need to move it to a separate method. The function is in onTap. I want to put it in a separate method outside of build. How can i do this? class _HomeScreenState extends State<HomeScreen> { @override Widget build(BuildContext context) { return Scaffold(… Read More How to move a function into a separate method?

May 20, 2022 MRLeave a comment

Why does this code display a blank screen when running?

Before displaying the code, here are the things that I checked to avoid similar answers : android:extratNativeLibs="true" Jsonfile firebase connected routegenerator and initialroute checked in the main file and generatorfile .I like to avoid mediaQuery and work with percentages, that is why I use FractionallySizedBox. Here is the code of the initial route : import… Read More Why does this code display a blank screen when running?

May 20, 2022 MRLeave a comment

React Native: Text onPress not working on android

I have the following code: <Text onPress={() => console.log(‘this won\’t print’)}>Dumb text</Text> According to React Native’s documentation, this works great in both iOS and Android, however when I run it myself, it only works on iOS, while Android acts as if the onPress prop doesn’t exist at all. I know I can use TouchableOpacity (all… Read More React Native: Text onPress not working on android

May 19, 2022 MRLeave a comment

Undefined is not an object (evaluating 'navigation.navigate') when trying to navigate between two sites React Native

I try to navigate between two pages in a React Native app. I keep getting errors for my implementations but I don’t know why. I have the following setup for a "Home" and "Settings" site in the React Native app with Navigator adjusted from the documentation: App.js import Home from "./Home"; import { NavigationContainer }… Read More Undefined is not an object (evaluating 'navigation.navigate') when trying to navigate between two sites React Native

May 18, 2022 MRLeave a comment

Dev solutions

Solutions for development problems

Tag: onpress

Field '_areas' should be initialized because its type 'List<Area>' doesn't allow null

How to add borders for SnackBar in Flutter?

Argument of type 'string' is not assignable to parameter of type 'Pick<IJobs, "name">'

Why is ElevatedButton getting stretched and becoming a background?

React Native, passing data between screens when using BottomTabsNavigator

How to move a function into a separate method?

Why does this code display a blank screen when running?

React Native: Text onPress not working on android

Undefined is not an object (evaluating 'navigation.navigate') when trying to navigate between two sites React Native