Incorrect use of parent data widget. expanded widgets must be placed inside flex widgets
Expanded cannot be used inside a Stack. You should use Expanded only within a Column, Row or Flex
flutter
How to create a hyperlink in Flutter widget?
Just wrap an InkWell around a Text widget and supply an UrlLauncher (from the service library) to the onTap attribute. Install UrlLauncher as a Flutter package before using it below. import ‘package:flutter/material.dart’; import ‘package:flutter/services.dart’; import ‘package:url_launcher/url_launcher.dart’; void main() { runApp(new MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( … Read more
How to set the width and height of a button in Flutter?
As said in documentation here Raised buttons have a minimum size of 88.0 by 36.0 which can be overidden with ButtonTheme. You can do it like that ButtonTheme( minWidth: 200.0, height: 100.0, child: RaisedButton( onPressed: () {}, child: Text(“test”), ), );
Flutter: Expanded vs Flexible
Scaffold( appBar: AppBar(), body: Column( children: <Widget>[ Row( children: <Widget>[ buildExpanded(), buildFlexible(), ], ), Row( children: <Widget>[ buildExpanded(), buildExpanded(), ], ), Row( children: <Widget>[ buildFlexible(), buildFlexible(), ], ), ], ), );
How to change color of CircularProgressIndicator
This worked for me: CircularProgressIndicator(valueColor: AlwaysStoppedAnimation<Color>(Colors.white))
Programmatically scrolling to the end of a ListView
Screenshot: Scrolling with animation: final ScrollController _controller = ScrollController(); // This is what you’re looking for! void _scrollDown() { _controller.animateTo( _controller.position.maxScrollExtent, duration: Duration(seconds: 2), curve: Curves.fastOutSlowIn, ); } @override Widget build(BuildContext context) { return Scaffold( floatingActionButton: FloatingActionButton.small( onPressed: _scrollDown, child: Icon(Icons.arrow_downward), ), body: ListView.builder( controller: _controller, itemCount: 21, itemBuilder: (_, i) => ListTile(title: Text(‘Item $i’)), … Read more
Flutter: RenderBox was not laid out
The problem is that you are placing the ListView inside a Column/Row. The text in the exception gives a good explanation of the error. To avoid the error you need to provide a size to the ListView inside. I propose you this code that uses an Expanded to inform the horizontal size (maximum available) and … Read more
How to change the appBar back button color
You have to use the iconTheme property from the AppBar , like this: appBar: AppBar( iconTheme: IconThemeData( color: Colors.black, //change your color here ), title: Text(“Sample”), centerTitle: true, ), Or if you want to handle the back button by yourself. appBar: AppBar( leading: IconButton( icon: Icon(Icons.arrow_back, color: Colors.black), onPressed: () => Navigator.of(context).pop(), ), title: Text(“Sample”), … Read more
Check whether there is an Internet connection available on Flutter app
The connectivity plugin states in its docs that it only provides information if there is a network connection, but not if the network is connected to the Internet Note that on Android, this does not guarantee connection to Internet. For instance, the app might have wifi access but it might be a VPN or a … Read more
Space between Column’s children in Flutter
You can use Padding widget in between those two widget or wrap those widgets with Padding widget. Update SizedBox widget can be use in between two widget to add space between two widget and it makes code more readable than padding widget. Ex: Column( children: <Widget>[ Widget1(), SizedBox(height: 10), Widget2(), ], ),