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Questions tagged [statefulwidget]

339 questions
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how to Access TextEditingController of multiple same Stateful Widgets in flutter?

I am making an app where a user can add multiple stateful widgets in a list view inside a home stateful widget. Example: list of ingredients. Every ingredient widget has a TextFormField. A user can add as many ingredients as wish to and eventually…
Shrey Sharma
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How can I make separate color and button stateless and stateful classes for this code in flutter?

I would like to make an extra file 'extra.dart' where I would like to add my top container and the four TextButtonWidgets. 1 ColorWidget, 4 TextButtonWidgets with each one having colorwidget as their child. I would name the top container widget…
giannik28
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Can't get Flutter Countdown/Timer Widget to count down

I'm trying to create a simple widget which counts down from 10 upon getting built. I expected this to start counting down but it remains stuck on 10. Could anyone see what is going wrong here? class GameTimer extends StatefulWidget { const…
Jelle Huevo
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Flutter: How to Call a Function that is in a Stateful Widgets State Class, that depends on the initState, from another external Class

I am unsure if this question has been asked before, but I was unable to find an answer to it. I have a stateful widget for my signin page, which uses the flutter_toast package for error handling (incorrect password, email already in use, etc.). When…
noahfoe
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constructor doesn't work properly on flutter

I have create a class called Size Class name: Size enter code import 'package:flutter/material.dart'; import 'package:firstapp/pages/components/font.dart'; // ignore: must_be_immutable class Size extends StatefulWidget { double font =…
ኸይሩ ነጅሙ
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How to update widget tree from another widget class - Flutter

I am facing problem to re-render the page when a variable changes in one class/widget (both parent and child widgets are stateful classes). Here is how it goes: I have three buttons in one class which changes a variable state (foodCategory). int…
Bakhtawar
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How to execute function when a variable is not null Flutter

I have this code in _MyAppState in my main.dart : var _p3provider; @override void initState() { super.initState(); P3provider p3provider = new P3provider(); authentification(p3provider); _p3provider =…
JS1
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Flutter: setState() called in constructor

I am novice in Flutter, and ran upon a problem trying to show a map and implement some tilelayers. The app has a Drawer implemtation where I want to enable/disable and clear the tile cache. I have fetched some examples where this was working well,…
Roar Grønmo
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How to make a sparkline stateful widget to add new points along the time in flutter?

I have a stateful widget that draws a one from a list of points stored locally: class Sparkline extends StatefulWidget { @override _Sparkline create() => _Sparkline; } class _Sparkline extends State { List _points =…
Stéphane de Luca
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Flutter streambuilder does not update a statefulwidget or statelesswidget

I'm trying to build a streambuilder. My problem is that the streambuilder does not update other statefulWidgets inside the streambuilder widget. Here my code: class ChatPage extends StatefulWidget { //pass parm var chat_object; …
user16754196
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Flutter: Update children state from change in parent

NOTE: The code may seem very long, but for this question you don't need to understand every part of it. I have an app, which gets data from an API to build a chart with it. I use the Syncfusion cartesian chart package. This is an economic indicator,…
Matías Baeza Graf
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Read TextField input and show as a Text widget in Flutter

I am trying to implement an UI as below. App UI figure User types his name in the TextField widget and press the button. His name will show as a text widget below the button. I know the StatefulWidget should be used to rebuild the text widget for…
Henry
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How to send stateful widget data in flutter?

class Body extends StatefulWidget { int? pageIdx; Body({@required this.pageIdx}); @override State createState() => _MainContetns(pageIdx: pageIdx); } class _MainContetns extends State { int? pageIdx; …
Sanghun Yang
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How to update UI after PopupMenuItem is dismissed in flutter

I have an issue with updating the UI right after popupmenu is dismissed. The item being clicked actually is being deleted but updating it is the problem. I understand that I am calling this method from an unstatefull class that extends…
Davis
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flutter:: Is it possible to load statefulwidget as a second page?

I have main.dart, a.dart and b.dart. When I run main.dart, the results of a and b are all displayed in one page. But I want the results of a and b to be displayed on different pages. So I used MaterialPageRoute to make a visible on the first page…
lele
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