Issues with Flutter state

<strong>This is an experiment with Flutter</strong>. I was trying to create a paragraph generator in Flutter. Made a UI <a href="https://i.stack.imgur.com/E9wt...

How to solve this error: The method [] was called on null. Receiver: null Tried calling: [](name)

Basically, I want to display info admin in the section drawer. So I user <code>StreamBuilder</code>. Then I got an error inline <code>StreamBuilder&lt;DocumentS...

Newbie question related to Flutter StatefulWidget

I just started using Flutter, and was testing the sample counter app created with flutter create counter First thing I wanted to try, was to move th...

Flutter InkWell Widget is rendering on Emulator but not on Web Browser

I am using the flutter InkWell widget inside GridView to layout a grid of 30 Cards to show different levels. While it is working perfectly fine on mobile devices while...

Flutter: combining stateful widgets into a flutter-redux app architecture

Following <a href="https://stackoverflow.com/questions/54173071/does-stateful-widgets-make-sense-in-a-redux-flutter-app">this</a> question, I understand why <strong>St...

Flutter - Vertical viewport was given unbounded height

I want to write the available devices under the image that is shown like this: <a href="https://i.stack.imgur.com/QrNx4.png" rel="nofollow noreferrer"><img src="https:...

Flutter: single child scroll view is not working within positioned widget

Here is an image of the component that I am trying to make scrollable: <img src="https://i.stack.imgur.com/pMPxZ.png" alt="component displaying Following w...

Flutter: inherit from abstract stateless widget

I have a class that has to take a custom widget. This one can have two different implementations, so I would like to have an abstract class as interface and create two...

DART/FLUTTER: How to get access to member variable / values of Widgets

I have an list of widgets. The widgets are background images for a website. The last widget(image) in this list is displayed onscreen. As nav functions push/pop, the l...

Value property doesnt update for dropdownfield when I do setState in flutter

I am updating the dropdown table dynamically from an API. When I select an hour, the corresponding subjects are retrieved from the API. Let's say I am switchin...

How to Obx in RxStatus.success() function

I use CheckboxListTile to input checkbox. this is a function to retrieve a list of data from firestore <pre><code> void initDoctorCategory() { DoctorCa...

How to show/hide widgets programmatically in Flutter

In Android, every single <code>View</code> subclass has a <code>setVisibility()</code> method that allows you modify the visibility of a <code>View</code> object...

Flutter - Custom Widget - How to obtain a value from

This is a simple example of the problem that I have. Given the following example, how can I obtain the value of "counter" from outside the Class? <pre><code>class...

Drag a container vertically up and down to a certain level flutter

I am new to gestures and I don't get any proper solution for achieving my request, Can anyone help me in dragging a container up and down vertically to a certain point...

stateless widget vs stateful widget performance

What would happen if we converted a stateless widget to a stateful widget? Is there any performance issue?