ExpansionPanel | Expansion panels contain creation flows and allow | Android library

a beginner in a field, I have this code that works, but there is an error in the case of clicking When I click on any card, all cards also open. I want to open a card that I just click on

I searched for a long time on the Internet how to solve this error but did not find it.I tried to do a search as written here, but I did not find anything, maybe because I do not understand how to use it. What is this error? How to solve it? Help me pls. P.S. Any necessary files or additional information I can add.

Duplicate class androidx.lifecycle.DefaultLifecycleObserver found in modules lifecycle-common-2.4.0.jar (androidx.lifecycle:lifecycle-common:2.4.0) and lifecycle-common-java8-2.3.0.jar (androidx.lifecycle:lifecycle-common-java8:2.3.0)

i am trying to toggle the each list in the expanded panel list by tapping on each header on this list. bellow is my code, and i don't know if its possible to achieve that by adding ontap or onpressed function. thank you.

please what am i doing wrong here. i am trying to have a listview in an expanded panel list and if i rendered just two expanded list the code runs with no error. but if i rendered more than two, and i try to expand any of the other panel list, it returns the following error as RangeError (RangeError (index): Invalid value: Not in inclusive range 0..1: 2.

bellow is my code sample. thank you all.

I'm trying to render a container and an expanded panel list together in a single page. Bellow is my code snippet. Thank you all

please is there a way i can make a list items in an expanded panel scrollable. i tried to achieved that in the bellow code but i am getting bottom overflow error when i expand the first panel . thanks

I'm trying to build a Data Table variant so that the row can be expanded with extra information. I didn't found a way to do this with the DataTable class.

This is what I have:

Im trying to convert my existing iOS Application into Flutter.

In iOS I'm using UICollectionViewDiffableDataSource to view a structure like that:

I have an expansion panel in _buildCategoryListings() that does not expand when the header or the dropdown button is clicked. isExpanded is set to the boolean categoryView.isExpanded. Through printing via the console I can see that the setState is actually updating the bool value but it looks like the actual widget isn't being redrawn perhaps? If I manually set isExpanded to true I see the results I want from the GUI. I also had set isExtended to theExpanded (which is in MovieListingView) which raises the issue of a mutable variable being in a class that extends StatefulWidget, this did give me the desired results though.

The question: How do I get the expansion panel to update the categoryView.isExpanded (via theListings[panelIndex].isExpanded) bool and show it via the GUI?

Thank you in advance.

Side note I thought about using a provider to keep track of this bool but that seems like overkill.