ExpandableView | ExpandableView for easy collasping/expanding

i am trying to create custom view like below here i am trying to bind a collection from main page to custom view

but here it is not binding properly.

Hello I have a problem with setting the visibility of the cardView part.

I am using Android Studio to create 2 CardViews that expand and collapse on a mouseclick. However, when I expand a card, the card underneath does not get pushed down and still visible even if the card above is expanded and is an overlap problem. How do i fix this so either the card below the one being expanded gets pushed down or that the card that is being expanded information is at the front?

Screenshot of how cards look before clicked:Before Clicked

screenshot of when when clicked: when clicked (as you can see the 'Steven Smith card is still being shown)

Note: I did look into using a Recycler View + adapter etc. but in each card I would want different layouts/images (vs all being consistent info like a contact in someones phone)

Here is my java code:

I create a custom view to use in layouts and need to set a default value for its properties.

My view actually works almost perfect, but need default properties for better usability.

I've created my own ExpandableView based on this https://www.clearpeople.com/insights/blog/2019/February/how-to-create-a-contentview-with-expandable-functionality but as all C# code.

My control looks like this (without the animation part)

I want to add a custom view in TableViewHeader. But when I run the following code it creates a Cycle and app stuck for any user interaction.

I have a big problem deleting a group from an ExpandableListView. Even after google a lot and trying a lot of tutorials and examples I was not able to solve it.

Though I have a lot of programming experiences I am relative knew to Android programming. So I am sure there are many things in the source which are not yet well done. But as of now I wanted to focus on the problem with a wrong view after deleting a group from the list.

To give a good overview to the problem here are some screenshots

Start of the App

List after click to the button List All Budgets

All Groups Expandet

Before delete the last child of the last group

Remaining group show children twice

Last group this time with two children

Before deleting the last children of the last group

Correct result after deleting last child of last group

I hope the problem becomes clear. If the last group has only one child and this was deleted the whole group will be deleted by the app - but than the children of the first group show up twice.

During a debugging session I checked all the ressources behind the data and they are all ok. If I go back to MainActivity and start the list again the view ist totally correct. So it must be a problem of an incorrect population after deleting a whole group.

As you can see if I only delete the last child from a last group with two childs the populating of the whole list is correct.

Here are some more information about the app:

• I use a room database with two tables holding the data.

  One tabel contains the categories with name and id and the other tabel is for single budget records with the category id as an foreign key

In onCreate of the BudgetListActivity I created two DAO's budgetDAO and categoryDAO to get the data and fill the lists allBudgetsList and all CatList. With this informations I create a new array List allGroups with the structure I need for the view - Categories as header - budgets as children due to the foreign key

(just one remark here: meanwhile I tried already using a hashmap for the data given to the ExpandableListAdapter - but the result was the same wrong view population!)

There is a contentView "budget_expandable_list" which is set to the ExpandableListAdapter. The adapter should populate the groups and childs for this list using the data from the ArrayList "allGroups"

This is the structure of the app

It could be that there are some ressources which are not used actually.

I will give now the soure code for the importand classes

BudgetListActivity:

Inside my app I'm animating the height constraint of a view and when the height constraint changes the view does translate for a while a little bit down despite I set the constraint to the top as 0. Here's the code I used to animate the change:

I'm creating a custom class to make a view expandable; the class works with a UIPanGestureRecognizer that modifies the view's height constraints. While debugging the code I used the following code to show the height constraints associated with the view.