Recycler | C container that recycle object allocated with std

I want to choose multiple media (videos or images) from gallery on clicking a button, but only, after showing all the media from the gallery in activity of my app only, (without opening my phone default gallery) & then, show them in the Recycler View (grid view).

Then, selecting images of Videos from them. I am a beginner in android, also haven't find any help from other resources. Please guide me in the same & provide a proper solution.

Hey I am working in android. I want to fit children in whole view of recyclerview android. I have horizontal recylerview. I will show what I want in diagram.

Scenario 1

when I have more item in recyclerview, I want to show children like this in my recycler view.

Expected Output

Scenario 2

when I have three item I want to show like this. It will fill whole view in reyclerview.

Expected Output

Scenario 3

When I have Two item in reyclerview, I need to look like this

Expected Output

The problem I am getting that I have 3 item, the view is not filling fully. Actually I want to stretch whole view to full width like Scenario 2.

Actual output

item_layout.xml

My List doesn't seem to be getting initialised and I'm not really sure what I should be doing here, everytime I run I get:

I would like to ask for help on how to retrieve data from Firestore for nested Array of Maps called "cities" into MutableList , which I then want to insert into recycler view, where the data from the “regions” are for the header and data “cities” for the regular list items.

Data for regions: MutableList , when I follow the procedure https://medium.com/firebase-tips-tricks/how-to-map-an-array-of-objects-from-cloud-firestore-to-a-list -of-objects-122e579eae10 by Alex Mamo, got fine, but data for: cities: MutableList , according same approach, is null (unable to retrive).

Can you please advise how to get data for “cities”?

P.s. somewhere I read the recommendation to iterate over "cities", but I have no idea how, please go straight for an example (ideally in Kontlin).

Code:

I had a bit of trouble figuring out how to word this one when researching so I've made a quick mockup of what I'm trying to achieve below. my app has a persistent bottom sheet and I would like the contents of the sheet to be resized based on whether the sheet is expanded or half expanded.

My sheet consists of a recycler view and a view at the bottom with some buttons. Currently, the contents of the sheet are always sized as though the sheet is full expanded. This means that the buttons are not displayed unless the sheet is fully expanded and much of the recycler view is also hidden behind the cropped-off sheet. What I want to happen is for the buttons to always be displayed at the bottom of the sheet, even when said sheet is half expanded, and for the recyclerview to fill whatever space is left. Is this possible in a persistent bottom sheet and if now, what means should I use to achieve this? And help would be greatly appreciated.

I'm stuck by a problem and I don't know how too resolve it. I want to click on my item in my recycler view, and at this click the layout with the recylcer view will be closed, and my mainActivity will be refresh with the data of the item who i have click on.

I am working on an idea, which is make a RecyclerView auto scrolling but allow user to click item without stop scrolling.

First, I create a custom LayoutManager to disable manual scroll, also change the speed of scroll to a certain position

i don't know much about java, just started, so i will have difficulties understanding the answers. emli5.

screenshot:

expected output:

in the recyclerview (right), these items are not aligning up like i want them to.

I want that each cell has a fixed size, and maximum number of columns possible in the grid. spacing b/w each cell (both vertical and horizontal) is equal to (left space) divided by (number of columns minus one). [with no extra space left at start, top, bottom or end]

here is the code:

I have an application that's supposed to open a popup dialog when the user clicks on the item but crashes when clicked. It started crashing as I added the (this as AppCompatActivity).supportFragmentManager line. Heres the code for the adapter pls help!!