swipecards | Tinder-like swipe control for Xamarin.Forms | Form library

When I create a new fragment in Android Studio by clicking:

and then choosing Kotlin as language for the new fragment, I get following warning that I have to implement two members or make the class abstract. When I make it abstract the program doesn't start, because it can't instanciate the abstract class. When I implement the methods I don't know what I have to put into them and the program doesn't start with the error that they don't override anything:

When I create the Fragment in Java it works, I don't understand it. Here is how I call the fragment from the activity:

Copied java code from diolor/swipecards (GITHUB). Converted it into kotlin with help pf online tools. It had some errors which were corrected but this last one still appears (findViewById) in the OnScroll function.

I have a list of strings that form an item menu created horizontally:

I created a list of item that are scrollable horizontally, and I am trying to render different widgets depending on what button is pressed. The widgets are created in different and independent files. What I need to achieve is to import them widgets depending on what button is pressed. For example, that the widget of "DropDown" is rendered when the button of "DropDown" is pressed on the list. The screen is the following:

Here is the code of the buttons list and where I should import the widgets:

I am trying to have a scrollable horitzontal list in one of my App screens done but flutter, but I am getting the following error:

The argument type 'dynamic' can't be assigned to the parameter type 'String'.

Here is the code:

class CategoryListState extends State {

I'm not getting autofill suggestions anymore in my XML files. I'm not sure what I did. I think it has to do something with my Gradle file but unable to pinpoint. As I understand it, the "xmlns:tools="http://schemas.android.com/tools" is where that comes from. I think the problem could be that I am using material buttons and app compat or something like that. I have resynced the Gradle multiple times as well. Usually, I could type something in like "wi" and it would show a drop-down menu with a bunch of suggestions. Can anyone spot the problem?

Gradle:

I have a Collection of Documents and Im trying to get each Documents field "Name" into a card stack. The Collection is call "Users" and Documents are "userId". Each Document contains the field "Name" and "Gender" of that user. So far iv been able to get the currently signed in user's name to the card stack but am having issues getting the other users in the database to the stack. Here is the code Im using.Not getting any errors in the Logcat or experiencing any crashes.The data is just not being added. Any suggestions?

I'm developing an app like tinder using this swipe card https://github.com/Diolor/Swipecards . I made a custom adapter which set data to swipecard. everything is fine i checked logcat where data printing. i checked logcat of getItemCount(). it showing data's size. my problem is data not showing in the swipecard.

Update

In this code there are two methods

1. getPeople() which is working perfectly, showing data to the swipe cards.

2. getNearbyPeople which is also working but data not showing in the swipe cards. both the methods using same codes and adapter. sometimes its shows data but takes too long time almost half an hour. one is working and another one doesn't. hope you understand what i said. thanks in advance.

All codes are below

MainActivity.class

How would I go about displaying multiple images the way Tinder does it: it should display the next image when I click on the right side of the image and display the previous image when I click on the left side of the image.

It should also display a little arrow to the right or left only when clicked and show somehow which picture is being displayed (with little bars like tinder or dots or something).

Is there a library for that?

EDIT: To clarify: I already implemented the Tinder swipe-cards with the help of the Diolor/Swipecards library. What I'm suprisingly a little stuck with is implementing the image gallery INSIDE the Tinder swipecards. Only the part seen in the picture above.