ListFragment | Ssimple fragments example

I've simple view, fragment container button on the bottom side. I've used guidline horizontal and now I've margin on the top and on the bottom of buttons. I don't see this margins in the code, so why I've this margins and how to remove it ?

I'm trying to use Activity and fragments using Navigation Jetback library and following a course which used FragmentFactory with that but I got a crash unable to start activty cause by this

Hey and sorry for my bad English...

I have a ListView in my ListFragment with a custom Adapter. In my Layout I have an Button. The Button and the whole item/row is clickable. I made that happen with android:clickable="false" for the ImageButton. As you can see in the getView() method, I catch a click action.

I am creating a simple FragmentList App, but for some reason I keep getting the error:

When the 'Add Customer' Button is pressed in MainActivity.kt a new Activity is started for Result, CustomerActivity.kt. CustomerActivity opens up Fragment (ListFragment.kt) which contains a list of all the Customers in the Room Database.

When a Customer is clicked on, another Fragment is opened. In UpdateFragment.kt, all the customers information is displayed and a button "Choose Customer". Once clicked, an Intent is created and the Customers information is added to the Intent. The Main Activity is opened again and with it the selected customer information passed in the intent.

How can I open the Intent for its information from UpdateFragment.kt in MainActivity.kt? And gain access to the customer information that was passed with the intent? Currently I am able to create an intent with the customer information in UpdateFragment.kt and open MainActivity.kt but I do not know how to access the intent in MainActivity.

MainActivity.kt

I have Activity(BottomBar) - Fragment(RecyclerView) - FragmentAdapter(RecyclerView Adapter)

1. RecyclerView show list.
2. bottomBar visible when I clicked item one of the list.
3. I clicked item in bottomBar(ex.delete) -> I want to access FragmentAdapter and notify item delete or something --> but when I call FragmentAdapter, it is null

Activity

I'm trying to add a ripple effect for the entire row (like we see in listview) in my Recycler View when the row is clicked.

I have tried

I'm newby in Kotlin and need to re-write the following Java class to Kotlin, and can't figure it out how to implement it.

I am working on my first rather big project in android studio and I've been struggling for the past three days with this:

My app has a bottom navigation component that opens 3 other fragments and I was wondering how I could implement a ListView into one of those 3 fragments. I managed to put the ListView in the main layout (activity_main.xml), but as soon as I put the ListView into a layout that's not the main layout I get an NPE. I guess that's because if I try to link the ListView to its data with findViewById(R.id.ListView) it's looking for ListView in activity_main. The code that tries to link the ListView to the component in the layout-file is written in the onCreate in the mainActivity.java. How can I tell the programm to look for the ListView in layout_With_List.xml?

I read on another question that I need to change the setContentView(R.layout.activity_main) in onCreate to setContentView(R.layout.layout_With_List), but that just creates another error.

So how can I properly put a ListView into another fragment, so it won't float around in the main layout when I change tabs with the bottom navigation AND make it display data?

The error i'm getting: