How to Modify Only First Nested RecyclerView (child) element at Position 0 of Parent RecyclerView?

Question

I have parentRecyclerview that includes a nestedRecyclerview. nestedRecyclerView lists several items: (Apple, Banana, Pear). I want to bold the first item (apple) of this nestedRecyclerview like so:

**Apple**
Banana
Pear

-------

Apple
Banana
Pear

-------

Apple
Banana
Pear

I can get it to bold the first item of each nested recyclerview list by doing:

when (position) {
0 -> 
// code to make apple bold
}

but that gives me:

**Apple**
Banana
Pear

-------

**Apple**
Banana
Pear

-------

**Appla**
Banana
Pear

How do I go about this? I would add all my code, but honestly it is a ton of code and much more complex that apples, bananas, pears. I prefer code in Kotlin, but I can figure out Java if thats what you know. Thanks!

Lots of internet searching done, but most talk about onClickListener events.

Answer 1

try using this create variable to manage bold of view based on position

class NestedAdapter(...) {
private var topItemBold = false

override fun onBindViewHolder(holder: NestedViewHolder, position: Int) {
    val item = items[position]

    if (topItemBold && position == 0) {
        holder.textView.setTypeface(null, Typeface.BOLD)
    } else {
        holder.textView.setTypeface(null, Typeface.NORMAL)
    }

    // ... rest of your binding logic
}

and update your parent adapter like this

class ParentAdapter(...) {
override fun onBindViewHolder(holder: ParentViewHolder, position: Int) {

    val nestedAdapter = holder.nestedRecyclerView.adapter as NestedAdapter

    if (position == 0) {
        nestedAdapter.topItemBold = true
    } else {
        nestedAdapter.topItemBold = false
    }
}

so in above our topItemBold only true for first item on nested view on first item of parent list