I have a function which returns an object of `View...

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[Chung]

I have a function which returns an object of ViewHolder

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    return when (viewType) {
        0 -> ViewHolder(CategoryHeaderBinding.inflate(LayoutInflater.from(parent.context), parent,false))


        else -> ViewHolder(CategoryCardBinding.inflate(LayoutInflater.from(parent.context), parent, false))
    }
}

it passes either CategoryHeaderBinding or CategoryCardBinding to ViewHolder

class ViewHolder(private val binding: CategoryCardBinding OR CategoryHeaderBinding) :
        RecyclerView.ViewHolder(binding.root) {
    }

How do I make ViewHolder accepts binding to be either CategoryCardBinding or CategoryHeaderBinding

[Chilli]

I think you'll need to either have two functions, for each of the types or to have some kind of class containing one of those two types. Or you could also add a common interface for those two classes

[Chung]

Does it matter if onCreateViewHolder expecting a ViewHolder return type?

[rax]

What are you doing with the binding?
Are you just setting variables in binding?

[Chung]

the binding is for

fun bind(subcategory: Subcategory) {
    binding.subcategory = subcategory
}

fun bind(brand: Brand) {
    binding.brand = brand
}

basically binding allows me to update something

[Chung]

the bind function is inside ViewHolder

[rax]

then you can do this:

class MyViewHolder(private val binding: ViewDataBinding): RecyclerView.ViewHolder(binding.root) {
    fun bind(subcategory: Subcategory) {
        binding.setVariable(BR.subcategory, subcategory)
        binding.executePendingBindings()
    }

    fun bind(brand: Brand) {
        binding.setVariable(BR.brand, brand)
        binding.executePendingBindings()
    }
}

• ViewDataBinding.setVariable will set variable if it exists in the layout.
• BR here is <your.package.name>.BR

[rax]

For reference, check this out: https://medium.com/androiddevelopers/android-data-binding-recyclerview-db7c40d9f0e4

[Chung]

Thank you very much 💯