<@U6Y33L3ME> how to make this higher order lamda f...

# android

[jayant]

@edwardwongtl how to make this higher order lamda funtion without pass to constructor { (view, item) -> ... // binding } but i want to pass this in object but not in that constructor so i can use like this
adapter.onItemClick{position-> }

[miszmaniac]

Easy just override method

adapter.onItemClick() {
onItemClick?.invoke()
}

Add definition:

var onItemClick: ((Item) -> Unit)? = null

And override this property from outside

[edwardwongtl]

That's what I'm going to answer as well

[edwardwongtl]

But I would move to a field in adapter, and fun onItemClick(action: Int -> Unit) { listener = action }

[miszmaniac]

var onItemClick is property inside adapter, yeah

[jayant]

adapter.onItemClick() {
onItemClick?.invoke()
}

where to add this and how to assign that value?

[jayant]

how to use this in my attach file?

[edwardwongtl]

class Adapter(...): ... {
var listener: (Int -> Unit)? = null

fun onItemClick(action: Int -> Unit) { listener = action }

fun onBindViewHolder(...) {
...
holder.itemview.setOnClickerListener { listener?.invoke(holder.getAdapterPosition() }
}

[jayant]

adapterFeed?.apply {

}

[jayant]

in this how to get that onItemClick?

[edwardwongtl]

I don't understand what you want to ask

[jayant]

adapterFeed = AdapterFeed(instanceActBase()!!, getQArrayList)
rcvFeed.apply {
layoutManager = LinearLayoutManager(instanceActBase(), LinearLayoutManager.VERTICAL, false)
adapter = adapterFeed
}

adapterFeed?.apply {

}

[jayant]

this is my code but how to use onItemCLick ?

[miszmaniac]

adapterFeed.onItemClick = {item -> ….}

[miszmaniac]

just pass lambda inside adapter and you’re good to go

[jayant]

thank you @miszmaniac

[miszmaniac]

and as @edwardwongtl said don’t pass position inside lambda resolve item before using

getItem(position)

[jayant]

what happen if i want to pass position to that lamda?

[edwardwongtl]

You should use holder.getAdapterPosition() to get the actual position

[miszmaniac]

item might change before you finish this lambda

[jayant]

ok

[jayant]

please explain how to work that while using position?

[jayant]

thanks for you co-operate @edwardwongtl and @miszmaniac

[miszmaniac]

np! Have fun!

[jayant]

from how long you have to use kotlin ?

[miszmaniac]

2 years - firstly rewritten all tests in app, and later just migrated to kolin as base lang

[jayant]

nice

[edwardwongtl]

About half year for me

[jayant]

nice i just stated with kotlin and make 1 project