RecyclerView itemClickListener in Kotlin [closed]

Answer 1

You could try something like:

public class MainActivity : ActionBarActivity() {
    protected override fun onCreate(savedInstanceState: Bundle?) {
        [...]
        val adapter = DrawAdapter(::onItemClick)
        [...]
    }
}

fun onItemClick(view: View, position: Int) {
    //Do work
}

and SAM convertion just works like in Java 8, so just use a lambda:

public class MainActivity : ActionBarActivity() {
    protected override fun onCreate(savedInstanceState: Bundle?) {
        [...]
        val adapter = DrawAdapter({view, position -> /*Do work*/ })
        [...]
    }
}

Answer 2

Slightly different, based on denwehrle

To use on a fragment, inside OnCreateView

 adapter.onItemClick = {it ->
    //do something
 }

Add in the adapter class:

var onItemClick: ((Contact)->Unit) ?= null
...

inner class contactViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){
        val myItemView: TextView = itemView.findViewById(R.id.textView)

        init{
            itemView.setOnClickListener {
                onItemClick?.invoke(contact[adapterPosition])
            }
        }
}

Answer 3

Updated in 05 - 2019

I think the most elegant solution is to give this responsibility to recyclerView and not to view or even adapt it.

for that we need:

1: Create RecyclerItemClickListener file

class RecyclerItemClickListener(
        private val mRecycler: RecyclerView,
        private val clickListener: ((position: Int, view: View) -> Unit)? = null,
        private val longClickListener: ((position: Int, view: View) -> Unit)? = null
) : RecyclerView.OnChildAttachStateChangeListener {

    override fun onChildViewDetachedFromWindow(view: View) {
        view.setOnClickListener(null)
        view.setOnLongClickListener(null)
    }

    override fun onChildViewAttachedToWindow(view: View) {
        view.setOnClickListener { v -> setOnChildAttachedToWindow(v) }
    }

    private fun setOnChildAttachedToWindow(v: View?) {
        if (v != null) {
            val position = mRecycler.getChildLayoutPosition(v)
            if (position >= 0) {
                clickListener?.invoke(position, v)
                longClickListener?.invoke(position, v)
            }
        }
    }
}

2: Create/Add extensions for RecyclerView:

import android.support.v7.widget.RecyclerView
import com.app.manager.internal.common.RecyclerItemClickListener
                    
@JvmOverloads
fun RecyclerView.affectOnItemClicks(onClick: ((position: Int, view: View) -> Unit)? = null, onLongClick: ((position: Int, view: View) -> Unit)? = null) {
    this.addOnChildAttachStateChangeListener(RecyclerItemClickListener(this, onClick, onLongClick))
}

3: And finally the use (i suppose you use kotlinx)

import kotlinx.android.synthetic.main.{your_layout_name}.*

class FragmentName : Fragment() {

    override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
        recycler.affectOnItemClick { position, view -> /*todo*/ }
    }
}

Answer 4

3 easy steps:

1. pass in argument of your adapter as follow:

class ListAdapter(private val mListener: (ListItemDataClass) -> Unit)

2. in onBindViewHolder function, use like this

override fun onBindViewHolder(holder: YourViewHolder, position: Int) {

    val item = getItem(position)

    holder.itemView.setOnClickListener {
            item?.let { it1 -> mListener.invoke(it1) }
    }
}

3. and in your activity, use like this

val adapter = ListAdapter {
        Toast.makeText(this, it.title, Toast.LENGTH_SHORT).show()
}

Answer 5

OH what the heck someone might like this We all place edit and trashcan images in out recyclerview and would like something to happen when they are clicked. Here is our Kotlin example

This is in a card view that is inflated in the Adapter

    <RelativeLayout
    android:id="@+id/editCLICK"
    android:layout_width="60dp"
    android:layout_height="60dp"
    android:layout_marginStart="370dp"
    android:paddingLeft="6dp"
    android:paddingRight="6dp"
    android:paddingTop="12dp">

    <ImageView
        android:id="@+id/ivEdit"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@color/color_Transparent"
        android:src="@drawable/ic_edit"
        android:tint="@color/color_lightBlue" />

</RelativeLayout>

then in the Adapter we do some binding

    override fun onBindViewHolder(holder: ParentViewHolder, position: Int) {
    val items = parentList[position]
    holder.item.text = items.dept


    holder.editCLICK.setOnClickListener {
        val i = Intent(context, EnterParentActivity::class.java)
        i.putExtra("FROM", "U")
        i.putExtra("MainActId",items.idD)
        i.putExtra("PFK",items.fkD)
        i.putExtra("ET",items.dept)
        i.flags = Intent.FLAG_ACTIVITY_NEW_TASK
        context.startActivity(i)
    }
}


inner class ParentViewHolder(view: View):RecyclerView.ViewHolder(view){
    var item: TextView = view.findViewById(R.id.tvDept) as TextView
    var editCLICK: RelativeLayout = view.findViewById(R.id.editCLICK) as RelativeLayout
}

Simple quick and reliable enjoy

Answer 6

I have a little bit different approach. You can create an extension for your ViewHolder

fun <T : RecyclerView.ViewHolder> T.listen(event: (position: Int, type: Int) -> Unit): T {
    itemView.setOnClickListener {
        event.invoke(getAdapterPosition(), getItemViewType())
    }
    return this
}

Then use it in adapter like this

class MyAdapter : RecyclerView.Adapter<MyAdapter.MyViewHolder>() {

    val items: MutableList<String> = arrayListOf()

    override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): MyViewHolder? {
        val inflater = LayoutInflater.from(parent!!.getContext())
        val view = inflater.inflate(R.layout.item_view, parent, false)
        return MyViewHolder(view).listen { pos, type ->
            val item = items.get(pos)
            //TODO do other stuff here
        }
    }

    override fun onBindViewHolder(holder: MyViewHolder?, position: Int) {

    }

    override fun getItemCount(): Int {
        return items.size()
    }


    class MyViewHolder(view: View) : RecyclerView.ViewHolder(view) {

    }
}

I am working with my colleagues on library providing such extensions.