RecyclerView itemClickListener in Kotlin [closed]

Answer 1

You can easily achieve this by using an interface

class ExercisesAdapter constructor(val mItemClickListener:ItemClickListener) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    interface ItemClickListener{
        fun onItemClick(position: Int)
        fun onLongClick(position: Int)
    }

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

        init {
            view.setOnClickListener{
                mItemClickListener.onItemClick(adapterPosition)
            }
            view.setOnLongClickListener{
                mItemClickListener.onLongClick(adapterPosition)
                return@setOnLongClickListener true
            }
        }
    }
}

From your MainActivity

public class MainActivity : ActionBarActivity(), ExercisesAdapter.ItemClickListener {

   protected override fun onCreate(savedInstanceState: Bundle?) {

    // set content view etc go above this line
    mAdapter = ExercisesAdapter(this)
   }

   override fun onItemClick(position: Int) {
        Toast.makeText(this@MainActivity, "TEST: " + position, Toast.LENGTH_SHORT).show()
    }

    override fun onLongClick(position: Int) {
        //do long click here
    }
}

Answer 2

In case anyone is looking for a more no-frills answer, I tried the following - which is very similar to the solution from AfzalivE:

In my Adapter class I passed the clickListener as a parameter. On onBindViewHolder, I've used setOnClickListener to call clickListener and handle click event.

MyAdapter.kt:

class MyAdapter constructor(objects: ArrayList<MyObject>, val clickListener: (MyObject) -> Unit) : RecyclerView.Adapter<MyAdapter.Holder>() {

    private var mObjects : ArrayList<MyObject> = ArrayList<MyObject>()

    init {
        mObjects = objects
    }

    override fun onBindViewHolder(holder: Holder?, position: Int) {
        var item : MyObject = objects[position]

        // Calling the clickListener sent by the constructor
        holder?.containerView?.setOnClickListener { clickListener(item) }
    }

    // More code (ViewHolder definitions and stuff)...

}

Note: I needed a reference from my list item's container (the root view), which in this case is containerView

Then I passed my object as parameter without need for searching it on a list again and handle it directly on my Activity class, in the moment I set the adapter:

MyActivity.kt:

myRecyclerView?.adapter = MyAdapter(mObjects) {
    Log.e("Activity", "Clicked on item ${it.itemName}")
}  

---

Update

If you need to get the position of the clicked item, just define it as parameter on the callback and then send it back later. Notice the val clickListener: (MyObject, Int) -> Unit below:

MyAdapter.kt

class MyAdapter constructor(objects: ArrayList<MyObject>, val clickListener: (MyObject, Int) -> Unit) : RecyclerView.Adapter<MyAdapter.Holder>() {
    // Rest of the code...

Then on onBindViewHolder() you pass the position when calling the callback method:

override fun onBindViewHolder(holder: Holder?, position: Int) {
    var item : MyObject = objects[position]

    // Calling the clickListener sent by the constructor
    holder?.containerView?.setOnClickListener { clickListener(item, position) }
}

And on MyActivity.kt, you'll have to change the way you set the adapter so you can get the position. Like this:

myRecyclerView?.adapter = MyAdapter(mObjects) { itemDto: MyObject, position: Int ->
        Log.e("MyActivity", "Clicked on item  ${itemDto.someItemPropertyLikeName} at position $position")
    }

Answer 3

My solution is like a combination of the previous ones with a super clean call from the activity.

ContactAdapter:

class ContactAdapter @Inject constructor() : RecyclerView.Adapter<ContactAdapter.ViewHolder>() {

    var onItemClick: ((Contact) -> Unit)? = null
    var contacts: List<Contact> = emptyList()

    ...

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val contact = contacts[position]

        holder.email.text = contact.email
    }

    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val email: TextView = itemView.email

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

ContactActivity:

override fun setupRecyclerAdapter() {
    recyclerView.adapter = contactAdapter
    recyclerView.layoutManager = LinearLayoutManager(this)

    contactAdapter.onItemClick = { contact ->

        // do something with your item
        Log.d("TAG", contact.email)
    }
}

Answer 4

In RecyclerView you can put click on inflated view inside ViewHolder class and call it from onBindViewHolder callback method for example:

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

    val view = view
    val tv_message = view.tv_message
    val tv_address = view.tv_address

    fun bind(listViewItem: ListViewItem) {
        view.setOnClickListener(View.OnClickListener {

            Toast.makeText(
                view.context, 
                "Name: " + listViewItem.name + "/n Address: " + listViewItem.address, 
                Toast.LENGTH_LONG).show()
            })
        }
    }
}

You can call from adapter onBindViewHolder() method:

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

    val listViewItem: ListViewItem = mListViewItems[position]
    holder.tv_message.text = listViewItem.name
    holder.tv_address.text = listViewItem.address
    holder.bind(mListViewItems[position]);
}

Answer 5

You don't need to write extension function to ViewHolder or something like this.
Best practice; use Higher-Order Function

MainRecyclerAdapter

class MainRecyclerAdapter(val news: JSONArray, private val itemClickListener: (Int) -> Unit) : RecyclerView.Adapter<MainRecyclerAdapter.ViewHolder>() {}

Just add a Higher-order func. like itemClickListener and then go to the ViewHolder class. Write this function to your bind function as parameter and set this to itemView Like that :

MainRecyclerAdapter.ViewHolder

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

        fun bind(newsItem: JSONObject,itemClickListener:(Int)->Unit) {
            //Some Stuff here..

            itemView.setOnClickListener { itemClickListener(adapterPosition) }

        }
    }

Use this method onBindViewHolder

OnBindViewHolder

 override fun onBindViewHolder(holder: MainRecyclerAdapter.ViewHolder, position: Int) {

        holder.bind(news.getJSONObject(position),itemClickListener)
    }

And now you can write your onClick function in any activity or fragments.. Just give as parameter.

Activity or Fragment

val itemOnClick: (Int) -> Unit = { position ->
                newsRecyclerView.adapter!!.notifyDataSetChanged()
                Toast.makeText(this.context,"$position. item clicked.",Toast.LENGTH_SHORT).show()
            }
 newsRecyclerView.adapter = MainRecyclerAdapter(news,itemClickListener = itemOnClick)

Answer 6

//Step 1 make an interface like

interface RecyclerViewClickListener {
    fun onItemClick(position: String)
    fun onLongClick(position: Int)
}

Step 2 Inside Adapter class pass one more argument as an interface like

class ModelAdapter(var item_list: ArrayList<UploadDocument>,var mItemClickListener:RecyclerViewClickListener) : RecyclerView.Adapter<ModelAdapter.ViewHolder>() {


override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ModelAdapter.ViewHolder {
    // create a new view

    val view = LayoutInflater.from(parent.context).inflate(R.layout.upload_document_row_item, null)

    // create ViewHolder

    return ViewHolder(view)
}

override fun onBindViewHolder(holder: ModelAdapter.ViewHolder, position: Int) {

    holder.txtRegistrationDoc?.setText(item_list[position].getdocName())
    holder.txtCertificate?.setText(item_list[position].getcertificateName())
    holder.txtFileSize?.setText(item_list[position].getfileSize())
    holder.txtCreatedOn?.setText(item_list[position].getcreatedOn())
    holder.txtModifiedOn?.setText(item_list[position].getModifiedDate())

    //holder.chkSelected.isChecked = item_list[position].isSelected()

    holder.chkSelected.tag = item_list[position].getdocName()


        holder. chkSelected!!.setOnCheckedChangeListener { buttonView, isChecked ->

            if(isChecked)
            {
                System.out.println("position>>>"+buttonView.tag.toString())
                mItemClickListener.onItemClick(buttonView.tag.toString())
            }

        }

    //(context as UploadDocumentActivity::class.java).onClickCalled("your argument here")

   /* holder.btn_delete.setOnClickListener(object : View.OnClickListener() {
        override fun onClick(v: View) {

            deleteItemFromList(v, position)


        }
    })*/

}

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


/*// confirmation dialog box to delete an unit
private fun deleteItemFromList(v: View, position: Int) {

    val builder = AlertDialog.Builder(v.getContext())

    //builder.setTitle("Dlete ");
    builder.setMessage("Delete Item ?")
        .setCancelable(false)
        .setPositiveButton("CONFIRM",
            DialogInterface.OnClickListener { dialog, id ->
                item_list.remove(position)
                notifyDataSetChanged()
            })
        .setNegativeButton("CANCEL", DialogInterface.OnClickListener { dialog, id -> })

    builder.show()

}*/


class ViewHolder(
    itemLayoutView: View) : RecyclerView.ViewHolder(itemLayoutView) {

    var item_name: TextView
    var txtRegistrationDoc: TextViewNormal?=null
    var txtCertificate: TextViewNormal?=null
    var txtFileSize: TextViewNormal?=null
    var txtCreatedOn: TextViewNormal?=null
    var txtModifiedOn: TextViewNormal?=null
    var chkSelected: CheckBox


    init {

        item_name = itemLayoutView.findViewById(R.id.txt_Name)
        txtRegistrationDoc = itemLayoutView.findViewById(R.id.txtRegistrationDoc)
        txtCertificate = itemLayoutView.findViewById(R.id.txtCertificate)
        txtFileSize = itemLayoutView.findViewById(R.id.txtFileSize)
        txtCreatedOn = itemLayoutView.findViewById(R.id.txtCreatedOn)
        txtModifiedOn = itemLayoutView.findViewById(R.id.txtModifiedOn)
        //btn_delete = itemLayoutView.findViewById(R.id.btn_delete_unit)
        chkSelected = itemLayoutView.findViewById(R.id.chk_selected)


    }



}
}

//Step 3 Inside your activity/ Frgament

recyclerView?.adapter = ModelAdapter(documentList,object : `in`.mobilepedia.com.gicgwaliarincubationcentre.RecyclerViewClickListener
        {
            override fun onItemClick(position: String) {

            System.out.println("Position>>>>>"+position)
        }

        override fun onLongClick(position: Int) {

        }

    })