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How to Create Options Menu for RecyclerView in Android using Kotlin?
  • Last Updated : 24 Mar, 2021

RecyclerView is a ViewGroup added to the android studio as a successor of the GridView and ListView. It is an improvement on both of them and can be found in the latest v-7 support packages. It has been created to make possible construction of any lists with XML layouts as an item that can be customized vastly while improving the efficiency of ListViews and GridViews. This improvement is achieved by recycling the views which are out of the visibility of the user. For example, if a user scrolled down to a position where items 4 and 5 are visible; items 1, 2, and 3 would be cleared from the memory to reduce memory consumption. In this article, we will explain how to use the Options menu in each item of the RecyclerView. Below is the sample video to show what we are going to build. Note that we are going to implement this project using the Kotlin language. 

Step by Step Implementation

Step 1: Create a new project

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Kotlin as the programming language.

Step 2: Add view binding dependency

Go to build.gradle(app) and the following dependency inside the android tag and click sync now.



buildFeatures {

      viewBinding true

  }

Step 3: Working with the activity_main.xml file

Go to the activity_main.xml file and refer to the following code. Below is the code for the activity_main.xml file. It has only a single Recycler view which we will use to show our data.

XML




<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:background="#F5F8FD"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
      
    <!--Add recycler view to main activity-->
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:listitem="@layout/single_item"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />
  
</androidx.constraintlayout.widget.ConstraintLayout>

Step 4: Create a new layout file and name it a single_item.xml file

Go to the single_item.xml file and refer to the following code. Below is the code for the single_item.xml file. It is the single item layout that we will use in RecyclerView.



XML




<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.card.MaterialCardView 
    android:layout_width="match_parent"
    android:layout_marginBottom="10dp"
    android:layout_marginStart="5dp"
    android:layout_marginEnd="5dp"
    android:layout_height="110dp">
  
    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        
        <!--Add image view, We will not set any data here.-->
        <ImageView
            android:id="@+id/iv_language"
            android:layout_width="90dp"
            android:layout_height="90dp"
            android:layout_marginStart="20dp"
            android:layout_marginTop="10dp"
            android:scaleType="fitCenter"
            android:src="@mipmap/ic_launcher"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
        
        <!--Text view for showing the language name-->
        <TextView
            android:id="@+id/tv_lang_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="30dp"
            android:layout_marginTop="20dp"
            android:text="Language"
            android:textSize="20sp"
            android:textColor="@color/black"
            android:textStyle="bold"
            app:layout_constraintLeft_toRightOf="@id/iv_language"
            app:layout_constraintTop_toTopOf="parent" />
        
        <!--Text view fr showing exp-->
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toBottomOf="@id/tv_lang_name"
            app:layout_constraintLeft_toLeftOf="@id/tv_lang_name"
            android:text="1 Year exp"
            android:id="@+id/tv_exp"
            android:textSize="16sp"
            android:layout_marginTop="15dp"/>
        
        <!--Text view for showing the options menu-->
        <TextView
            android:id="@+id/textViewOptions"
            android:layout_width="20dp"
            android:gravity="center"
            android:layout_height="30dp"
            android:layout_alignParentTop="true"
            android:textStyle="bold"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_margin="20dp"
            android:text="⋮"
            android:textAppearance="?android:textAppearanceLarge" />
          
    </androidx.constraintlayout.widget.ConstraintLayout>
  
</com.google.android.material.card.MaterialCardView>

Step 5: Create a new model class

Create a new class Language.kt we will use data of custom generic “Language” to pass in the list that will be shown in recycler view.

Kotlin




// this is the Language model class
class Language(
    val name : String ="",
    val exp : String = ""
)

Step 6: Working with the adapter class

Create a new class RvAdapter.kt this will act as an Adapter class for the recycler view. Comments are added before the code for better understanding.

Kotlin




import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import com.geeksforgeeks.rvadapterviewbinding.databinding.SingleItemBinding
  
class RvAdapter(
    private var languageList: List<Language>,
    private var optionsMenuClickListener: OptionsMenuClickListener
) : RecyclerView.Adapter<RvAdapter.ViewHolder>() {
  
    // create an interface for onClickListener
    // so that we can handle data most effectively in MainActivity.kt
    interface OptionsMenuClickListener {
        fun onOptionsMenuClicked(position: Int)
    }
  
    // create an inner class with name ViewHolder
    // It takes a view argument, in which pass the generated class of single_item.xml
    // ie SingleItemBinding and in the RecyclerView.ViewHolder(binding.root) pass it like this
    inner class ViewHolder(val binding: SingleItemBinding) : RecyclerView.ViewHolder(binding.root)
  
    // inside the onCreateViewHolder inflate the view of SingleItemBinding
    // and return new ViewHolder object containing this layout
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val binding = SingleItemBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return ViewHolder(binding)
    }
  
    // bind the items with each item of the list languageList which than will be
    // shown in recycler view
    // to keep it simple we are not setting any image data to view
    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        with(holder){
            with(languageList[position]){
                // set text to language name
                binding.tvLangName.text = this.name
                // set exp
                binding.tvExp.text = this.exp
                // implement on clickListener and pass position of the item
                // rest we will handle in MainActivity.kt
                binding.textViewOptions.setOnClickListener {
                    optionsMenuClickListener.onOptionsMenuClicked(position)
                }
            }
        }
    }
  
    // return the size of languageList
    override fun getItemCount(): Int {
        return languageList.size
    }
}

Step 7: Working with MainActivity.kt

Go to the MainActivity.kt file and refer to the following code. Below is the code for the MainActivity.kt file. Comments are added inside the code to understand the code in more detail.

Kotlin




import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MenuItem
import android.widget.PopupMenu
import android.widget.Toast
import androidx.core.view.get
import androidx.recyclerview.widget.LinearLayoutManager
import com.geeksforgeeks.rvadapterviewbinding.databinding.ActivityMainBinding
  
class MainActivity : AppCompatActivity() {
  
    // view binding for the activity
    private var _binding: ActivityMainBinding? = null
    private val binding get() = _binding!!
  
    // get reference to the adapter class
    private var languageList = ArrayList<Language>()
    private lateinit var rvAdapter: RvAdapter
  
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        _binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
  
        // define layout manager for the Recycler view
        binding.rvList.layoutManager = LinearLayoutManager(this)
        // attach adapter to the recycler view and also handle item click
        rvAdapter = RvAdapter(languageList , object : RvAdapter.OptionsMenuClickListener{
            // implement the required method
            override fun onOptionsMenuClicked(position: Int) {
                // this method will handle the onclick options click
                // it is defined below
                performOptionsMenuClick(position)
            }
        })
        // add adapter to the recycler view
        binding.rvList.adapter = rvAdapter
  
        // create objects of Language
        // create some row data
        val language1 = Language("Java" , "3 Year exp" )
        val language2 = Language("Kotlin" , "2 Year exp" )
        val language3 = Language("Python" , "1 Year exp" )
        val language4 = Language("CPP" , "5 Year exp" )
        val language5 = Language("PHP" , "No exp" )
  
        // pass raw data t rhe list
        languageList.add(language1)
        languageList.add(language2)
        languageList.add(language3)
        languageList.add(language4)
        languageList.add(language5)
  
        rvAdapter.notifyDataSetChanged()
    }
  
    // this method will handle the onclick options click
    private fun performOptionsMenuClick(position: Int) {
        // create object of PopupMenu and pass context and view where we want
        // to show the popup menu
        val popupMenu = PopupMenu(this , binding.rvList[position].findViewById(R.id.textViewOptions))
        // add the menu
        popupMenu.inflate(R.menu.options_menu)
        // implement on menu item click Listener
        popupMenu.setOnMenuItemClickListener(object : PopupMenu.OnMenuItemClickListener{
            override fun onMenuItemClick(item: MenuItem?): Boolean {
                when(item?.itemId){
                    R.id.delete -> {
                        // here are the logic to delete an item from the list
                        val tempLang = languageList[position]
                        languageList.remove(tempLang)
                        rvAdapter.notifyDataSetChanged()
                        return true
                    }
                    // in the same way you can implement others
                    R.id.item2 -> {
                        // define
                        Toast.makeText(this@MainActivity , "Item 2 clicked" , Toast.LENGTH_SHORT).show()
                        return true
                    }
                    R.id.item3 -> {
                        // define
                        Toast.makeText(this@MainActivity , "Item 3 clicked" , Toast.LENGTH_SHORT).show()
                        return true
                    }
                }
                return false
            }
        })
        popupMenu.show()
    }
  
    // on destroy of view make the binding reference to null
    override fun onDestroy() {
        super.onDestroy()
        _binding = null
    }
}

Output:

Github repo here. 

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