RecyclerView itemClickListener in Kotlin [closed]

Answer 1

My simple solution using higher-order function and let scoping function to set listener only if itemAction has been set

// Adapter
private var itemAction: ((Item) -> Unit)? = null

fun setItemAction(action: (Item) -> Unit) {
    this.itemAction = action
}

inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
    fun setItem(item: Item) {

        // ...

        itemAction?.let {
            itemView.setOnClickListener { it(item) }
        }
    }
}

and in activity/fragment

adapter.setItemAction { // <- it is Item
  // do something with it
}

Answer 2

Two ways you can have an access to recyclerview in kotlin is first you can directly declare OnClickListener in adapter and make redirection inside it and second way is you can redirect your onclick to fragment/activity where you have set adapter of recycler

1.

 class CartAdapter(context: Context) : RecyclerView.Adapter<CartAdapter.ViewHolder>() {
        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
            return ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.layout_cart, parent, false));
        }

        override fun getItemCount(): Int {
            return 10;
        }

        override fun onBindViewHolder(holder: ViewHolder, position: Int) {
           holder.itemView.rtbProductRating.setOnClickListener{

            var iNavigation= Intent(context,MainActivity::class.java)
            iNavigation.flags= Intent.FLAG_ACTIVITY_LAUNCH_ADJACENT
            context.startActivity(iNavigation)

// directly redirect your activity from adapter
           }

        }

        class ViewHolder(itemView: View?) : RecyclerView.ViewHolder(itemView)
    } 

Second way you can have is redirect your adapter click to fragment/activity and then redirect your activity from there instead of redirecting from adapter

 class CartAdapter(context: Context, onClickListener: View.OnClickListener) : RecyclerView.Adapter<CartAdapter.ViewHolder>() {
        var context = context
        var onClickListener = onClickListener
        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
            return ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.layout_cart, parent, false));
        }

        override fun getItemCount(): Int {
            return 10;
        }

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

//set your position to the view
            holder.itemView.rtbProductRating.tag = position

//redirect click to the fragment
            holder.itemView.rtbProductRating.setOnClickListener {
                onClickListener.onClick(holder.itemView.rtbProductRating)

            }
    //        holder.itemView.tv_waybill_count.text = holder.itemView.context.getString(R.string.waybills,5)
        }

        class ViewHolder(itemView: View?) : RecyclerView.ViewHolder(itemView)
    }


Your fragment will look like:

class CartFragment: BaseFragment(),View.OnClickListener {
    override val layout= R.layout.frg_cart

     override fun onClick(v: View?) {
      var position=v?.tag as Int

        if(position==0){
            var iNavigation= Intent(this,MainActivity::class.java)
            iNavigation.flag=Intent.FLAG_ACTIVITY_LAUNCH_ADJACENT
            startActivity(iNavigation)
        }
    }

  override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        listener()
    }

    private fun listener() {
        cart_rv.adapter=CartAdapter(activity,this)
    }
}

Answer 3

Finally, here is a nice working solution:

MyRecyclerAdapter.kt

class MyRecyclerAdapter(val context: Context, val items : ArrayList<Item>, val clickListener: (Int) -> Unit) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, p1: Int): RecyclerView.ViewHolder {
        return MyViewHolder(LayoutInflater.from(context).inflate(R.layout.my_item, parent, false))
    }

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

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        (holder as MyViewHolder).clickableView.setOnClickListener {
            clickListener(position)
        }
    }
}

class MyViewHolder (view: View) : RecyclerView.ViewHolder(view) {
    val clickableView = view.clickable_view
}

MainActivity.kt

fun appClickListener(position: Int) {
    // You got the position of ArrayList
}

my_recyclerview.adapter = MyRecyclerAdapter(this, myList, clickListener = {
    appClickListener(it)
})

Answer 4

If someone interested in the old way implementation..

I posted full example which also reduces your adapter code as well. It uses the old pattern of getting callback..

Project level gradle

buildscript {
    ext.kotlin_version = '1.3.10'
    repositories {
        google()
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"//newly added

        classpath 'com.google.gms:google-services:4.1.0' // google-services plugin

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

App level Gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'org.jetbrains.kotlin.android.extensions'//it is used for @Percelize

android {
    compileSdkVersion 28
    dataBinding {
        enabled = true
    }
    androidExtensions {
        experimental = true
    }
    defaultConfig {
        applicationId 'broadpeak.firebase.learning'
        minSdkVersion 19
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

/*kapt {
    generateStubs = true
}*/
dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.firebase:firebase-core:16.0.5'
    implementation 'com.google.firebase:firebase-firestore:17.1.3'
    implementation 'com.google.firebase:firebase-auth:16.0.5'
    implementation 'com.google.firebase:firebase-messaging:17.3.4'
    implementation 'com.google.code.gson:gson:2.8.5'

    implementation 'com.firebaseui:firebase-ui-auth:4.1.0'

    implementation 'com.github.bumptech.glide:glide:4.8.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'
    ////kapt "com.android.databinding:compiler:$android_plugin_version"\ // not required above 3.2.0
    ///kapt "com.android.databinding:compiler:3.1.4"
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

// ADD THIS AT THE BOTTOM
apply plugin: 'com.google.gms.google-services'

SubjectListActivity.class

class SubjectListActivity : BaseActivity() {

    var subjects = mutableListOf<SubjectBO>()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.question_list_activity)

        recycler_view.itemAnimator = DefaultItemAnimator()
        recycler_view.setHasFixedSize(true)
        recycler_view.layoutManager = LinearLayoutManager(this@SubjectListActivity)

        db.collection("tagCollection").get().addOnSuccessListener { querySnapshot ->
            if (querySnapshot.isEmpty()) {
                Log.d(TAG, "onSuccess: LIST EMPTY")
            } else {
                // Convert the whole Query Snapshot to a list
                // of objects directly! No need to fetch each document.
                subjects = querySnapshot.toObjects(SubjectBO::class.java)

                if(subjects.size > 0){
                    recycler_view.adapter = SubjectAdapter(subjects, object : OnRecyclerItemClickListener {
                        override fun onItemClicked(view: View?, position: Int) {
                            var intent = Intent(this@SubjectListActivity,McqActivity::class.java)
                            intent.putExtra("keyTagBO",subjects.get(position))
                            startActivity(intent)
                        }
                    });
                }

            }
        }.addOnFailureListener { exception ->
            exception.printStackTrace()
        }
    }

SubjectAdapter.class

class SubjectAdapter(items: List<SubjectBO>, onRecyclerItemClickListener: OnRecyclerItemClickListener)
    : BaseAdapter<SubjectBO, SubjectViewHolder>(items, onRecyclerItemClickListener) {

    override fun onCreateViewHolder(parent: ViewGroup, p1: Int): SubjectViewHolder {
        return SubjectViewHolder(parent, R.layout.item_subject, onRecyclerItemClickListener)
    }
}

SubjectViewHolder.class

class SubjectViewHolder(parent: ViewGroup, itemLayoutId: Int, onRecyclerItemClickListener:
    OnRecyclerItemClickListener) : BaseViewHolder<SubjectBO>(parent, itemLayoutId, onRecyclerItemClickListener) {

    override fun bindData(data: SubjectBO) {
        itemView.tvTitle.setText(data.tagName)
    }
}

BaseAdapter.class

abstract class BaseAdapter<T, U : BaseViewHolder<T>>
(var items: List<T>, var onRecyclerItemClickListener: OnRecyclerItemClickListener)
    : RecyclerView.Adapter<U>() {

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

    override fun onBindViewHolder(holder: U, pos: Int) {
        holder.bindData(items.get(pos))
    }
}

BaseViewHolder.class

abstract class BaseViewHolder<T : BaseModel>(parent: ViewGroup, @LayoutRes itemLayoutId: Int,
                                             var onRecyclerItemClickListener: OnRecyclerItemClickListener) :
        RecyclerView.ViewHolder(LayoutInflater.from(parent.context).inflate(itemLayoutId, parent,
                false)), View.OnClickListener {

    override fun onClick(v: View?) {
        onRecyclerItemClickListener.onItemClicked(v, adapterPosition)
    }

    abstract fun bindData(data: T)

    init {
        itemView.setOnClickListener(this)
    }
}

OnRecyclerItemClickListener.class

interface OnRecyclerItemClickListener{
    fun onItemClicked(view: View?, position: Int)
}

Answer 5

Adapter constructor declaration

class YourAdapter(private val mListener: (ItemObject) -> Unit) : RecyclerView.Adapter<ViewHolder>()

Adapter::onBindViewHolder

holder.itemView.setOnClickListener {
    mListener.invoke(item) // <- item instance of ItemObject
}

How to Use

mTypesWasteAdapter = YourAdapter({ it.something()})

Basically, you will receive the ItemObject as it in the lambda argument.

Answer 6

Kotlin

Make your adapter constructor like this

    class ViewAdapter(
        private val context: Context,
        private val mListener: (DataClass) -> Unit
    ) :
        RecyclerView.Adapter<WeekRecyclerViewAdapter.ViewHolder>() {

// Your adapter code goes here

}

In your onBindViewHolder,

holder.binding.parentLayout.setOnClickListener {
                mListener.invoke(items[position]) // <- item instance of ItemObject
        }

In your Fragment, implement like below

class YourFragment : Fragment(), (DataClass) -> Unit {
    override fun invoke(p1: DataClass) {

        //You will get the selected item here

    }