kotlin recyclerview in android example

 kotlin recyclerview in android example

In this Article today lern kotlin recyclerview in android. follow the full source code kotlin recyclerview in android

1.build.gradle:

 implementation 'androidx.recyclerview:recyclerview:1.1.0'

2.MainActivity.kt:

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.support.v7.widget.GridLayoutManager

import android.support.v7.widget.LinearLayoutManager

import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    // Initializing an empty ArrayList to be filled with animals

    val animals: ArrayList<String> = ArrayList()

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        // Loads animals into the ArrayList

        addAnimals()

        // Creates a vertical Layout Manager

        rv_animal_list.layoutManager = LinearLayoutManager(this)

        // You can use GridLayoutManager if you want multiple columns. Enter the number of columns as a parameter.

//        rv_animal_list.layoutManager = GridLayoutManager(this, 2)

        // Access the RecyclerView Adapter and load the data into it

        rv_animal_list.adapter = AnimalAdapter(animals, this)

    }

    // Adds animals to the empty animals ArrayList

    fun addAnimals() {

        animals.add("dog")

        animals.add("cat")

        animals.add("owl")

        animals.add("cheetah")

        animals.add("raccoon")

        animals.add("bird")

        animals.add("snake")

        animals.add("lizard")

        animals.add("hamster")

        animals.add("bear")

        animals.add("lion")

        animals.add("tiger")

        animals.add("horse")

        animals.add("frog")

        animals.add("fish")

        animals.add("shark")

        animals.add("turtle")

        animals.add("elephant")

        animals.add("cow")

        animals.add("beaver")

        animals.add("bison")

        animals.add("porcupine")

        animals.add("rat")

        animals.add("mouse")

        animals.add("goose")

        animals.add("deer")

        animals.add("fox")

        animals.add("moose")

        animals.add("buffalo")

        animals.add("monkey")

        animals.add("penguin")

        animals.add("parrot")

    }

}

3.AnimalAdapter.kt:

import android.content.Context

import android.support.v7.widget.RecyclerView

import android.view.LayoutInflater

import android.view.View

import android.view.ViewGroup

import kotlinx.android.synthetic.main.animal_list_item.view.*

class AnimalAdapter(val items : ArrayList<String>, val context: Context) : RecyclerView.Adapter<ViewHolder>() {

    // Gets the number of animals in the list

    override fun getItemCount(): Int {

        return items.size

    }

    // Inflates the item views

    override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): ViewHolder {

        return ViewHolder(LayoutInflater.from(context).inflate(R.layout.animal_list_item, parent, false))

    }

    // Binds each animal in the ArrayList to a view

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

        holder?.tvAnimalType?.text = items.get(position)

    }

}

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

        // Holds the TextView that will add each animal to

        val tvAnimalType = view.tv_animal_type

}

4.activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example.recylerview.tutorial.MainActivity">

    <androidx.support.v7.widget.RecyclerView

        android:id="@+id/rv_animal_list"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

</androidx.support.constraint.ConstraintLayout>

5.animal_list_item.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="match_parent"

    android:layout_height="wrap_content">

    <TextView

        android:id="@+id/tv_animal_type"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:textSize="20sp"

        android:padding="20dp"/>

</LinearLayout>

6.AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.recylerview.tutorial">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>