RecyclerView with Kotlin by Get Method

API: https://reqres.in/api/users?page=2

Method: GET

Resposnse:

{

“page”: 2, “per_page”: 6, “total”: 12, “total_pages”: 2,

“data”: [

{ “id”: 7, “email”: “michael.lawson@reqres.in”, “first_name”: “Michael”, “last_name”: “Lawson”,

“avatar”: “https://reqres.in/img/faces/7-image.jpg” },],

“support”: { “url”: “https://reqres.in/#support-heading”, “text”: “To keep ReqRes free, contributions towards server costs are appreciated!” } }

activity_home_page

<?xml version="1.0" encoding="utf-8"?>
<layout>
<LinearLayout 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=".HomePage"
    android:orientation="vertical">

   

    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/rec"/>

</LinearLayout>
</layout>

HomePage.kt

package com.androindian.sampleproject

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.databinding.DataBindingUtil
import androidx.recyclerview.widget.LinearLayoutManager
import com.androindian.sampleproject.databinding.ActivityHomePageBinding
import retrofit2.Call
import retrofit2.Response
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory

class HomePage : AppCompatActivity() {

    var binding:ActivityHomePageBinding?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding=DataBindingUtil.setContentView(this,R.layout.activity_home_page)

  

        var retrofit = Retrofit.Builder().baseUrl("https://reqres.in/api/")
            .addConverterFactory(GsonConverterFactory.create()).build()

        var retroInterface=retrofit.create(SampleProjectInteface::class.java)
        var listcall: Call<ListRes>
        listcall=retroInterface.loadData()

        listcall.enqueue(object : retrofit2.Callback<ListRes?> {
            override fun onResponse(call: Call<ListRes?>, response: Response<ListRes?>) {

                var linearLayoutManager= LinearLayoutManager(this@HomePage,
                    LinearLayoutManager.VERTICAL, false)
                binding?.rec?.layoutManager=linearLayoutManager
                var customAdapter =CustomAdapter(this@HomePage,
                    response.body()?.data as List<ListInsideData>)
                binding?.rec?.adapter = customAdapter

            }

            override fun onFailure(call: Call<ListRes?>, t: Throwable) {
                TODO("Not yet implemented")
            }
        })


    }
}

SampleProjectInteface.kt

package com.androindian.sampleproject

import okhttp3.RequestBody
import retrofit2.http.GET
import retrofit2.http.Headers
import retrofit2.http.Multipart
import retrofit2.http.POST
import retrofit2.http.Part
import retrofit2.http.Url

public interface SampleProjectInteface {

    

    @Headers("Content-Type:application/json")
    @GET("users?page=2")
    fun loadData(): retrofit2.Call<ListRes>
}

CustomAdapter.kt

package com.androindian.sampleproject

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.recyclerview.widget.RecyclerView
import com.squareup.picasso.Picasso

class CustomAdapter(homePage: HomePage, data: List<ListInsideData>) : RecyclerView.Adapter<CustomAdapter.MyViewHolder>() {

    var context: Context
    var adpData:List<ListInsideData>
    init {
        context=homePage
        adpData= data as List<ListInsideData>
    }


    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CustomAdapter.MyViewHolder {
        var view=LayoutInflater.from(parent.context).inflate(R.layout.custom,parent,false)
        return MyViewHolder(view)
    }

    override fun onBindViewHolder(holder: CustomAdapter.MyViewHolder, position: Int) {
        holder.id?.text= adpData.get(holder.adapterPosition).id.toString()
        holder.mail?.text= adpData.get(holder.adapterPosition).email
        holder.fname?.text= adpData.get(holder.adapterPosition).firstName
        holder.lname?.text= adpData.get(holder.adapterPosition).lastName
       
         Picasso.get()
            .load(adpres[holder.adapterPosition].avatar)
            .placeholder(R.drawable.ic_launcher_background)   // optional - while loading
            .error(R.drawable.ic_launcher_foreground)               // optional - if failed
            .fit()                                 // auto resize to ImageView
            .centerCrop()
            .into(holder.eimage)

        holder.iv?.setOnClickListener {
            Toast.makeText(context,""+holder.adapterPosition,Toast.LENGTH_LONG).show()
        }
    }

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

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

        var id: TextView?=null
        var mail: TextView?=null
        var fname: TextView?=null
        var lname: TextView?=null
        var iv: ImageView?=null

        init {
            id=itemView.findViewById(R.id.id1)
            mail=itemView.findViewById(R.id.email)
            fname=itemView.findViewById(R.id.firtsname)
            lname=itemView.findViewById(R.id.lastname)
            iv=itemView.findViewById(R.id.iv)
        }

    }

}

custom.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_margin="5dp"
    android:background="@drawable/border">
    <ImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:id="@+id/iv"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_margin="5dp">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/id1"
        android:textColor="#FF5722"
        android:textSize="20sp"
        android:textAllCaps="true"
        android:textStyle="italic"
        android:layout_margin="10dp"
        android:padding="5dp"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/email"
        android:textColor="#098"
        android:textSize="12sp"
        android:textAllCaps="true"
        android:textStyle="italic"
        android:layout_margin="5dp"
        android:padding="5dp"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/firtsname"
        android:textColor="#3F51B5"
        android:textSize="12sp"
        android:textAllCaps="true"
        android:textStyle="italic"
        android:layout_margin="5dp"
        android:padding="5dp"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/lastname"
        android:textColor="#E91E63"
        android:textSize="12sp"
        android:textAllCaps="true"
        android:textStyle="italic"
        android:layout_margin="5dp"
        android:padding="5dp"/>
    </LinearLayout>
</LinearLayout>

ListRes.kt

package com.androindian.sampleproject

import com.google.gson.annotations.Expose
import com.google.gson.annotations.SerializedName

class ListRes {
    @SerializedName("page")
    @Expose
    var page: Int? = null

    @SerializedName("per_page")
    @Expose
    var perPage: Int? = null

    @SerializedName("total")
    @Expose
    var total: Int? = null

    @SerializedName("total_pages")
    @Expose
    var totalPages: Int? = null

    @SerializedName("data")
    @Expose
    var data: List<ListInsideData>? = null

    @SerializedName("support")
    @Expose
    var support: Support? = null
}

Support.kt

package com.androindian.sampleproject

import com.google.gson.annotations.Expose
import com.google.gson.annotations.SerializedName

class Support {
    @SerializedName("url")
    @Expose
    var url: String? = null

    @SerializedName("text")
    @Expose
    var text: String? = null
}

ListInsideData.kt

package com.androindian.sampleproject

import com.google.gson.annotations.Expose
import com.google.gson.annotations.SerializedName

class ListInsideData {
    @SerializedName("id")
    @Expose
    var id: Int? = null

    @SerializedName("email")
    @Expose
    var email: String? = null

    @SerializedName("first_name")
    @Expose
    var firstName: String? = null

    @SerializedName("last_name")
    @Expose
    var lastName: String? = null

    @SerializedName("avatar")
    @Expose
    var avatar: String? = null
}

build.gradle

plugins {
    id("com.android.application")
    id("org.jetbrains.kotlin.android")
}

android {
    namespace = "com.androindian.sampleproject"
    compileSdk = 34

    defaultConfig {
        applicationId = "com.androindian.sampleproject"
        minSdk = 24
        targetSdk = 33
        versionCode = 1
        versionName = "1.0"

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = "1.8"
    }
    dataBinding{
        enable=true
    }
}

dependencies {

    implementation("androidx.core:core-ktx:1.9.0")
    implementation ("com.squareup.retrofit2:retrofit:2.4.0")
    implementation ("com.google.code.gson:gson:2.8.9")
    implementation ("com.squareup.retrofit2:converter-gson:2.4.0")
    implementation("androidx.appcompat:appcompat:1.6.1")
    implementation("com.google.android.material:material:1.10.0")
    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
    testImplementation("junit:junit:4.13.2")
    androidTestImplementation("androidx.test.ext:junit:1.1.5")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
     implementation ("com.squareup.picasso:picasso:2.71828")

        // Optional: OkHttp3 downloader for improved caching control
        implementation ("com.jakewharton.picasso:picasso2-okhttp3-downloader:1.1.0")


}