Query Api Fetch using Adapter (Kotlin + Multiple Data Classes )

activity_main.xml

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

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".view.Activity.TestActivity">

        <TextView
            android:id="@+id/news"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="News"
            android:textSize="20dp"
            android:textStyle="bold"
            android:layout_marginStart="15dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_marginTop="10dp"
            app:layout_constraintTop_toBottomOf="@+id/news"
            app:layout_constraintBottom_toBottomOf="parent"
            />

    </androidx.constraintlayout.widget.ConstraintLayout>

</layout>

ApiClient.kt

package com.example.exam3.application.network

import okhttp3.OkHttpClient
import okhttp3.logging.HttpLoggingInterceptor
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory

object ApiClient {

    val BASE_URL : String = " https://newsapi.org/"
    var retrofit: Retrofit? = null

    fun getApiData(): Retrofit? {
        if (retrofit == null) {

            val interceptor = HttpLoggingInterceptor()
            interceptor.level = HttpLoggingInterceptor.Level.BODY
            val builder = OkHttpClient.Builder()
                .addInterceptor(interceptor)


            retrofit = Retrofit.Builder()
                .baseUrl(BASE_URL)
                .client(builder.build())
                .addConverterFactory(GsonConverterFactory.create())
                .build()
        }
        return retrofit
    }
}

ApiInterface.kt

package com.example.exam3.application.network

import com.example.exam3.model.datamodel.Article
import com.example.exam3.model.datamodel.PojoItems
import retrofit2.Call
import retrofit2.http.GET
import retrofit2.http.Query

interface ApiInterface {

    //pass the query in the method

    @GET("v2/everything")
    fun getData(@Query ("q") a:String,
                @Query ("from") date: Int,
        @Query ("sortBy") sort:String,
    @Query ("apiKey") key:String


    ) : Call<PojoItems>
}

Article.kt

package com.example.exam3.model.datamodel

import android.os.Parcelable
import kotlinx.android.parcel.Parcelize

@Parcelize
data class Article(
    val author: String,
    val content: String,
    val description: String,
    val publishedAt: String,
    val title: String,
    val url: String,
    val urlToImage: String
): Parcelable

build.gradle

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'

    id 'kotlin-kapt'
    id 'kotlin-android-extensions'

}

android {
    compileSdk 32

    defaultConfig {
        applicationId "com.example.exam3"
        minSdk 21
        targetSdk 32
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled 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'
    }
    buildFeatures {
        dataBinding true

    }
}
    dependencies {
        implementation 'androidx.core:core-ktx:1.7.0'
        implementation 'androidx.appcompat:appcompat:1.4.2'
        implementation 'com.google.android.material:material:1.6.1'
        implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
        testImplementation 'junit:junit:4.13.2'
        androidTestImplementation 'androidx.test.ext:junit:1.1.3'
        androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

        implementation("androidx.recyclerview:recyclerview:1.2.1")
        implementation("androidx.cardview:cardview:1.0.0")

        implementation 'com.google.code.gson:gson:2.8.7'
        implementation 'com.squareup.retrofit2:retrofit:2.9.0'
        implementation 'com.squareup.retrofit2:converter-gson:2.9.0'

        implementation("com.squareup.okhttp3:logging-interceptor:4.10.0")

        implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
        implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0"
        implementation "android.arch.lifecycle:viewmodel:1.1.0"
        implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
        implementation 'androidx.appcompat:appcompat:1.4.2'
        implementation 'com.github.bumptech.glide:glide:4.13.2'
        kapt 'com.github.bumptech.glide:compiler:4.13.2'


    }

item.xml

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

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

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#FFFFFF"
        >


        <androidx.cardview.widget.CardView
            android:layout_width="match_parent"
            android:layout_height="250dp"
            android:layout_margin="10dp"
            app:cardElevation="5dp"
            android:background="#FFFFFF"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            >

            <androidx.constraintlayout.widget.ConstraintLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="#FFFFFF"

                >

                <ImageView
                    android:id="@+id/item_image"
                    android:layout_width="match_parent"
                    android:layout_height="120dp"
                    android:scaleType="fitXY"
                    android:layout_marginTop="5dp"
                    android:layout_marginHorizontal="10dp"
                    app:layout_constraintTop_toTopOf="parent"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintEnd_toEndOf="parent"

                    />


                <androidx.appcompat.widget.AppCompatTextView
                    android:id="@+id/item_date"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Date"
                    android:layout_marginTop="10dp"
                    android:textColor="#181819"
                    android:textSize="12dp"
                    app:layout_constraintTop_toBottomOf="@+id/item_image"
                    app:layout_constraintStart_toStartOf="@id/item_image"
                    app:layout_constraintBottom_toTopOf="@+id/item_description"
                />

                <androidx.appcompat.widget.AppCompatTextView
                    android:id="@+id/item_description"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:text="Description"
                    android:textSize="15dp"
                    android:textColor="#000"
                    app:layout_constraintStart_toStartOf="@id/item_date"
                    app:layout_constraintTop_toBottomOf="@id/item_date"
                    app:layout_constraintBottom_toBottomOf="parent"
                    app:layout_constraintEnd_toEndOf="@id/item_image"

                    />

            </androidx.constraintlayout.widget.ConstraintLayout>
        </androidx.cardview.widget.CardView>



    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

MainActivity.kt

package com.example.exam3.view.activity

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity

import android.util.Log
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProvider
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.exam3.R
import com.example.exam3.view.adapter.TestAdapter
import com.example.exam3.view.viewmodel.TestViewModel
import com.example.exam3.view.viewmodel.TestViewModelFactory
import com.example.exam3.application.network.ApiClient
import com.example.exam3.application.network.ApiInterface
import com.example.exam3.databinding.ActivityMainBinding
import com.example.exam3.model.datamodel.Article
import com.example.exam3.model.datamodel.PojoItems
import com.example.exam3.repository.PostRepository

//class MainActivity : AppCompatActivity() {
//    override fun onCreate(savedInstanceState: Bundle?) {
//        super.onCreate(savedInstanceState)
//        setContentView(R.layout.activity_main)
//    }
//}

class MainActivity : AppCompatActivity() {
    lateinit var binding: ActivityMainBinding
    lateinit var viewModel: TestViewModel

    var list: List<Article> = ArrayList()

    val adapter = TestAdapter(list)

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


        val apiInterface = ApiClient.getApiData()?.create(ApiInterface::class.java)

        val repository  = PostRepository(apiInterface!!)

        viewModel = ViewModelProvider(this, TestViewModelFactory(repository)).get(TestViewModel::class.java)

        binding.recyclerView.adapter = adapter
        binding.recyclerView.layoutManager = LinearLayoutManager(this)



        viewModel.postList.observe(this, Observer {
            Log.d("TAG", "List: $it")
            adapter.setData(it)
        })



        viewModel.getAllData()



    }
}

PojoItems.kt

package com.example.exam3.model.datamodel

import com.google.gson.annotations.SerializedName


data class PojoItems(

    @SerializedName("articles")
    val articles: List<Article>,
    val status: String,
    val totalResults: Int
)

PostRepository.kt

package com.example.exam3.repository

import com.example.exam3.application.network.ApiInterface

class PostRepository( private val apiInterface: ApiInterface) {

    //set the method query
    fun getPost() = apiInterface.getData("tesla", 2022 - 6 - 26,"publishedAt","e323a6f898124786b6cf743a4987d0a8")
}

Source.kt

package com.example.exam3.model.datamodel

data class Source(
    val id: String,
    val name: String
)

TestAdapter.kt

package com.example.exam3.view.adapter

import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.databinding.DataBindingUtil
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.example.exam3.R
import com.example.exam3.databinding.ItemBinding
import com.example.exam3.model.datamodel.Article

class TestAdapter (var list: List<Article>): RecyclerView.Adapter<TestAdapter.ViewHolder>() {

    var dataBinding: ItemBinding ? = null



    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        dataBinding = DataBindingUtil.inflate(LayoutInflater.from(parent.context),
            R.layout.item,parent ,false)
        return ViewHolder(dataBinding!!)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val item: Article = list[position]
        holder.bindData(item)
    }

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

    fun  setData(data: List<Article>){
        this.list = data
        notifyDataSetChanged()
    }


    class ViewHolder (var binding: ItemBinding) : RecyclerView.ViewHolder(binding.root){
        fun bindData(article: Article) {

            Glide.with(itemView.context)
                .load(article.urlToImage)
                .into(binding.itemImage)

            binding.itemDate.text = article.publishedAt
            binding.itemDescription.text = article.description


//            binding.postTitle.text = pojoItem.title
//            binding.post.text = pojoItem.body
//            binding.postId.text = pojoItem.id

        }
    }
}

TestViewModel.kt

package com.example.exam3.view.viewmodel

import android.util.Log
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import com.example.exam3.model.datamodel.Article
import com.example.exam3.model.datamodel.PojoItems
import com.example.exam3.repository.PostRepository
import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response

class TestViewModel(val repository: PostRepository): ViewModel() {

    val postList = MutableLiveData<List<Article>>()


    fun getAllData(){
        val response = repository.getPost()
        response.enqueue(object : Callback<PojoItems> {
            override fun onResponse(call: Call<PojoItems>,
                                    response: Response<PojoItems>,){

                val data = response.body() as PojoItems
                postList.value= (data.articles)

            }
            override fun onFailure(call: Call<PojoItems>, t: Throwable) {
                Log.e("Fail", "${t.message}")
            }
        })
    }

}

TestViewModelFactory.kt

package com.example.exam3.view.viewmodel

import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import com.example.exam3.repository.PostRepository

class TestViewModelFactory(private val repository: PostRepository): ViewModelProvider.Factory {
    override fun <T : ViewModel?> create(modelClass: Class<T>): T {
        return TestViewModel(repository) as T
    }
}

Params of API through Postman -

key value
q tesla
from 2022-06-26
sortBy publishedAt
apiKey e323a6f898124786b6cf743a4987d0a8