Recyclerview Using Retrofit

Api:

http://reqres.in/api/users?page=2
{
    "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"
        },
        {
            "id": 8,
            "email": "lindsay.ferguson@reqres.in",
            "first_name": "Lindsay",
            "last_name": "Ferguson",
            "avatar": "https://reqres.in/img/faces/8-image.jpg"
        },
        {
            "id": 9,
            "email": "tobias.funke@reqres.in",
            "first_name": "Tobias",
            "last_name": "Funke",
            "avatar": "https://reqres.in/img/faces/9-image.jpg"
        },
        {
            "id": 10,
            "email": "byron.fields@reqres.in",
            "first_name": "Byron",
            "last_name": "Fields",
            "avatar": "https://reqres.in/img/faces/10-image.jpg"
        },
        {
            "id": 11,
            "email": "george.edwards@reqres.in",
            "first_name": "George",
            "last_name": "Edwards",
            "avatar": "https://reqres.in/img/faces/11-image.jpg"
        },
        {
            "id": 12,
            "email": "rachel.howell@reqres.in",
            "first_name": "Rachel",
            "last_name": "Howell",
            "avatar": "https://reqres.in/img/faces/12-image.jpg"
        }
    ],
    "support": {
        "url": "https://reqres.in/#support-heading",
        "text": "To keep ReqRes free, contributions towards server costs are appreciated!"
    }
}

For the above API we will see the program below

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"
    tools:context=".MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"

        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="No data"
            android:id="@+id/tv"
            android:visibility="gone"
            />

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

    </LinearLayout>
</layout>

MainActivity.Java

package com.androidian.retro;



import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;


import com.androidian.retro.databinding.ActivityMainBinding;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class MainActivity extends AppCompatActivity {

    ActivityMainBinding binding;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding= DataBindingUtil.setContentView
                (MainActivity.this,R.layout.activity_main);



        Retrofit retrofit=new Retrofit.Builder()
                .baseUrl("http://reqres.in/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        ListInterface listInterface=retrofit.create(ListInterface.class);



        Call<ListRes> listResCall=listInterface.loadData();

        listResCall.enqueue(new Callback<ListRes>() {
            @Override
            public void onResponse(Call<ListRes> call, Response<ListRes> response) {
                Log.i("data",new Gson().toJson(response.body()));
                Log.i("data", String.valueOf(response.code()));



                        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(
                                MainActivity.this, RecyclerView.VERTICAL,
                                false );
                        binding.rec.setLayoutManager(linearLayoutManager);
                        binding.rec.setAdapter(new RecapAdp(MainActivity.this,
                                response.body().getData()));


            }

            @Override
            public void onFailure(Call<ListRes> call, Throwable t) {
                Toast.makeText(MainActivity.this, ""+t.toString(), Toast.LENGTH_SHORT).show();
                Log.i("error",t.getMessage().toString());

            }
        });


    }
}

RecapAdp.Java

package com.androidian.retro;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.databinding.DataBindingUtil;
import androidx.recyclerview.widget.RecyclerView;

import com.androidian.retro.databinding.CustomBinding;

import java.util.List;

public class RecapAdp extends RecyclerView.Adapter<RecapAdp.MyViewHolder> {
    Context context;
    CustomBinding binding;
    List<Datum> adpdata;
    public RecapAdp(MainActivity mainActivity, List<Datum> data) {
        context=mainActivity;
        adpdata=data;
    }

    @NonNull
    @Override
    public RecapAdp.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater= (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        binding= DataBindingUtil.inflate(layoutInflater,
                R.layout.custom,null,false);
        return new RecapAdp.MyViewHolder(binding.getRoot());
    }

    @Override
    public void onBindViewHolder(@NonNull RecapAdp.MyViewHolder holder, int position) {

        holder.binding.id.setText(adpdata.get(position).getId().toString());
        holder.binding.jurl.setText(adpdata.get(position).getId().toString());
        //holder.binding.tile.setText(adpdata.get(position).getYear().toString());
        Log.i("datarec",adpdata.toString());

    }

    @Override
    public int getItemCount() {
        return adpdata.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        CustomBinding binding;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            binding=DataBindingUtil.getBinding(itemView);
        }
    }
}

custom.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:id="@+id/ll">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tile"

        />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/id"

        />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jurl"

        />

</LinearLayout>
</layout>

Listinterface.java

package com.androidian.retro;



import com.google.gson.JsonObject;

import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.GET;
import retrofit2.http.Headers;
import retrofit2.http.POST;

public interface ListInterface {
    @Headers("Content-Type:application/json")
    @GET("api/users?page=2")
    Call<ListRes> loadData();
}

ListRes.java

package com.androidian.retro;

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

import java.util.List;

public class ListRes {

    @SerializedName("page")
    @Expose
    private Integer page;
    @SerializedName("per_page")
    @Expose
    private Integer perPage;
    @SerializedName("total")
    @Expose
    private Integer total;
    @SerializedName("total_pages")
    @Expose
    private Integer totalPages;
    @SerializedName("data")
    @Expose
    private List<Datum> data;
    @SerializedName("support")
    @Expose
    private Support support;

    public Integer getPage() {
        return page;
    }

    public void setPage(Integer page) {
        this.page = page;
    }

    public Integer getPerPage() {
        return perPage;
    }

    public void setPerPage(Integer perPage) {
        this.perPage = perPage;
    }

    public Integer getTotal() {
        return total;
    }

    public void setTotal(Integer total) {
        this.total = total;
    }

    public Integer getTotalPages() {
        return totalPages;
    }

    public void setTotalPages(Integer totalPages) {
        this.totalPages = totalPages;
    }

    public List<Datum> getData() {
        return data;
    }

    public void setData(List<Datum> data) {
        this.data = data;
    }

    public Support getSupport() {
        return support;
    }

    public void setSupport(Support support) {
        this.support = support;
    }

}

Support.java

package com.androidian.retro;

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

public class Support {
    @SerializedName("url")
    @Expose
    private String url;
    @SerializedName("text")
    @Expose
    private String text;

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

}

Datum.java

package com.androidian.retro;

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

public class Datum {
    @SerializedName("id")
    @Expose
    private Integer id;
    @SerializedName("name")
    @Expose
    private String name;
    @SerializedName("year")
    @Expose
    private Integer year;
    @SerializedName("color")
    @Expose
    private String color;
    @SerializedName("pantone_value")
    @Expose
    private String pantoneValue;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getYear() {
        return year;
    }

    public void setYear(Integer year) {
        this.year = year;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String getPantoneValue() {
        return pantoneValue;
    }

    public void setPantoneValue(String pantoneValue) {
        this.pantoneValue = pantoneValue;
    }

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <uses-permission android:name="android.permission.INTERNET"></uses-permission>

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.Retro"
        android:usesCleartextTraffic="true"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

build.gradle

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

android {
    namespace 'com.androidian.retro'
    compileSdk 33

    defaultConfig {
        applicationId "com.androidian.retro"
        minSdk 24
        targetSdk 33
        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'
    }
    dataBinding{
        enabled=true
    }

}

dependencies {

    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.6.0'
    implementation 'com.google.android.material:material:1.8.0'
    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.retrofit2:converter-gson:2.4.0'
    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    implementation 'com.google.code.gson:gson:2.8.9'
}