// app/build.gradle
implementation 'com.google.android.material:material:1.3.0'
                                        
                                        
<!-- activity_main.xml -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<Button
    android:id="@+id/show_data"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Show Data"
    android:textSize="18sp"
    android:textColor="@color/colorWhite"
    android:background="@color/colorPrimaryDark"
    android:layout_margin="6dp"
    android:textAllCaps="false"/>

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@id/show_data"/>
</RelativeLayout>



<!-- custom_recycler_json.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:padding="6dp">

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:cardCornerRadius="10dp"
        app:contentPadding="6dp"
        android:layout_margin="4dp"
        android:scrollbars="vertical"
        android:focusable="true">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="8dp"
            android:orientation="vertical"
            android:gravity="center">

            <TextView
                android:id="@+id/name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Name"
                android:textSize="18sp"
                android:textStyle="bold"
                android:padding="3dp"
                android:textColor="@color/colorPrimaryDark"/>

            <TextView
                android:id="@+id/age"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Age"
                android:textSize="16sp"
                android:padding="3dp"
                android:textColor="@color/colorBlack"/>

            <TextView
                android:id="@+id/city"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="City"
                android:textSize="18sp"
                android:padding="3dp"
                android:textColor="@color/colorOrange"/>

        </LinearLayout>

    </androidx.cardview.widget.CardView>
</LinearLayout>


                                    
                                  

                                    
                                        // MainActivity.java

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    Button button;
    ArrayList<Pojo> empList;
    RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = findViewById(R.id.show_data);
        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setHasFixedSize(true);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);

        empList = new ArrayList<>();

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (empList != null) {
                    empList.clear();
                    parseEmpData();
                } else {
                    parseEmpData();
                }
            }
        });
    }

    private void parseEmpData() {
        try {
            String loadJsonData = loadJSONFromRaw();
            JSONObject rootJSONObject = new JSONObject(loadJsonData);
            JSONArray empJSONArray = rootJSONObject.getJSONArray("employees");

            for (int i = 0; i < empJSONArray.length(); i++) {
                JSONObject employee = empJSONArray.getJSONObject(i);
                String name = employee.getString("name");
                String age = employee.getString("age");
                String city = employee.getString("city");

                Pojo pojo = new Pojo();
                pojo.setName(name);
                pojo.setAge(age);
                pojo.setCity(city);

                empList.add(pojo);
                AdapterRecycler adapterRecycler = new AdapterRecycler(this, empList);
                recyclerView.setAdapter(adapterRecycler);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public String loadJSONFromRaw() throws IOException {
        InputStream inputStream = null;
        StringBuilder stringBuilder = new StringBuilder();
        try {
            String jsonDataString = null;
            inputStream = getResources().openRawResource(R.raw.data);
            BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(inputStream, "UTF-8")
            );
            while ((jsonDataString = bufferedReader.readLine()) != null) {
                stringBuilder.append(jsonDataString);
            }
        } finally {
            if (inputStream != null) {
                inputStream.close();
            }
        }
        return new String(stringBuilder);
    }
}



// AdapterRecycler.java

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;

public class AdapterRecycler extends RecyclerView.Adapter<AdapterRecycler.MyHolder> {

    Context context;
    ArrayList<Pojo> empPojos;

    public AdapterRecycler(Context context, ArrayList<Pojo> empPojos) {
        this.context = context;
        this.empPojos = empPojos;
    }

    @NonNull
    @Override
    public AdapterRecycler.MyHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.custom_recycler_json, parent, false);
        MyHolder myHolder = new MyHolder(view);
        return myHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull AdapterRecycler.MyHolder holder, final int position) {
        holder.name.setText(empPojos.get(position).getName());
        holder.age.setText(empPojos.get(position).getAge());
        holder.city.setText(empPojos.get(position).getCity());
    }

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

    public static class MyHolder extends RecyclerView.ViewHolder {
        TextView name, age, city;

        public MyHolder(@NonNull View view) {
            super(view);
            name = view.findViewById(R.id.name);
            age = view.findViewById(R.id.age);
            city = view.findViewById(R.id.city);
        }
    }
}



// Pojo.java

public class Pojo {

    private String name;
    private String age;
    private String city;

    public Pojo() {
    }

    public String getName() {
        return name;
    }

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

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }
}


                                      
                                    
                                  

                                      
                                        // MainActivity.kt

import android.os.Bundle
import android.view.View
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import org.json.JSONArray
import org.json.JSONObject
import java.io.BufferedReader
import java.io.IOException
import java.io.InputStream
import java.io.InputStreamReader

class MainActivity : AppCompatActivity() {

    private lateinit var button: Button
    private lateinit var empList: ArrayList<Pojo>
    private lateinit var recyclerView: RecyclerView

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

        button = findViewById(R.id.show_data)
        recyclerView = findViewById(R.id.recyclerView)
        recyclerView.setHasFixedSize(true)
        val linearLayoutManager = LinearLayoutManager(this)
        recyclerView.layoutManager = linearLayoutManager

        empList = ArrayList()

        button.setOnClickListener {
            if (empList.isNotEmpty()) {
                empList.clear()
                parseEmpData()
            } else {
                parseEmpData()
            }
        }
    }

    private fun parseEmpData() {
        try {
            val loadJsonData = loadJSONFromRaw()
            val rootJSONObject = JSONObject(loadJsonData)
            val empJSONArray = rootJSONObject.getJSONArray("employees")

            for (i in 0 until empJSONArray.length()) {
                val employee = empJSONArray.getJSONObject(i)
                val name = employee.getString("name")
                val age = employee.getString("age")
                val city = employee.getString("city")

                val pojo = Pojo()
                pojo.name = name
                pojo.age = age
                pojo.city = city

                empList.add(pojo)
                val adapterRecycler = AdapterRecycler(this, empList)
                recyclerView.adapter = adapterRecycler
            }
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }

    @Throws(IOException::class)
    private fun loadJSONFromRaw(): String {
        var inputStream: InputStream? = null
        val stringBuilder = StringBuilder()
        try {
            var jsonDataString: String?
            inputStream = resources.openRawResource(R.raw.data)
            val bufferedReader = BufferedReader(
                InputStreamReader(inputStream, "UTF-8")
            )
            while (bufferedReader.readLine().also { jsonDataString = it } != null) {
                stringBuilder.append(jsonDataString)
            }
        } finally {
            inputStream?.close()
        }
        return stringBuilder.toString()
    }
}


// AdapterRecycler.kt

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class AdapterRecycler(private val context: Context, private val empPojos: ArrayList<Pojo>) :
    RecyclerView.Adapter<AdapterRecycler.MyHolder>() {

    class MyHolder(view: View) : RecyclerView.ViewHolder(view) {
        val name: TextView = view.findViewById(R.id.name)
        val age: TextView = view.findViewById(R.id.age)
        val city: TextView = view.findViewById(R.id.city)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyHolder {
        val view =
            LayoutInflater.from(context).inflate(R.layout.custom_recycler_json, parent, false)
        return MyHolder(view)
    }

    override fun onBindViewHolder(holder: MyHolder, position: Int) {
        holder.name.text = empPojos[position].name
        holder.age.text = empPojos[position].age
        holder.city.text = empPojos[position].city
    }

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



// Pojo.kt

class Pojo {
    var name: String? = null
    var age: String? = null
    var city: String? = null
}