11. Recycler View in Android Studio Explained with Example

 1. Manifest 

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

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@drawable/contactsvg"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.RecyclerviewExample"
        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>

2. Xml 

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

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

</LinearLayout>

3. Java

3.1. Main java:

  package com.example.recyclerviewexample;

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

import android.os.Bundle;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
RecyclerView recyclertxt;
ArrayList<ContactModel> arrContact = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclertxt = findViewById(R.id.recyclertxt);
        recyclertxt.setLayoutManager(new LinearLayoutManager(this) );

        //Yeh hum tb use krty hain jb hum aik value ko bar bar istimal krna ho
        // ContactModel model = new ContactModel(R.drawable.a, "Ali", "03041139358");
        arrContact.add(new ContactModel(R.drawable.a, "Ali", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.b, "Aslam", "030411334454"));
        arrContact.add(new ContactModel(R.drawable.c, "Haider", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.d, "Noman", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.a, "Ali", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.b, "Aslam", "030411334454"));
        arrContact.add(new ContactModel(R.drawable.c, "Haider", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.d, "Noman", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.a, "Ali", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.b, "Aslam", "030411334454"));
        arrContact.add(new ContactModel(R.drawable.c, "Haider", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.d, "Noman", "03041139358"));

        RecyclerContactAdapter adapter = new RecyclerContactAdapter(this, arrContact);
        recyclertxt.setAdapter(adapter);
    }
}

3.2. RecyclerContactAdaptor(User Define Adaptor): 

package com.example.recyclerviewexample;

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

import java.util.ArrayList;

public class RecyclerContactAdapter extends RecyclerView.Adapter<RecyclerContactAdapter.ViewHolder> {

    ArrayList<ContactModel> arrContacts;
    Context context;
    RecyclerContactAdapter(Context context, ArrayList<ContactModel> arrContacts){
        this.context = context;
        this.arrContacts = arrContacts;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
    holder.imgContact.setImageResource(arrContacts.get(position).img);
    holder.txtName.setText(arrContacts.get(position).Name);
    holder.txtNumber.setText(arrContacts.get(position).Number);
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder{

        TextView txtName, txtNumber;
        ImageView imgContact;
        public ViewHolder(View itemView){
            super(itemView);

            txtName = itemView.findViewById(R.id.txtName1);
            txtNumber = itemView.findViewById(R.id.txtName2);
            imgContact = itemView.findViewById(R.id.imgContact);
        }
    }
}

3.3. Contact_Model:

package com.example.recyclerviewexample;

public class ContactModel {
    int img;
    String Name, Number;
    public ContactModel(int img, String Name, String Number){
        this.img = img;
        this.Name = Name;
        this.Number = Number;
    }
}