Android RecyclerView Example

Android RecyclerView Example

1/ Create  A New Project add xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

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


 

2/  Add a array in MainAcitivity

package com.example.conditiontest;

import android.os.Bundle;


import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;


public class MainActivity extends AppCompatActivity {
    ArrayList bookList = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);

        bookList.add("Java Book");
        bookList.add("Kotlin Book");
        bookList.add("Jeetpak Book");


        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(linearLayoutManager);
        
     
    }
    

}

 

3/ Add an Adapter Class CustomClass

package com.example.conditiontest;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;

public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MyViewHolder> {
    ArrayList bookName;
    Context context;
    public CustomAdapter(Context context, ArrayList bookName) {
        this.context = context;
        this.bookName = bookName;
    }
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_lay, parent, false);
        MyViewHolder vh = new MyViewHolder(v);
        return vh;
    }



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

        holder.name.setText(bookName.get(position).toString());

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(context, bookName.get(position).toString(), Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public int getItemCount() {
        return bookName.size();
    }
    public class MyViewHolder extends RecyclerView.ViewHolder {
        TextView name;// init the item view's
        public MyViewHolder(View itemView) {
            super(itemView);
            // get the reference of item view's
            name = (TextView) itemView.findViewById(R.id.name);
        }
    }
}


 

4/ Add a xml for item card_lay.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_marginTop="50dp"
    android:layout_marginLeft="10dp"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"

        android:orientation="vertical">

        <TextView
            android:id="@+id/name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:text="Name" />
    </LinearLayout>
</RelativeLayout>


 

5/ In MainActivity Crate CustomAdapter object and set Adapter

package com.example.conditiontest;

import android.os.Bundle;


import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;


public class MainActivity extends AppCompatActivity {
    ArrayList bookList = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);

        bookList.add("Java Book");
        bookList.add("Kotlin Book");
        bookList.add("Jeetpak Book");


        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(linearLayoutManager);
        
        CustomAdapter customAdapter=new CustomAdapter(MainActivity.this,bookList);// Create Object and set Adapter
        recyclerView.setAdapter(customAdapter);
        
     
    }
    

}