Working with Recycler View in Android App

Android Apps/Applications Mobile Development

This example demonstrates about Working with Recycler View in Android App

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/rlMain"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:layout_margin="16dp"
   android:orientation="vertical">
   <androidx.recyclerview.widget.RecyclerView
      android:id="@+id/recyclerView"
      android:layout_width="match_parent"
      android:layout_height="match_parent" />
</LinearLayout>

Step 3 − Add the following code to src/MainActivity.java

package app.com.sample;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.DefaultItemAnimator;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
   private List<MovieModel> movieList = new ArrayList<>();
   private MoviesAdapter mAdapter;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      RecyclerView recyclerView = findViewById(R.id.recyclerView);
      mAdapter = new MoviesAdapter(movieList);
      LinearLayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
      recyclerView.setLayoutManager(mLayoutManager);
      recyclerView.setItemAnimator(new DefaultItemAnimator());
      recyclerView.setAdapter(mAdapter);
      prepareMovieData();
   }
   private void prepareMovieData() {
      MovieModel movie = new MovieModel("Mad Max: Fury Road", "Action & Adventure", "2015");
      movieList.add(movie);
      movie = new MovieModel("Inside Out", "Animation, Kids & Family", "2015");
      movieList.add(movie);
      movie = new MovieModel("Star Wars: Episode VII - The Force Awakens", "Action", "2015");
      movieList.add(movie);
      movie = new MovieModel("Shaun the Sheep", "Animation", "2015");
      movieList.add(movie);
      movie = new MovieModel("The Martian", "Science Fiction & Fantasy", "2015");
      movieList.add(movie);
      movie = new MovieModel("Mission: Impossible Rogue Nation", "Action", "2015");
      movieList.add(movie);
      movie = new MovieModel("Up", "Animation", "2009");
      movieList.add(movie);
      movie = new MovieModel("Star Trek", "Science Fiction", "2009");
      movieList.add(movie);
      movie = new MovieModel("The LEGO MovieModel", "Animation", "2014");
      movieList.add(movie);
      movie = new MovieModel("Iron Man", "Action & Adventure", "2008");
      movieList.add(movie);
      movie = new MovieModel("Aliens", "Science Fiction", "1986");
      movieList.add(movie);
      movie = new MovieModel("Chicken Run", "Animation", "2000");
      movieList.add(movie);
      movie = new MovieModel("Back to the Future", "Science Fiction", "1985");
      movieList.add(movie);
      movie = new MovieModel("Raiders of the Lost Ark", "Action & Adventure", "1981");
      movieList.add(movie);
      movie = new MovieModel("Goldfinger", "Action & Adventure", "1965");
      movieList.add(movie);
      movie = new MovieModel("Guardians of the Galaxy", "Science Fiction & Fantasy", "2014");
      movieList.add(movie);
      mAdapter.notifyDataSetChanged();
   }
}

Step 4 − Add the following code to src/MovieModel.java

package app.com.sample;
public class MovieModel {
   private String title, genre, year;
   public MovieModel() {
   }
   public MovieModel(String title, String genre, String year) {
      this.title = title;
      this.genre = genre;
      this.year = year;
   }
   public String getTitle() {
      return title;
   }
   public void setTitle(String name) {
      this.title = name;
   }
   public String getYear() {
      return year;
   }
   public void setYear(String year) {
      this.year = year;
   }
   public String getGenre() {
      return genre;
   }
   public void setGenre(String genre) {
      this.genre = genre;
   }
}

Step 5 − Add the following code to res/layout/movies_list.xml.

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width=" match_parent"
   android:layout_height="100dp"
   android:layout_margin="8dp">
   <RelativeLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:padding="8dp">
      <TextView
         android:id="@+id/title"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentStart="true"
         android:layout_toStartOf="@+id/year"
         android:textColor="#222222"
         android:textSize="16sp"
         android:textStyle="bold" />
      <TextView
         android:id="@+id/year"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentEnd="true"
         android:textColor="#999999" />
      <TextView
         android:id="@+id/genre"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true" />
   </RelativeLayout>
</androidx.cardview.widget.CardView>

Step 6 − Add the following code to src/MoviesAdapter.java

package app.com.sample;
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.List;
public class MoviesAdapter extends RecyclerView.Adapter<MoviesAdapter.MyViewHolder> {
   private List<MovieModel> moviesList;
   class MyViewHolder extends RecyclerView.ViewHolder {
      TextView title, year, genre;
      MyViewHolder(View view) {
         super(view);
         title = view.findViewById(R.id.title);
         genre = view.findViewById(R.id.genre);
         year = view.findViewById(R.id.year);
      }
   }
   public MoviesAdapter(List<MovieModel> moviesList) {
      this.moviesList = moviesList;
   }
   @NonNull
   @Override
   public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
      View itemView = LayoutInflater.from(parent.getContext())
      .inflate(R.layout.movie_list, parent, false);
      return new MyViewHolder(itemView);
   }
   @Override
   public void onBindViewHolder(MyViewHolder holder, int position) {
      MovieModel movie = moviesList.get(position);
      holder.title.setText(movie.getTitle());
      holder.genre.setText(movie.getGenre());
      holder.year.setText(movie.getYear());
   }
   @Override
   public int getItemCount() {
      return moviesList.size();
   }
}

Step 7 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="app.com.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and Click Run Icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –