RecyclerView using Fragments in Android

Pratap SharmaApril 19th, 20207 mins read

Firstly let's get started by creating a new project in Android Studio. Select Empty Activity and click on next.
Select the name of the project and make sure to use a unique name for the package name then select the language as Java and then select the minimum API level.

Since we are working with RecyclerView we need to add RecyclerView in our dependency file in (Module:app) build.gradle file as follow.

  implementation 'com.android.support:recyclerview-v7:28.0.0'
  implementation 'com.android.support:cardview-v7:28.0.0'

After adding the dependencies click the button sync now

Now, wait for the file to get build. After the project is built successfully then let us start with our activity_main.xml file.

Firstly add a RecyclerView in activity_main.xml file and now it should look like this.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</android.support.constraint.ConstraintLayout>
(activity_main.xml)

Now let us create a new fragment in layout and name it fragment_explore.

RightClick on package -> new -> fragment -> with(viewModel). Then add recyclerView in the fragment. The fragment_explore.xml should look like this.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">
    <android.support.v7.widget.RecyclerView
        android:id="@+id/exploreRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical"
        />
</android.support.constraint.ConstraintLayout>
(fragment_explore.xml)

Now create a new Layout and name it explore_list.

Right click on the layout -> new -> layout resource file select name and then click on ok.

Now add the following to explore_list.xml file.

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:cardCornerRadius="4dp">
    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="4dp">
        <ImageView
            android:id="@+id/imageView"
            android:contentDescription="Image"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginBottom="8dp"
            android:padding="2dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:srcCompat="@tools:sample/backgrounds/scenic" />
        <TextView
            android:layout_width="wrap_content"
            android:id="@+id/textView"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:text="Test"
            android:textSize="20sp"
            app:layout_constraintBottom_toBottomOf="@+id/imageView"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/imageView"
            app:layout_constraintTop_toTopOf="@+id/imageView"
            android:textStyle="bold"
            android:textColor="@android:color/black"/>
    </android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
(explore_list.xml)

Create a new class ExploreList.java. This class will contain the lists of images and text for the list of RecyclerView. ExploreList class will look like this. I've added a few icons in the drawable folder for the reference of images.

package com.example.myimagenes.hamronepal;

public class ExploreList {
   public static String[] text = new String[]{
           "First", "Second", "Third", "Fourth", "Fifth", "Sixth", "Seventh", "Eighth", "Nineth", "Tenth"
   };
   public  static  int[] images = new int[]{
           R.drawable.ic_contacts_black_24dp,
           R.drawable.ic_face_black_24dp,
           R.drawable.ic_home_black_24dp,
           R.drawable.ic_contacts_black_24dp,
           R.drawable.ic_face_black_24dp,
           R.drawable.ic_home_black_24dp,
           R.drawable.ic_contacts_black_24dp,
           R.drawable.ic_face_black_24dp,
           R.drawable.ic_home_black_24dp,
           R.drawable.ic_home_black_24dp
    };
}

Create a new class ListAdapter.java This class will set values for items in RecyclerView. Whenever recycler view will call ListAdapter it will return a new item for that view. The ListAdapter class will look like this.

package com.example.myimagenes.hamronepal;

import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

public class ListAdapter extends RecyclerView.Adapter {

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.explore_list, viewGroup, false);
        return  new ListViewHolder(view);
    }
    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
        ((ListViewHolder) viewHolder).bindView(i);
    }
    @Override
    public int getItemCount() {
        return ExploreList.text.length;
    }
    private class ListViewHolder extends  RecyclerView.ViewHolder implements View.OnClickListener {
        private TextView mTextView;
        private ImageView mImageView;
        public ListViewHolder(View view){
            super(view);
            mTextView = view.findViewById(R.id.textView);
            mImageView = view.findViewById(R.id.imageView);
            view.setOnClickListener(this);
        }
        public void bindView (int position){
            mTextView.setText(ExploreList.text[position]);
            mImageView.setImageResource(ExploreList.images[position]);
        }
        public void onClick(View view){
            Log.d("Some Tag", "Clicked: " + view.toString());
        }
    }
}

Add the following code in ExploreFragment java class.

package com.example.myimagenes.hamronepal;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class ExploreFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view =  inflater.inflate(R.layout.fragment_explore, container, false);
        RecyclerView recyclerView = view.findViewById(R.id.exploreRecyclerView);

        //creating object of List adapter
        ListAdapter listAdapter = new ListAdapter();
        //Setting adapter of recyclerview by object listadapter
        recyclerView.setAdapter(listAdapter);
        //Creating a layoutmanager
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
        //Setting a layout manager
        recyclerView.setLayoutManager(layoutManager);
        return view;
    }

}

Now let's make the following changes in MainActivity class.

package com.example.myimagenes.hamronepal;

import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
        bottomNav.setOnNavigationItemSelectedListener(navListener);
        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new HomeFragment()).commit();
    }
}

The Final output will look like this.

Summary

We completed the followings:

Adding dependencies
Adding RecyclerView and CardView in our layout files.
Added a fragment
Created Adapter which would return an item to the RecyclerView.

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Please let me know if there's anything else I can add or if there's any way to improve the post. Also, leave a comment if you have any feedback or suggestions.

RecyclerView using Fragments in Android

Summary

System Design Series

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