RecyclerView with Header and Footer

HeaderFooterRecyclerAdapter.java

package com.prasanna.recyclerview.samples;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.LinkedList;
import java.util.List;

/**
 * Created by prasanna on 10/11/16.
 */

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

    private List<App> mApps;

    // You can keep you own header and footer objects
    private String mHeader;
    private String mFooter;

    private List<Integer> mActualPositions;

    public interface OnItemClickListener {
        void onHeaderClicked();

        void onFooterClicked();

        void onItemClicked(App app);
    }

    private OnItemClickListener mOnItemClickListener;

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case R.layout.item_header:
                return new HeaderFooterRecyclerAdapter.HeaderViewHolder(LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.item_header, parent, false));
            case R.layout.item_footer:
                return new HeaderFooterRecyclerAdapter.FooterViewHolder(LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.item_footer, parent, false));
            case R.layout.item:
                return new HeaderFooterRecyclerAdapter.ItemViewHolder(LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.item, parent, false));
            default:
                return null;
        }
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        int pos = mActualPositions.get(position);

        switch (pos) {
            case R.layout.item_header:
                HeaderViewHolder headerView = (HeaderViewHolder) holder;
                headerView.textViewTitle.setText(mHeader);
                break;
            case R.layout.item_footer:
                FooterViewHolder footerView = (FooterViewHolder) holder;
                footerView.textViewTitle.setText(mFooter);
                break;
            default:
                ItemViewHolder itemView = (ItemViewHolder) holder;
                itemView.textViewTitle.setText(mApps.get(pos).title);
                itemView.textViewRating.setText(mApps.get(pos).rating);
        }
    }

    @Override
    public int getItemCount() {
        return mApps == null ? 0 : mApps.size() + 2;
    }

    @Override
    public int getItemViewType(int position) {
        if (position == 0) return R.layout.item_header;
        if (position == mApps.size() + 1) return R.layout.item_footer;
        return R.layout.item;
    }

    public void setData(List<App> apps, String header, String footer) {
        mApps = apps;
        int size = apps.size();
        mActualPositions = new LinkedList<>();
        mActualPositions.add(R.layout.item_header);
        for (int i = 0; i < size; i++) mActualPositions.add(i);
        mActualPositions.add(R.layout.item_footer);

        mHeader = header;
        mFooter = footer;

        notifyDataSetChanged();
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        mOnItemClickListener = listener;
    }

    private class HeaderViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        final TextView textViewTitle;
        final TextView textViewSubTitle;

        HeaderViewHolder(View itemView) {
            super(itemView);

            textViewTitle = (TextView) itemView.findViewById(R.id.text_view_title);
            textViewSubTitle = (TextView) itemView.findViewById(R.id.text_view_sub_title);

            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (mOnItemClickListener == null) return;
            mOnItemClickListener.onHeaderClicked();
        }
    }

    private class FooterViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        final TextView textViewTitle;
        final TextView textViewSubTitle;

        FooterViewHolder(View itemView) {
            super(itemView);

            textViewTitle = (TextView) itemView.findViewById(R.id.text_view_title);
            textViewSubTitle = (TextView) itemView.findViewById(R.id.text_view_sub_title);

            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (mOnItemClickListener == null) return;
            mOnItemClickListener.onFooterClicked();
        }
    }

    private class ItemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        final TextView textViewTitle;
        final TextView textViewRating;

        ItemViewHolder(View itemView) {
            super(itemView);

            textViewTitle = (TextView) itemView.findViewById(R.id.text_view_title);
            textViewRating = (TextView) itemView.findViewById(R.id.text_view_sub_title);

            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (mOnItemClickListener == null) return;

            int pos = mActualPositions.get(getAdapterPosition());
            mOnItemClickListener.onItemClicked(mApps.get(pos));
        }
    }
}

item.xml

<?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"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="@dimen/activity_horizontal_margin">

        <TextView
            android:id="@+id/text_view_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:textStyle="bold"
            tools:text="Jalebi - A Desi Word Game" />

        <TextView
            android:id="@+id/text_view_sub_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:text="1M Downloads" />

    </LinearLayout>
</android.support.v7.widget.CardView>

item_footer.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    android:padding="@dimen/activity_horizontal_margin">

    <TextView
        android:id="@+id/text_view_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:textStyle="bold"
        tools:text="Games" />

    <TextView
        android:id="@+id/text_view_sub_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:text="Recommended for you" />

</LinearLayout>

item_header.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    android:padding="@dimen/activity_horizontal_margin">

    <TextView
        android:id="@+id/text_view_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:textStyle="bold"
        tools:text="Games" />

    <TextView
        android:id="@+id/text_view_sub_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:text="Recommended for you" />

</LinearLayout>