1

package com.android_examples.horizontalrecyclerview_android_examplescom;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;
    ArrayList<String> Number;
    RecyclerView.LayoutManager RecyclerViewLayoutManager;
    RecyclerViewAdapter RecyclerViewHorizontalAdapter;
    LinearLayoutManager HorizontalLayout ;
    View ChildView ;
    int RecyclerViewItemPosition ;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = (RecyclerView)findViewById(R.id.recyclerview1);

        RecyclerViewLayoutManager = new LinearLayoutManager(getApplicationContext());

        recyclerView.setLayoutManager(RecyclerViewLayoutManager);

        // Adding items to RecyclerView.
        AddItemsToRecyclerViewArrayList();

        RecyclerViewHorizontalAdapter = new RecyclerViewAdapter(Number);

        HorizontalLayout = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.HORIZONTAL, false);
        recyclerView.setLayoutManager(HorizontalLayout);

        recyclerView.setAdapter(RecyclerViewHorizontalAdapter);


        // Adding on item click listener to RecyclerView.
        recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {

            GestureDetector gestureDetector = new GestureDetector(MainActivity.this, new GestureDetector.SimpleOnGestureListener() {

                @Override public boolean onSingleTapUp(MotionEvent motionEvent) {

                    return true;
                }

            });
            @Override
            public boolean onInterceptTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) {

                ChildView = Recyclerview.findChildViewUnder(motionEvent.getX(), motionEvent.getY());

                if(ChildView != null && gestureDetector.onTouchEvent(motionEvent)) {

                    //Getting clicked value.
                    RecyclerViewItemPosition = Recyclerview.getChildAdapterPosition(ChildView);

                    // Showing clicked item value on screen using toast message.
                    Toast.makeText(MainActivity.this, Number.get(RecyclerViewItemPosition), Toast.LENGTH_LONG).show();

                }

                return false;
            }

            @Override
            public void onTouchEvent(RecyclerView Recyclerview, MotionEvent motionEvent) {

            }

            @Override
            public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

            }
        });

    }

    // function to add items in RecyclerView.
    public void AddItemsToRecyclerViewArrayList(){

        Number = new ArrayList<>();
        Number.add("ONE");
        Number.add("TWO");
        Number.add("THREE");
        Number.add("FOUR");
        Number.add("FIVE");
        Number.add("SIX");
        Number.add("SEVEN");
        Number.add("EIGHT");
        Number.add("NINE");
        Number.add("TEN");

    }
}