On Boarding Screen With Videos

activity_on_boarding.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#E6EAEE"
    tools:context=".OnBoardingActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/vp_tutorial"
        android:layout_width="620dp"
        android:layout_height="350dp"
        android:background="@color/colorAccent"
        android:layout_centerInParent="true" />

    <LinearLayout
        android:id="@+id/dots"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_below="@id/vp_tutorial"
        android:layout_centerInParent="true"
        android:orientation="horizontal" />

    <ImageButton
        android:id="@+id/btnBack"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentEnd="true"
        android:layout_alignTop="@+id/btnNext"
        android:layout_marginEnd="325dp"
        android:onClick="setBack"
        app:srcCompat="@color/colorAccent" />

    <ImageButton
        android:id="@+id/btnNext"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true"
        android:layout_marginBottom="25dp"
        android:layout_marginStart="315dp"
        android:onClick="setNext"
        app:srcCompat="@color/colorAccent" />

</RelativeLayout>

activity_on_boarding_item.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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <VideoView
        android:id="@+id/vp_item"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true"
        />

</RelativeLayout>

OnBoardingActivity.java

package com.magarex.moviemania;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.text.Html;
import android.view.View;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.magarex.moviemania.Adapter.SliderAdapter;

public class OnBoardingActivity extends AppCompatActivity {

    public static final String COMPLETED_ONBOARDING = "completed_onboarding";
    private ViewPager vp_tutorial;
    private LinearLayout dots;
    private ImageButton btnNext, btnBack;
    private int mCurrentPage;
    ViewPager.OnPageChangeListener viewListener = new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            mCurrentPage = position;
            addDotIndicator(position);

            if (position == 0) {
                btnBack.setEnabled(false);
                btnBack.setVisibility(View.INVISIBLE);
                btnNext.setEnabled(true);
            } else if (position == 1) {
                btnBack.setEnabled(true);
                btnBack.setVisibility(View.VISIBLE);
                btnNext.setEnabled(true);
            } else if (position == 2) {
                btnBack.setEnabled(true);
                btnBack.setVisibility(View.VISIBLE);
                btnNext.setEnabled(true);
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    };

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

        vp_tutorial = findViewById(R.id.vp_tutorial);
        dots = findViewById(R.id.dots);
        btnBack = findViewById(R.id.btnBack);
        btnNext = findViewById(R.id.btnNext);

        SliderAdapter mAdapter = new SliderAdapter(OnBoardingActivity.this);
        vp_tutorial.setAdapter(mAdapter);

        addDotIndicator(0);
        vp_tutorial.addOnPageChangeListener(viewListener);
    }

    public void setNext(View view) {
        if (mCurrentPage == 1) {
            SharedPreferences.Editor sharedPreferencesEditor =
                    PreferenceManager.getDefaultSharedPreferences(OnBoardingActivity.this).edit();
            sharedPreferencesEditor.putBoolean(COMPLETED_ONBOARDING, true);
            sharedPreferencesEditor.apply();
            finish();
        } else
            vp_tutorial.setCurrentItem(mCurrentPage + 1, true);
    }

    public void setBack(View view) {
        vp_tutorial.setCurrentItem(mCurrentPage - 1, true);
    }

    public void addDotIndicator(int position) {
        TextView[] mDots = new TextView[2];
        dots.removeAllViews();

        for (int i = 0; i < mDots.length; i++) {
            mDots[i] = new TextView(OnBoardingActivity.this);
            mDots[i].setText(Html.fromHtml("&#8226"));
            mDots[i].setTextSize(35);
            mDots[i].setTextColor(getResources().getColor(R.color.shimmer_background_color));
            dots.addView(mDots[i]);
        }

        mDots[position].setTextColor(getResources().getColor(R.color.colorAccent));
    }


}

SliderAdapter.java

package com.magarex.moviemania.Adapter;

import android.content.Context;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.MediaController;
import android.widget.RelativeLayout;
import android.widget.VideoView;

import com.magarex.moviemania.R;

public class SliderAdapter extends PagerAdapter {

    private Context mContext;
    private LayoutInflater mInflator;
    private int[] videos = {
            R.raw.sample1,
            R.raw.sampletwo
    };

    public SliderAdapter(Context context) {
        this.mContext = context;
    }

    @Override
    public int getCount() {
        return videos.length;
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return view == object;
    }

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        mInflator = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = mInflator.inflate(R.layout.activity_on_boarding_item, container, false);

        VideoView vp_item = view.findViewById(R.id.vp_item);
        MediaController mediaController = new MediaController(mContext);
        mediaController.setAnchorView(vp_item);
        vp_item.setMediaController(mediaController);
        vp_item.setVideoURI(Uri.parse("android.resource://" + mContext.getPackageName()+ "/" + videos[position]));

        vp_item.start();

        container.addView(view);

        return view;
    }

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((RelativeLayout) object);
    }
}