VideoView control Android

VideoView  control Android
************************ Main.xml *********************************

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"

    tools:context=".MainActivity">

   <VideoView
       android:layout_width="fill_parent"
       android:layout_height="300dp"
       android:id="@+id/video"/>
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Play"
        android:id="@+id/btn"/>

</LinearLayout>

***************************** Main .java ******************************

package com.example.videoview;

import androidx.appcompat.app.AppCompatActivity;

import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.VideoView;

public class MainActivity extends AppCompatActivity {
Button play;
VideoView videoView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        play=(Button) findViewById(R.id.btn);
        videoView=(VideoView)findViewById(R.id.video);
        play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                videoView.setVideoURI(Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.a));
                videoView.start();
            }
        });
    }
}