How to add full screen button to MediaController?

Question

I have a videoView in my app and I want to create a button that clicking him makes the videoView to be full screen. I have a MediaController but it only has resume/pause and rewind/forward. I want to add a full screen button to it.

My xml:

<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"
    tools:context=".video_activity">

    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        >
        <VideoView
            android:id="@+id/video1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
    </FrameLayout>
</RelativeLayout>

Java code:

 public class video_activity extends AppCompatActivity  {
     VideoView videoView;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_video);
            videoView=findViewById(R.id.video1);
    
            Uri uri=Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.dumbell_press);
            videoView.setVideoURI(uri);
    
            MediaController mediaController=new MediaController(this);
            videoView.setMediaController(mediaController);
            mediaController.setAnchorView(videoView);
    }