This video provides the steps to show an image in full screen model for your Android TV App.

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Complete source code and other details:

package com.programmerworld.imageinfullscreenmodeinandroidtv;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

import java.io.IOException;
import java.io.InputStream;

public class MainActivity extends AppCompatActivity {
    private ImageView imageView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView = findViewById(R.id.imageView);
    }

    public void buttonImageShow(View view){
        try {
            InputStream inputStream = getAssets().open("flower.jpg");
            Bitmap bitmapImage = BitmapFactory.decodeStream(inputStream);
            imageView.setImageBitmap(bitmapImage);
            imageView.setVisibility(View.VISIBLE);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="288dp"
        android:layout_height="76dp"
        android:layout_marginStart="336dp"
        android:layout_marginTop="56dp"
        android:onClick="buttonImageShow"
        android:text="Image in Full Screen Mode"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="invisible"
        app:srcCompat="@drawable/ic_launcher_background"
        tools:layout_editor_absoluteX="90dp"
        tools:layout_editor_absoluteY="0dp" />
</androidx.constraintlayout.widget.ConstraintLayout>

Screenshots: