libgdx maintaing aspect ratio

package hacks;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.backends.lwjgl.LwjglApplication;
import com.badlogic.gdx.backends.lwjgl.LwjglApplicationConfiguration;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.Pixmap.Format;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class AspectRatioDemoMain extends com.badlogic.gdx.Game {

    private static final int TEXTURE_WIDTH = 64;
    private static final int TEXTURE_HEIGHT = 32;
    private static final float SPRITE_WIDTH = 0.5f;

    private OrthographicCamera camera;

    private SpriteBatch spriteBatch;
    private Sprite sprite;
    private Texture texture;

    @Override
    public void create() {
        camera = new OrthographicCamera();

        Pixmap pixmap = new Pixmap(TEXTURE_WIDTH, TEXTURE_HEIGHT,
                Format.RGBA8888);
        pixmap.setColor(Color.WHITE);
        pixmap.fillRectangle(0, 0, TEXTURE_WIDTH, TEXTURE_HEIGHT);

        texture = new Texture(pixmap);

        sprite = new Sprite(texture);
        sprite.setSize(SPRITE_WIDTH, SPRITE_WIDTH * TEXTURE_HEIGHT / TEXTURE_WIDTH);
        sprite.setPosition(-0.5f * sprite.getWidth(), -0.5f * sprite.getHeight());
        sprite.setColor(0f, 1f, 0f, 1f);

        spriteBatch = new SpriteBatch();
    }

    @Override
    public void resize(int width, int height) {
        super.resize(width, height);

        float cameraWidth = Gdx.graphics.getWidth();
        float cameraHeight = Gdx.graphics.getHeight();
        float aspect = cameraWidth / cameraHeight;
        camera.setToOrtho(false, 1.0f, 1.0f / aspect);
        camera.position.set(0, 0, 0);
    }

    @Override
    public void render() {
        super.render();
        Gdx.gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
        camera.update();
        spriteBatch.setProjectionMatrix(camera.combined);
        spriteBatch.begin();
        sprite.draw(spriteBatch);
        spriteBatch.end();
    }

    public static void main(String[] args) {
        LwjglApplicationConfiguration config = new LwjglApplicationConfiguration();

        config.title = AspectRatioDemoMain.class.getName();
        config.width = 800;
        config.height = 480;
        config.fullscreen = false;
        config.useGL20 = true;
        config.useCPUSynch = true;
        config.forceExit = true;
        config.vSyncEnabled = true;

        new LwjglApplication(new AspectRatioDemoMain(), config);
    }
}