public class ExampleGameCycle implements GameCycle {

    private Graphics.LCDBitmap playerBitmap;
    private Sprite.LCDSprite player;

    @Override
    public void start() {
        playerBitmap = Graphics.loadBitmap("images/player");
        player = Sprite.newSprite();
        player.setPosition(lcd_columns / 2, lcd_rows / 2);
        player.setImage(playerBitmap, Graphics.LCDBitmapFlip.Unflipped);
        Sprite.addSprite(player);
    }

    @Override
    public void loop() {
        Graphics.clear(Graphics.LCDSolidColor.White);
        int xDir = 0;
        int yDir = 0;
        if (Input.isButton(Input.PDButtons.Up)) {
            yDir--;
        }
        if (Input.isButton(Input.PDButtons.Down)) {
            yDir++;
        }
        if (Input.isButton(Input.PDButtons.Left)) {
            xDir--;
        }
        if (Input.isButton(Input.PDButtons.Right)) {
            xDir++;
        }

        float deltaTime = Game.getDeltaTime();
        float dx = 100 * xDir * deltaTime;
        float dy = 100 * yDir * deltaTime;
        player.moveBy(dx, dy);

        Sprite.updateAndDrawSprites();
    }

    @Override
    public void stop() {
        if (player != null) {
            Sprite.removeSprite(player);
            Sprite.freeSprite(player);
            player = null;
        }
        if (playerBitmap != null) {
            Graphics.freeBitmap(playerBitmap);
            playerBitmap = null;
        }
    }
}