public abstract class GameView

A GPU accelerated game surface: a com.codename1.gpu.RenderView that hosts a SpriteRenderer over a Scene and calls your #update(double) once per frame.

Subclass it, build your world by adding Sprites to #getScene(), advance the game in #update(double), add the view to a com.codename1.ui.Form and call #start():

class MyGame extends GameView {
    final Sprite player = new Sprite(playerImage);
    MyGame() { getScene().add(player); player.setPosition(160, 240); }

    protected void update(double dt) {
        if (getInput().isGameKeyDown(Display.GAME_RIGHT)) {
            player.setX(player.getX() + 200 * dt);   // 200 px/second
        }
    }
}

Form f = new Form("Game", new BorderLayout());
MyGame game = new MyGame();
f.add(BorderLayout.CENTER, game);
f.show();
game.start();

Rendering is GPU driven: the underlying RenderView runs the frame loop (a display link on device, the software rasterizer in the simulator), so there is no EDT busy loop. Drawing is handled for you by the SpriteRenderer – you only position sprites. The deltaSeconds passed to #update(double) is the wall clock time since the previous frame; multiply movement by it to stay framerate independent. With #setFixedTimestep(double) the update is stepped at a fixed interval for deterministic physics, and #getInterpolationAlpha() gives a 0..1 blend factor.

#update(double) runs on the render thread together with drawing. Keep it non blocking – offload asset loading to a background thread and hand the result back with com.codename1.ui.CN#callSerially(java.lang.Runnable).