如何在libgdx中创建非常简单的暂停/恢复游戏

public class GameStateManager {
    private GameState currentState;

    public void setCurrentState(GameState state) {
        this.currentState = state;
    }

    public void update(float deltaTime) {
        if (currentState != null) {
            currentState.update(deltaTime);
        }
    }

    public void render(SpriteBatch spriteBatch) {
        if (currentState != null) {
            currentState.render(spriteBatch);
        }
    }
}

public interface GameState {
    void update(float deltaTime);
    void render(SpriteBatch spriteBatch);
}

public class RunningState implements GameState {
    // 实现游戏运行状态的逻辑和渲染
    // ...

    @Override
    public void update(float deltaTime) {
        // 更新游戏逻辑
    }

    @Override
    public void render(SpriteBatch spriteBatch) {
        // 渲染游戏画面
    }
}

public class PausedState implements GameState {
    // 实现游戏暂停状态的逻辑和渲染
    // ...

    @Override
    public void update(float deltaTime) {
        // 游戏暂停状态下不更新游戏逻辑
    }

    @Override
    public void render(SpriteBatch spriteBatch) {
        // 渲染当前的游戏画面
    }
}

public class MyGame extends ApplicationAdapter {
    private GameStateManager gameStateManager;

    @Override
    public void create() {
        gameStateManager = new GameStateManager();
        gameStateManager.setCurrentState(new RunningState());
    }

    @Override
    public void render() {
        float deltaTime = Gdx.graphics.getDeltaTime();

        // 更新游戏状态
        gameStateManager.update(deltaTime);

        // 渲染游戏画面
        gameStateManager.render(spriteBatch);
    }

    // 处理暂停/恢复游戏的事件
    @Override
    public boolean keyDown(int keycode) {
        if (keycode == Input.Keys.P) {
            if (gameStateManager.getCurrentState() instanceof RunningState) {
                gameStateManager.setCurrentState(new PausedState());
            } else if (gameStateManager.getCurrentState() instanceof PausedState) {
                gameStateManager.setCurrentState(new RunningState());
            }
            return true;
        }
        return false;
    }
}