libGDX使touchDown循环直到touchUp

Question

我正在用libGDX制作游戏.

我想实现游戏控制,但我的touchDown方法有问题.touchDown方法只运行一次.我想在touchDown中循环,直到调用touchUp.有人能帮我吗 ？

class  onPlayerGoLeftListener extends InputListener {

    public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
        //start runnable   (move player)     

        return true;
    }

    public void touchUp (InputEvent event, float x, float y, int pointer, int button) {
        //stop runnable
    }

}

谢谢

ps我不喜欢使用主更新方法来做到这一点

Answer 1

您无法在事件回调内"循环"或渲染回调,因为整个系统将停止.获得所需内容的一种方法是在touchDown方法中设置一个标志,清除方法中的标志touchUp,然后将循环的"主体"放入render,由您的标志保护.

boolean touchActive = false;

public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
   //start runnable   (move player)     
   touchActive = true;
   return true;
}

public void touchUp (InputEvent event, float x, float y, int pointer, int button) {
   //stop runnable
   touchActive = false;
}


public void render(float delta) {
   ...
   if (touchActive) {
      // Do one iteration of your "while" loop
   }
   ...
}