Handling the removal of an entity from the game

Detaching entities within an update handler can occasionally throw an IndexOutOfBoundsException exception, because the entity is removed in the middle of an engine update. To avoid that exception, we create a Runnable parameter that is run last on the update thread, after all other updating has occurred. In this recipe, we will safely remove an entity from the game by using the BaseGameActivity class' runOnUpdateThread() method.

Getting ready...

Create a new class named HandlingRemovalOfEntityActivity that extends BaseGameActivity. We will use this class to learn how to safely remove an entity from an update handler.

How to do it...

Follow these steps to see how we can remove an entity from its parent without throwing an exception:

1. Insert the following definitions into the HandlingRemovalOfEntityActivity class:

   public static int cameraWidth = 800;
   public static int cameraHeight = 480;
   public Scene mScene;
   public Rectangle spinningRect;
   public float...