Android 自定义事件监听器 [英] Android Custom Event Listener

问题描述

我在 Android 应用程序中使用 AndEngine 和 Box2d.
如何让我的对象Player"抛出一个事件并且GameScene"订阅它?

I'm using AndEngine and Box2d in android application.
How to make my object "Player" to throw an event and the "GameScene" subscribes to it?

public class Player {

  @Override
  public void Collision(GameObject object) {
    if(object instanceof Coin) {
        //throws an event here
    }
  }
}

public class GameScene {
  private Player player = new Player();
  //catch the event here

}

推荐答案

你应该使用interfaces.

制作一个类似的界面:

public interface Something
{
  void doSomething(GameObject object);
}

其中 doSomething 是将被调用的方法(在这种情况下可能是 objectCollision)对于接口名称(ObjectCollider(?)).

Where doSomething is the method which will be called (In this case could be objectCollision) same for interface name (ObjectCollider(?)).

然后让 GameScene 实现它

then let GameScene implement it

public class GameScene implements Something

并实现该方法.

在 Player 类中，为此添加一个侦听器:

In the Player class, add a listener to this:

public class Player {
 private Something listener;

并在构造函数中请求监听器:

And in the constructor ask for the listener:

public Player(Something listener) { this.listener = listener; }

然后调用它，只需使用

listener.doSomething(object);

示例:

public void Collision(GameObject object) {
   if(object instanceof Coin) {
     //throws an event here
     listener.doSomething(object);
   }
}

要使用此构造函数创建 Player 对象，您只需要执行以下操作:

To create the Player object with this constructor you just need to do:

Player player = new Player(this); // if you implement the method in the class

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