调用MainActivity.java的方法在事件发生在一个库文件 [英] Call a method in MainActivity.java on event that happens in a library file

问题描述

我包括图书馆滑动式，卡在我的Andr​​oid项目的。在MainActvitiy.java在的onCreate 方法包括这样的事情：

I included the library Swipeable-Cards in my android project. In MainActvitiy.java the onCreate method includes something like that:

SimpleCardStackAdapter adapter = new SimpleCardStackAdapter(this);

//This should also be done on an event in the library class:
adapter.add(new CardModel("Title2", "Description2 goes here", r.getDrawable(R.drawable.picture2)));

现在，在CardContainer.java（属于滑动式卡库）有上，我希望有一个新的产品加入到适配器 adapter.add（...）<事件/ code>。该适配器是在MainActvitiy.java定义，你可以看到上面。
我怎样才能做到这一点？

Now, in the CardContainer.java (which belongs to the swipeable cards library) there is an event on which I want a new item added to the adapteradapter.add(...). The adapter was defined in the MainActvitiy.java as you can see above. How can I achieve this?

我首先想到的有关定义在MainActivity一种新的方法，然后从我的图书馆级调用它，这样的：

I first thought about defining a new method in MainActivity and then calling it from my library-class, like that:

public void callfromlibrary() {
    adapter.add(...);
}

然而则方法和适配器需要定义静态的，另外不知道如何使MainActivity的这种方法在CardContainer.java可用。

However then the method and the adapter need to be defined static, additionally I don't know how to make this method of MainActivity available in CardContainer.java.

我相信我需要创建样的听众在什么CardContainer.java发生在MainActivity检查？我不知道如何做到这一点。

I believe I need to create kind of a listener to check in the MainActivity what happens in CardContainer.java? I don't know how to do this.

任何帮助AP preciated！

Any help is appreciated!

推荐答案

要允许 CardContainer 高达传达给 MainActivity ，您可以定义 CardContainer 和 MainActivity 。当事件在 CardContainer 发生时，它可以调用，以便将 CardModel 添加到adapater接口方法。

To allow CardContainer to communicate up to the MainActivity, you define an interface in CardContainer and implement it in MainActivity. When the event occurs in CardContainer, it can then call Interface method in order to add the CardModel to the adapater.

public class CardContainer extends ... {

   CardContainerEventListener mCallback;

   // Define a interface
   public interface CardContainerEventListener {
       public void addToAdapter();
   }

   // Method to register callback
   void registerCallback(Activity callback) {
       mCallback = (CardContainerEventListener) callback;
   }

   void someFunction() {
       // Event got generated, invoke callback method
       mCallback.addToAdapter(); 
   }
}

public class MainActivity extends Activity implements CardContainer.CardContainerEventListener {

    // Ensure you register MainActivity with CardContainer, by calling 
    // cardContainer.registerCallback(this)

    public void addToAdapter() {
       adapter.add(...);
    }   

}

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