返回回调（从CustomView内打开DialogFragment） [英] Return a callback (Open a DialogFragment from within a CustomView)

问题描述

这关系到我的previous这里的问题：<一href=\"http://stackoverflow.com/questions/18061993/open-a-dialogfragment-from-within-a-customview/18062221?noredirect=1#18062221\">Open从CustomView 内DialogFragment

This is related to my previous question here: Open a DialogFragment from within a CustomView

我现在需要使用一个回调从我DialogFragment返回一个值。据我所知，这样的事情通常做的：

I now need to use a callback to return a value from my DialogFragment. I understand that something like this is commonly done:

public class MyDialogFragment extends DialogFragment {

public interface onMultipleSelectionFragmentCloseListener {
    public void onMultipleSelectionFragmentOkay();
}

onMultipleSelectionFragmentCloseListener mListener;

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mListener = (onMultipleSelectionFragmentCloseListener) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString() + " must implement onMultipleSelectionFragmentCloseListener");
    }
}
....
// to use it
mListener.onMultipleSelectionFragmentOkay();

当你想要一个活动来实现和接收回调是这样的话。但是，如果我想的自定义内容做的（比如我在previous问题）？

That's the case when you want a Activity to implement and receive the callback. But, what if I want a custom view to do that (such as in my previous question)?

推荐答案

您做的东西─你创建一个界面像上面一样。你一直到该接​​口类型的变量的引用。那你有某种功能registerListener，需要一个侦听器对象，并将其存储以便以后可以调用它。

You do the same thing- you create an interface like above. You keep a reference to a variable of that interface type. Then you have some function registerListener that takes a listener object and stores it so you can call it later.

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