从多个片段活动传递的ArrayList [英] Passing arraylist from multiple fragments to activity

问题描述

我从previous问题的后续问题。

I have a follow up question from my previous questions.

我的应用程序启动和加载片段，它通过ArrayList中正确使用接口和监听方法。现在，当我的导航按钮，单击另一个片段，以取代当前片段...这片段是完全一样的第一个片段，但不同的数组列表...我怎么会更新活动ArrayList中？

My app starts and fragment loads, it passes in the arraylist correctly using interface and listener method .. Now when I click on navigation button to replace current fragment with another fragment... That fragment is exactly the same as first fragment but with different array list... How would I update the arraylist in activity?

我得到一个classcast例外。

I get a classcast exception.

下面是如何我的两个片段实施

Here are how both of my fragments are implemented

通行证的ArrayList从片段自身活动

推荐答案

在抛出ClassCastException而言，你要确保有你MainActivity（从知道其MainActivity.java:107 MainActivity）实施OnFragmentInteractionListener？如果不这样做，可能是为什么你得到了ClassCastException异常，因为你想你的活动实例（getActivity）转换为其中不共享（OnFragmentInteractionListener）

In terms of the ClassCastException, did you make sure to have your MainActivity(know its MainActivity from MainActivity.java:107) implement the OnFragmentInteractionListener? If you don't that could be why you're getting that ClassCastException, because you're trying to cast your an activity instance(getActivity) to a subclass of which it does not share any inheritance relationship with (OnFragmentInteractionListener)

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