与片段处理方向更改 [英] Handling orientation changes with Fragments

问题描述

我目前正在测试我有multipane 片段使用HC兼容包-ised视图的应用程序，并且有很多的困难处理的方向变化。

I'm currently testing my app with a multipane Fragment-ised view using the HC compatibility package, and having a lot of difficultly handling orientation changes.

我的主机的活动有2个窗格景观（menu​​Frame 和 contentFrame C $ C>），只有 menuFrame 的肖像，到适当的片段被加载。如果我有东西两个窗格，但随后改变方向为纵向，我收到了NPE，因为它试图加载意见的片段，将在（不存在） contentFrame 。在内容片段使用 setRetainState（）方法不起作用。我如何排序了这一点，以prevent系统加载，将不会显示一个片段？

My Host activity has 2 panes in landscape (menuFrame and contentFrame), and only menuFrame in portrait, to which appropriate fragments are loaded. If I have something in both panes, but then change the orientation to portrait I get a NPE as it tries to load views in the fragment which would be in the (non-existent) contentFrame. Using the setRetainState() method in the content fragment didn't work. How can I sort this out to prevent the system loading a fragment that won't be shown?

非常感谢！

推荐答案

看来， onCreateViewMethod 是造成问题;它必须返回null如果容器是空：

It seems that the onCreateViewMethod was causing issues; it must return null if the container is null:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {   
    if (container == null) // must put this in
        return null;
    return inflater.inflate(R.layout.<layout>, container, false);
}

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