最好的地方，addHeaderView在ListFragment [英] Best place to addHeaderView in ListFragment

问题描述

我有一些麻烦设置我的自定义的头在我的列表中。

I'm having some trouble setting up my custom header in my list.

我要创建一个自定义适配器ListFragment。我有一系列的精致的工作，但我试图找出其中的一个片段的生命周期来连接头。

I'm creating a ListFragment with a custom adapter. I have the list working fine, but I'm trying to figure out where in the lifecycle of a Fragment to attach the header.

我知道头已被添加之前，您设置的适配器。

I know the header has to be added before you set your adapter.

我尝试添加我的头在onActivityCreated，但被调用每一个我的片段回来从backstack时间，因为我也把我的适配器onActivityCreated，它失败。

I tried adding my header in onActivityCreated, but that gets called every time my Fragment comes back from the backstack, and since I also set my adapter in onActivityCreated, it fails.

我尝试添加它的onCreate，但视图层次结构是不是可以在生命周期的这一阶段。

I tried adding it in onCreate, but the view hierarchy isn't available at that stage of the lifecycle.

我试过onCreateView加入它，但我不能投从膨胀到ListView视图返回。所以，我可以不是我的头添加到香草查看。

I tried adding it in onCreateView, but I couldn't cast the view returned from inflate to a ListView. So I couldn't add my header to a vanilla View.

有什么想法？

推荐答案

我不知道你是否已经解决了你的问题，但这里是为我工作的一个解决方案：

I don't know if you have solved your problem but here is a solution that worked for me:

不要叫 ListFragment.setListAdapter（）在 ListFragment.onCreate（）。请确保您有一个字段变量，可以保存头来看，也许这样的：

Do not call ListFragment.setListAdapter() in your ListFragment.onCreate(). Make sure you have a field variable that can hold the header view, maybe like:

View mheaderView;

然后在你的 ListFragment.onCreateView（），抬高头查看，并将其分配给您的变量，像这样：

Then in your ListFragment.onCreateView(), inflate the header View and assign it to your variable like so:

View list_root = inflater.inflate(R.layout.fragment_list, null);
// Get the list header - to be added later in the lifecycle
// during onActivityCreated()
mheaderView = inflater.inflate(R.layout.list_header, null);
return list_root;

最后，在你的 ListFragment.onActivityCreated（）你现在可以叫 ListFragment.getListView（）。addHeaderView（）。基本上，像这样：

Finally, in your ListFragment.onActivityCreated() you can now call ListFragment.getListView().addHeaderView(). Basically something like so:

super.onActivityCreated(savedInstanceState);
if (mheaderView != null)  this.getListView().addHeaderView(headerView);
// Don't forget to now call setListAdapter()
this.setListAdapter(listAdapter);

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