在我NavigationView我有身份证'的ViewID活跃按钮的头布局。要设置这些按钮，我在下面做活动的 onPostCreate ：

In my NavigationView I have a header layout with id 'viewId' with active buttons. To setup those buttons, I do the following in activity's onPostCreate:

final View panel = findViewById(R.id.viewId);
panel.setOnClickListener(new View.OnClickListener() {
... setup goes here ...
});

使用新版本的Andr​​oid支持库，（ 23.1.0 ），认为无法找到，返回null。随着previous版本，效果不错。它是一个错误还是我使用这个功能了？如果是这样，如何​​访问头布局，并添加行为呢？

With new version android support library, (23.1.0), the view can't be found, it returns null. With previous versions it worked well. Is it a bug or am I using this feature wrong? If so, how to access header layout and add behavior to it?

推荐答案

版本23.1.0开关 NavigationView 来使用 RecyclerView （而不是previous 的ListView ）和报头添加作为这些元素中的一个。这意味着它不立即提供给调用 findViewById（） - 需要一个布局传递之前，它连接到 NavigationView 。

Version 23.1.0 switches NavigationView to using a RecyclerView (rather than the previous ListView) and the header is added as one of those elements. This means it is not instantly available to call findViewById() - a layout pass is needed before it is attached to the NavigationView.

有关的支持库版本23.1.1 ，你现在可以得到一个参考标题视图使用 getHeaderView（）：

For version 23.1.1 of the Support Library, you can now get a reference to the header view using getHeaderView():

View headerLayout = navigationView.getHeaderView(0); // 0-index header

这有工作通过XML，并通过code加标题的优势。

This has the advantage of working on headers added via XML and via code.

如果你还在使用23.1.0，按相关的错误，你可以在充气code头，并使用 findViewById（）上：

If you are still using 23.1.0, as per the related bug, you can inflate the header in code and use findViewById() on that:

View headerLayout = 
    navigationView.inflateHeaderView(R.layout.navigation_header);
panel = headerLayout.findViewById(R.id.viewId);
// panel won't be null

直到你移动到23.1.1。

Until you move to 23.1.1.