NavigationView findViewById can't find header view

在最新的android support library, (23.1.0)中，NavigationView中的headerlayout里，view不能找到，返回的是null，但是在这版本之前确实可以的，在google+上找到了原因：

Ian Lake

2015年10月16日

  1

 

Follow along on  https://code.google.com/p/android/issues/detail?id=190226 - NavigationView moved to a RecyclerView based approach, meaning the header is now added as one type of row in the Adapter. That also means that it isn't immediately available in the view hierarchy.

所以，变通的方案有：

View headerView = navigationView.inflateHeaderView(R.layout.navigation_header);
headerView.findViewById(R.id.navigation_header_text);

链接：

https://code.google.com/p/android/issues/detail?id=190226 点击打开链接