kotlin get view from NavigationView header

问题

I have such variant, but I believe that there is a better way to do this

val header = nav_view.getHeaderView(0) as LinearLayout
val userName = header.findViewById(R.id.user_name) as TextView

The issue is that when I try to get it just by user_name, it is null.

回答1:

This might help you and i think that its better way .

nav_view.getHeaderView(0).userNameTxt.text

This is shortest way to access from header.

回答2:

You might consider using Android-Kotlin extension plugin. In that case your code will be much simpler and would be:

val headerView: View = nav_view.getHeaderView(0)
headerView.userNameTxt.text = "Some Value"

来源：https://stackoverflow.com/questions/47097846/kotlin-get-view-from-navigationview-header