requireViewById
open fun <T : View?> requireViewById(@NonNull window: @NonNull Window, @IdRes id: Int): @NonNull T(source)
Finds a view that was identified by the android:id XML attribute that was processed in onCreate, or throws an IllegalArgumentException if the ID is invalid, or there is no matching view in the hierarchy.
Note: In most cases -- depending on compiler support -- the resulting view is automatically cast to the target class type. If the target class type is unconstrained, an explicit cast may be necessary.
Return
a view with given ID
Parameters
window
window in which to find the view.
id
the ID to search for