How to add and remove layout behavior programmatically to LinearLayout

Question

You can add the app:layout_behavior="@string/appbar_scrolling_view_behavior" behavior to a LinearLayout in the XML declaration but I haven't found a way to do the same in code. With a CoordinatorLayout you can call CoordinatorLayout.LayoutParams.setBehavior() but this method isn't available on LinearLayout.LayoutParams. Is there a way to do something similar for LinearLayout?

Grime

https://mcmap.net/q/385746/-setting-app-layout_behavior-programmatically – Nocuous

@Akeshwar that doesn't work on LinearLayout because its LinearLayout.LayoutParams can't be cast to CoordinatorLayout.LayoutParams. In fact I have a comment under that same answer stating that fact. – Grime

Answer 1

You're misunderstanding LayoutParams concept a bit.

LayoutParams object is related to the enclosing ViewGroup, not to the modified ViewGroup itself.

Vulcanize

That's probably true but on CoordinatorLayout it can be done so I'm wondering if there is a way to do it on LinearLayout too. – Grime

What exactly "can be done" on CoordinatorLayout? Take a good look a the question you posted your original comment. I do not do anything on the CoordinatorLayout itself. I do something on it's child View – Vulcanize

Not in CoordinatorLayout itself but when you have a view inside of it. What I meant was that when you had a view inside one you could add and remove LayoutParams programmatically. Not that you did that on CoordinatorLayout directly. – Grime