How to set app:layout_scrollFlags for Toolbar programmatically

android android-fragments android-toolbar android-coordinatorlayout
Hoang Ha picture Hoang Ha · Jun 11, 2015 · Viewed 32.3k times · Source

My app have a viewpager and 4 tabs, each tab have many fragment. But I just want my Toolbar scroll up/down while scrolling recyclerview in 2 specific tabs. But I don't know how to block Toolbar scroll for other tabs. I tried to import toolbar for each fragment but it seems I can't do it. Anyone have idea to solve this problem?

Answer

ianhanniballake picture ianhanniballake · Jun 11, 2015

I'd strongly recommend against changing the scrolling flags based on what tab is selected - having the Toolbar automatically return (and the content move down) when scrolling to a non-recyclerview tab can be very jarring and probably not an interaction pattern you want (exasperated if your two RecyclerView tabs are next to one another).

However, if you want to see it in person, you can use setScrollFlags() to set the scroll flags programmatically:

Toolbar toolbar = ... // your toolbar within an AppBarLayout
AppBarLayout.LayoutParams params = 
    (AppBarLayout.LayoutParams) toolbar.getLayoutParams();
params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
    | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);

In order to clear flags 

params.setScrollFlags(0)

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