CODEWITHSUNDEEP
javaandroid
Ahmad Sattout
Ahmad Sattout

Reputation: 2476

Half expanded Collapsing toolbar

How can I create a half-expanded toolbar? Something like that WhatsApp profile page.

I've tried scrollBy and scrollTo, but they don't seem to work.

Even dispatchNestedScroll, onNesterScroll and onNestedPreScroll don't seem to work.

Upvotes: 2

Views: 606

Answers (2)

flauschtrud
flauschtrud

Reputation: 918

I managed to solve this problem by adapting this answer: https://stackoverflow.com/a/34920495/5369519 and using the following code:

nestedScrollView.post(() -> {
        int appBarHeight = appBar.getHeight()/2;
        nestedScrollView.startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
        nestedScrollView.dispatchNestedPreScroll(0, appBarHeight, null, null);
        nestedScrollView.dispatchNestedScroll(0, 0, 0, 0, new int[]{0, -appBarHeight});
    });

This simulates scrolling halfway down. Just using NestedScrollView.scrollTo() is not enough to trigger the scroll events for the parent.

Upvotes: 2

Ajeet Yadav
Ajeet Yadav

Reputation: 691

To create the collapsing toolbar, CollapsingToolbarLayout integrates with AppBarLayout, CoordinatorLayout, Toolbar, and a scrollable content view, such as RecyclerView

Upvotes: -1

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