CODEWITHSUNDEEP
androidandroid-layoutandroid-coordinatorlayoutcoordinator-layout
AndreiBogdan
AndreiBogdan

Reputation: 11184

Trigger AppBar back to its normal position inside CoordinatorLayout

I have the next layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.CoordinatorLayout
            android:id="@+id/layout_offer_detail_coordinator"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar_offer_details"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_scrollFlags="scroll|enterAlways|snap" />

        </android.support.design.widget.AppBarLayout>

        <android.support.v4.widget.NestedScrollView
            android:id="@+id/layout_offer_detail_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorBackground"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

        </>
    </>
</>

This will hide the app bar when the user scrolls down in the list and will show it when the user scrolls up.

My problem is that at the end of the NestedScrollView I have a "Back to top" button, which when clicked will trigger the scrollView to scroll back up top: scrollView.smoothScrollTo(0, 0);

The issue is that the appBar does not come back down as when the user would scroll to the top. I am unable to trigger the app bar back down programatically.

Any ideas ?!

EDIT

The functionality was taken from here: see link

Upvotes: 2

Views: 422

Answers (2)

AndreiBogdan
AndreiBogdan

Reputation: 11184

It was easier than I thought. After three hours of searching and trying out things, I just had to do this:

appBarLayout.setExpanded(true, true);

Well, that was an unnecessary waste of time on my part...

Upvotes: 2

Poyyamozhi Ramakrishnan
Poyyamozhi Ramakrishnan

Reputation: 908

you have to use collapsing tool bar to achieve this. 

<android.support.design.widget.CollapsingToolbarLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:contentScrim="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

        <android.support.v7.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin"/>

    </android.support.design.widget.CollapsingToolbarLayout>

Upvotes: 0

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