Understanding BottomSheet Behavior Collapsed vs Hidden

Question

I have a bottom sheet with its height and width set to match_parent. So when on button click I set the behavior to STATE_EXPANDED like this:

mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);

My Bottomsheet is defined as below:

    <FrameLayout
        android:id="@+id/bottom_sheet"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true"
        android:elevation="@dimen/design_appbar_elevation"
        app:behavior_hideable="true"
        app:layout_behavior="@string/bottom_sheet_behavior">

        <include
            android:id="@+id/bottom_sheet_content"
            layout="@layout/bottomsheet_layout" />

    </FrameLayout>

I am monitoring states with the BottomSheet Callbacks.

• I click on a button and bottom sheet expanded to full screen.
• Its current State is STATE_EXPANDED
• I quickly swipe down on the bottom sheet. (Not fully drag till it closed, simple swipe down like scrolling)
• It stops at the middle and its state is logged as STATE_COLLAPSED
• If I swipe again it is all gone and its state is STATE_HIDDEN

I don't understand why it stops in the middle. How can I make it hidden with a single swipe.

I tried that by setting peek_height to 0dp. By this, it never encounters the STATE_HIDDEN. When hidden, its state becomes STATE_COLLAPSED. I just don't understand this states.

How to achieve STATE_HIDDEN with a single swipe down?

Answer 1

Kinda late but I just stumbled upon this while searching for something similar.

This is how you can skip the collapsed state:

In XML by adding app:behavior_skipCollapsed="true" to the BottomSheet view.

OR

Programmatically with setSkipCollapsed(boolean).