Persistant Bottom Sheet Android - android

This is my code,
View bottomSheet = findViewById( R.id.bottom_sheet );
mBottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
mBottomSheetBehavior.setPeekHeight(100);
mBottomSheetBehavior.setPeekHeight(100);
mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
Is it possible to add overlay to background for Persistent Bottom sheet, when the Persistent bottom sheet is expanded?


If you want overlay bottom sheet, you can use bottom sheet dialog instead. With persistent bottom sheet, user can continue to work with main section of the screen. Where as with bottom sheet dialog, user can't work on the main section of the screen while dialog is on.

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I have created a custom progress bar and I have added it to the window decorview's root view. However, when a bottom sheet is visible, this progress bar is drawn behind the bottom sheet rather than drawing on top of it. Shouldn't it be drawn on top of the bottom sheet?
val loader = FullScreenLoader(
requireContext(),
containerView = requireActivity().window.decorView.rootView as ViewGroup
)
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Shouldn't it be drawn on top of the bottom sheet?
It behaves as expected as the progress bar is attached to the activity's window, not to the bottom sheet window.
Bottom sheets behave like dialogs (actually there are versions of them that extend Dialogs like BottomSheetDialog & BottomSheetDialogFragment. Like dialogs, if we tap outside the Bottom Sheet, it is dismissed just. there are also slide up and slide down to activate and deactivate the Bottom Sheet respectively.
If you want that progress bar overlay on top of the BottomSheet, you need to attach it to the BottomSheet dialog window instead of the activity's window.

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To my surprise Im struggling to achieve similar effect - tried applying different scroll flags (app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed") however Im getting opposite results - toolbar is visible when sheet is half extended and disappars when I scroll the sheet to the top.

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I need to implement this UI.
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