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I want to be able to add more states to my current BottomSheet with multiple custom heights.

Right now, the AndroidX bottom sheet only has the following states: STATE_HIDDEN, STATE_HALF_EXPANDED, STATE_EXPANDED, STATE_COLLAPSED, STATE_DRAGGING, STATE_SETTLING.

Is there any way to add states/heights to the "BottomSheetBehavior" class?

Solutions I've considered:

  • There is a lot of material on this for the support version of the BottomSheet (and most of them stem from copy/pasting the code and modifying behavior) however almost none for the com.google.android.material.bottomsheet

  • I've considered extending the BottomSheetBehavior class and manually altering it's behavior however this will take a lot of work/analysis to complete

Cerulean.Source
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1 Answers1

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There are 2 ways to achive that you want.

First same solution like yours. There are a lot of examples of adding new states - like this. As you can see, they just copy class of BottomSheetBehavior and make some modification.

Why it was done like that? Because most important fields that you need to modify are internal or private. There is no way to make modification by inheritance in case with private fields. You can check this anchor behavior and watch the difference with original in material repo. If all fields that you need to modify is internal you can make a child of bottom sheet behavior and place it in same package as bottom sheet behavior - check example here (this behavior is mine and i prefer this solutions, since all fields that i need is internal. check package of this class - it has same package name as BottomSheetBehavior). In this case you can modify fields. Both solutions are ugly. There is nothing we can do with this strange api of BottomSheetBehavior

HeyAlex
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  • Yep, thanks for the answer. I went with manually altering my BottomSheetBehavior. It works fine for the most part...although the anchorage and movement is a bit weird (I don't know if that's normal but I left it as is). – Cerulean.Source Aug 14 '21 at 04:55
  • @HeyAlex maybe you know, how to apply custom bottom sheet behavior to ModalBottomSheet? – Jack The Healer Apr 24 '23 at 16:22
  • @JackTheHealer sorry for missing your comment for a long time! i suggest you to write it by yourself. where is no way to change it without any hacky variants, which can fit production code imo – HeyAlex May 11 '23 at 05:38
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    @HeyAlex i found the way. later i write solution in my own question :) – Jack The Healer May 11 '23 at 10:25