Dynamically change height of BottomSheetBehavior

Question

I'm using the BottomSheetBehavior from Google recently released AppCompat v23.2. The height of my bottom sheet depends on the content displayed inside of the bottom sheet (similar to the what Google does themselves in their Maps app).

It works fine with the data loaded initially, but my application changes the content displayed during runtime and when this happens the bottom sheet retains at it's old height, which either leads to unused space at the bottom or a cut of view.

Is there any way to inform the bottom sheet layout to recalculate the height used for expanded state (when height of the ViewGroup is set to MATCH_HEIGHT) or any way to manually set the required height?

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EDIT: I also tried to manually call invalidate() on the ViewGroup and the parent of it but without any success.

Answer 1

Below code snippet helped me solve this issue where i am toggling between visibility of different views in layout and height is automatically changing for my bottom sheet.

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    return inflater.inflate(R.layout.your_bottom_sheet_layout, container, false)
}

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    val dialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
    dialog.setContentView(R.layout.your_bottom_sheet_layout)

    dialog.setOnShowListener {
        val castDialog = it as BottomSheetDialog
        val bottomSheet = castDialog.findViewById<View?>(R.id.design_bottom_sheet)
        val behavior = BottomSheetBehavior.from(bottomSheet)
        behavior.state = BottomSheetBehavior.STATE_EXPANDED
        behavior.setBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
            override fun onStateChanged(bottomSheet: View, newState: Int) {
                if (newState == BottomSheetBehavior.STATE_DRAGGING) {
                    behavior.state = BottomSheetBehavior.STATE_EXPANDED
                }
            }

            override fun onSlide(bottomSheet: View, slideOffset: Float) {}
        })
    }

    return dialog
}

Answer 2

I was facing the same issue when I used a recyclerview inside a BottomSheet and the items changed dynamically. As @sosite has mentioned in his comment, the issue is logged and they have fixed it in the latest release. Issue log here

Just update your design support library to version 24.0.0 and check.