rv as bottom sheet #bottom_sheet

rvBottomSheet.kt

val behavior = from(bottomSheetRv)
            behavior.addBottomSheetCallback(object : BottomSheetCallback() {
                override fun onStateChanged(
                    @NonNull bottomSheet: View,
                    newState: Int
                ) {
                    if (newState == STATE_EXPANDED) {
                        // In the EXPANDED STATE apply a new MaterialShapeDrawable with rounded cornes
                        val newMaterialShapeDrawable: MaterialShapeDrawable = createMaterialShapeDrawable(bottomSheetRv)
                        ViewCompat.setBackground(
                            bottomSheet,
                            newMaterialShapeDrawable
                        )
                    }
                }

                override fun onSlide(
                    @NonNull bottomSheet: View,
                    slideOffset: Float
                ) {
                }
            })
//  behavior.state = STATE_COLLAPSED / STATE_EXPANDED
 private fun createMaterialShapeDrawable(bottomSheet: View): MaterialShapeDrawable {
        val currentMaterialShapeDrawable =
            bottomSheet.background as MaterialShapeDrawable
        val shapeAppearanceModel = ShapeAppearanceModel()
            .toBuilder()
            .setAllCorners(
                CornerFamily.ROUNDED,
                dpToPx(16f)
            )
            .build()
        val newMaterialShapeDrawable =
            MaterialShapeDrawable(shapeAppearanceModel)

        // Copy the attributes in the new MaterialShapeDrawable
        newMaterialShapeDrawable.initializeElevationOverlay(context)
        newMaterialShapeDrawable.fillColor = currentMaterialShapeDrawable.fillColor
        newMaterialShapeDrawable.tintList = currentMaterialShapeDrawable.tintList
        newMaterialShapeDrawable.elevation = currentMaterialShapeDrawable.elevation
        newMaterialShapeDrawable.strokeWidth = currentMaterialShapeDrawable.strokeWidth
        newMaterialShapeDrawable.strokeColor = currentMaterialShapeDrawable.strokeColor
        return newMaterialShapeDrawable
    }

rvBottomSheet.xml

  <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/bottomSheetRv"
        style="@style/CustomBottomSheetDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:overScrollMode="never"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior" />

styles.xml

 <style name="CustomBottomSheetDialog" parent="@style/ThemeOverlay.MaterialComponents.BottomSheetDialog">
        <item name="behavior_peekHeight">96dp</item>
        <item name="behavior_hideable">false</item>
        <item name="android:elevation">8dp</item>
        <item name="shapeAppearance">@style/ShapeTopCornered</item>
    </style>
<style name="ShapeTopCornered">
        <item name="cornerFamily">rounded</item>
        <item name="cornerSizeTopRight">16dp</item>
        <item name="cornerSizeTopLeft">16dp</item>
        <item name="cornerSizeBottomRight">0dp</item>
        <item name="cornerSizeBottomLeft">0dp</item>
    </style>