Setting maximum expanded height for bottomsheet dynamically

Question

How to set maximum expanded height in android support design bottom sheet?

The question is an extension to the above question, i want to set the max expanded height of the sheet but dynamically according to the screen size.

I have tried setting new layout params to the view implementing bottomsheet behaviour but it does nothing good.

Answer 1

Please use this and chill :)

1. const val BOTTOMSHEET_HEIGHT_TO_SCREEN_HEIGHT_RATIO = 0.80 //change according to your requirement
2. override onCreateDialog() in your bottomsheetFragment

---

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val dialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
        dialog.setOnShowListener {
            dialog.findViewById<FrameLayout>(com.google.android.material.R.id.design_bottom_sheet)
                ?.apply {
                    val maxDesiredHeight =
                        (resources.displayMetrics.heightPixels * BOTTOMSHEET_HEIGHT_TO_SCREEN_HEIGHT_RATIO).toInt()
                    if (this.height > maxDesiredHeight) {
                        val bottomSheetLayoutParams = this.layoutParams
                        bottomSheetLayoutParams.height = maxDesiredHeight
                        this.layoutParams = bottomSheetLayoutParams
                    }
                    BottomSheetBehavior.from(this)?.apply {
                        this.state = BottomSheetBehavior.STATE_EXPANDED
                        this.skipCollapsed = true
                    }
                }
        }
        return dialog
    }

Answer 2

2021 I'm late but someone will need Kotlin extenxion:

fun View.setupFullHeight(maxHeight: Double = 0.3) {
val displayMetrics = context?.resources?.displayMetrics
val height = displayMetrics?.heightPixels
val maximalHeight = (height?.times(maxHeight))?.toInt()
val layoutParams = this.layoutParams
maximalHeight?.let {
    layoutParams.height = it
}
this.layoutParams = layoutParams

}

How to use:

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return object : BottomSheetDialog(requireContext(), R.style.DialogRoundedCornerStyle) {

        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)

            dialog?.setOnShowListener {
                val bottomSheetDialog = it as BottomSheetDialog
                val parentLayout =
                    bottomSheetDialog.findViewById<View>(R.id.design_bottom_sheet)
                parentLayout?.let { view ->
                    val behavior = BottomSheetBehavior.from(view)
                    view.setupFullHeight()
                    behavior.apply {
                        state = BottomSheetBehavior.STATE_EXPANDED
                        isDraggable = false
                        isCancelable = false
                    }
                }
            }
        }

        override fun onBackPressed() {
            super.onBackPressed()
            dialog?.dismiss()
        }
    }
}