BottomSheetDialogFragment – How to set expanded height (or min top offset)

The height is being wrapped because the inflated view is added to the FrameLayout which has layout_height=wrap_content. See FrameLayout (R.id.design_bottom_sheet) at https://github.com/dandar3/android-support-design/blob/master/res/layout/design_bottom_sheet_dialog.xml.

The class below makes the bottom sheet full screen, background transparent, and fully expanded to the top.

public class FullScreenBottomSheetDialogFragment extends BottomSheetDialogFragment {


    @CallSuper
    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        ButterKnife.bind(this, view);
    }


    @Override
    public void onStart() {
        super.onStart();
        Dialog dialog = getDialog();

        if (dialog != null) {
            View bottomSheet = dialog.findViewById(R.id.design_bottom_sheet);
            bottomSheet.getLayoutParams().height = ViewGroup.LayoutParams.MATCH_PARENT;
        }
        View view = getView();
        view.post(() -> {
            View parent = (View) view.getParent();
            CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) (parent).getLayoutParams();
            CoordinatorLayout.Behavior behavior = params.getBehavior();
            BottomSheetBehavior bottomSheetBehavior = (BottomSheetBehavior) behavior;
            bottomSheetBehavior.setPeekHeight(view.getMeasuredHeight());
            ((View)bottomSheet.getParent()).setBackgroundColor(Color.TRANSPARENT)

        });
    }

}

— EDIT Aug 30, 2018 —
I realized a year later that the background was colored on the wrong view. This dragged the background along with the content while a user was dragging the dialog.
I fixed it so that the parent view of the bottom sheet is colored.