如何让Android BottomSheetDialogFragment出现在系统/手势栏后面？

<style name="TransparentBottomSheetDialogTheme" parent="Theme.Design.Light.BottomSheetDialog">
    <item name="android:windowBackground">@android:color/transparent</item>
</style>

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    return inflater.inflate(R.layout.fragment_bottom_sheet_dialog, container, false);
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    Window window = getDialog().getWindow();
    if (window != null) {
        window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
    }
}