flutter push page up when keyboard on

i want to push the page up when keyboard is on. i have next page button bottom of my page (for now its bottomnavigationbar) but when i filling fields and keyboard is on next page button stays under keyboard, i want to keyboard pushes up the bottomnavigationbar and always seen

Scaffold(
body : Center(
      child: SingleChildScrollView(
        child: Column(
          children: [
           ..mywidgets
          ],
        ),
      ),
    ),
bottomNavigationBar: nextButtonWidget()
);