Widget _bottomBar() => BottomNavigationBar(
        items: [
          BottomNavigationBarItem(
              icon: Icon(Icons.home),
              title: Text(
                "Home",
                style: TextStyle(fontSize: 20),
              )),
          BottomNavigationBarItem(
              icon: Icon(Icons.linked_camera),
              title: Text(
                "Capture",
                style: TextStyle(fontSize: 20),
              )),
        ],
        onTap: (index) {
          setState(() {
            _index = index;
          });
        },
        currentIndex: _index,
        fixedColor: RED,
        iconSize: 40,
      );