text: Q:
  
  Why can't alignment by Align widget?
  
  I need to align "Scan check" in the center of Text widget. I try widget Align but it not help.
  snippet:
   Widget _createScanCheckContainer() {
      return new Container(
          margin: const EdgeInsets.only(top: Constants.DEFAULT_MARGIN),
          height: 56.0,
          color: Color(Constants.COLOR_PRIMARY),
          child: Row(children: [
            new Align(
                alignment: Alignment.center,
                child: Text(
                  "Scan check",
                  style: TextStyle(
                      fontSize: 19.0, color: Colors.white),
                ))
          ]));
    }
  
  Here result.
  
  Why Scan check is not on the center?
  
  A:
  
  Make the row center align all its children horizontally.
  Widget _createScanCheckContainer() {
      return new Container(
          margin: const EdgeInsets.only(top: Constants.DEFAULT_MARGIN),
          height: 56.0,
          color: Color(Constants.COLOR_PRIMARY),
          child: Row(children: [
            new Align(
                alignment: Alignment.center,
                child: Text(
                  "Scan check",
                  style: TextStyle(
                      fontSize: 19.0, color: Colors.white),
                ))
          ], mainAxisAlignment: MainAxisAlignment.center));
    }
  
  