Flutter SearchDelegate: How to remove text underline and blue line (color) below text?

Question

Regarding Flutter Search Delegate:

How to remove text underline and blue line (color) below text?

Or

to set transparent or to change color?

I don't want to change the complete Widget with new Textfields etc. because the SearchDelegate is already good or is a finished widget.

My Code is within the SearchDelegate Widget of Flutter:

  @override
  ThemeData appBarTheme(BuildContext context) {
    return ThemeData(
      dividerTheme: DividerThemeData(
        color: Colors.white,
      ),
      primaryIconTheme: IconThemeData(color: Colors.white),

      scaffoldBackgroundColor: Colors.white, // for the body color
      brightness: Brightness.dark, // to get white statusbar icons
      primaryColor: glovar.getColor(farbnr), // set background color of SearchBar
      textSelectionTheme: TextSelectionThemeData(
        cursorColor: Colors.white,
      ), // cursor color

    );
  }

Answer 1

You can add a decoration to your TextField :

                decoration: InputDecoration(
                    focusedBorder: UnderlineInputBorder(
                        borderSide:
                            BorderSide(color: Color(0xFFE6C58C))), // your color

Answer 2

what about this solution for the white line: "decorationThickness: 0.0000001,"

  @override
  ThemeData appBarTheme(BuildContext context) {
    return ThemeData(
      dividerTheme: DividerThemeData(
        color: Colors.white,
      ),
      primaryIconTheme: IconThemeData(color: Colors.white),

      inputDecorationTheme: InputDecorationTheme(
        focusedBorder: UnderlineInputBorder(borderSide: BorderSide(color: Colors.red)),
      ),
      accentColor: Colors.white, // for the green line
      scaffoldBackgroundColor: Colors.white, // for the body color
      brightness: Brightness.dark, // to get white statusbar icons
      primaryColor: glovar.getColor(farbnr), // set background color of SearchBar
      textSelectionTheme: TextSelectionThemeData(
        cursorColor: Colors.white,
      ), // cursor color
      textTheme: TextTheme(
        headline6: TextStyle(
          //decoration:TextDecoration.none,
          decorationThickness: 0.0000001,
          //decorationColor: Colors.transparent, // color of text underline
        ),
      ),
    );
  }