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Not Change My Container Color With Method Setstate In GestureDetector

im going to change colors Container when click on GestureDetector but nothing change... . like this image:and im click on vector men and women.. and nothing change...i use linear gradiant and List of color please help me to solve this problem

my app

import 'package:flutter/material.dart';
import 'icon_content.dart';
import 'reusable_card.dart';

const BottomContainerHeight = 80.0;

List<Color> inactiveCardColoursFemale = [Color(0xFF42A5F5), Color(0xFF039BE5)];
List<Color> activeCardColoursFemale = [Color(0xFF303F9F), Color(0xFF283593)];
List<Color> inactiveCardColoursMale = [Color(0xFFFBC02D), Color(0xFFFFB300)];
List<Color> activeCardColoursMale = [Color(0xFFFF6F00), Color(0xFFE65100)];
       enum Gender {
              male,
           female,
                    }

 class InputPage extends StatefulWidget {
    const InputPage({Key? key}) : super(key: key);

     @override
     _InputPageState createState() => _InputPageState();
        }

        class _InputPageState extends State<InputPage> {
          Gender selectedGender=Gender.female;

        @override
        Widget build(BuildContext context) {
          return Scaffold(
              appBar: AppBar(
               backgroundColor: Colors.deepOrangeAccent,
           title: const Text("Iman Bmi"),
      centerTitle: true,
    ),
    body: Column(
      children: [
        Expanded(
            child: Expanded(
          child: Row(
            children: [
              Expanded(
                child: GestureDetector(
                  onTap: () {
                    setState(() {
                      selectedGender = Gender.female;
                    });
                  },
                  child: ReusableCard(
                    colour: selectedGender == Gender.female
                        ? inactiveCardColoursFemale
                        : activeCardColoursFemale,
                    cardChild: IconContent(
                      svgPicture: 'assets/2.svg',
                      label: 'women',
                    ),
                  ),
                ),
              ),
              Expanded(
                child: GestureDetector(
                  onTap: () {
                    setState(() {
                      selectedGender = Gender.male;
                    });
                  },
                  child: ReusableCard(
                      colour: selectedGender == Gender.male
                          ? activeCardColoursMale
                          : inactiveCardColoursMale,
                      cardChild: IconContent(
                        svgPicture: 'assets/3.svg',
                        label: 'men',
                      )),
                ),
              ),
            ],
          ),
        )),
        Expanded(
          child: ReusableCard(
            colour: [Colors.deepPurple, Colors.purple],
            //colour: Color(0xFF65E655),
            cardChild: Row(
              children: [],
            ),
          ),
        ),
        Expanded(
            child: Row(
          children: [
            Expanded(
              child: ReusableCard(
                colour: [Colors.teal, Colors.tealAccent],
                //colour: Color(0xFF65E655),
                cardChild: Column(
                  children: [],
                ),
              ),
            ),
            Expanded(
              child: ReusableCard(
                colour: [Colors.amber, Colors.yellow],
                //colour: Color(0xFF65E655),
                cardChild: Column(
                  children: [],
                ),
              ),
            ),
          ],
        )),
        Container(
          margin: EdgeInsets.only(top: 20.0),
          width: double.infinity,
          height: BottomContainerHeight,
          decoration: BoxDecoration(
              gradient: LinearGradient(
                  begin: Alignment.topRight,
                  end: Alignment.bottomLeft,
                  colors: [Colors.deepOrange, Colors.deepOrangeAccent]),
              borderRadius: BorderRadius.circular(10.0)),
        ),
      ],
    ));

} }

and My ReusableCard Class Code: i use to linear gradiant and List of color

import 'package:flutter/material.dart';

class ReusableCard extends StatelessWidget {
ReusableCard({required this.colour, required this.cardChild});

//required this.colour
final List<Color> colour;
 final Widget cardChild;

 @override
Widget build(BuildContext context) {
return Container(
  child: cardChild,
  margin: EdgeInsets.all(10.0),
  decoration: BoxDecoration(
      //color: colour,
      gradient: LinearGradient(
        begin: Alignment.topRight,
        end: Alignment.bottomLeft,
        colors: colour,
      ),
      //Color(0xFF65E655)
      borderRadius: BorderRadius.circular(10.0)),
);

} }

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Answer

Removing the first Expanded widget inside your Column should fix your issue.

// Change this
Column(children: [Expanded(child: Expanded(child: Row()))])

// to this
Column(children: [Expanded(child: Row())])
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source: stackoverflow.com
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