改变文本颜色 onTap, Flutter

Question

我是一名刚接触 Flutter 的 android 开发人员，我正在尝试创建 3 个灰色文本小部件，当用户单击一个时，单击的一个变为蓝色，而其他的保持灰色。这是我目前拥有的代码

Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: const <Widget>[

                  InkWell(
                    child: Text('Click 3',
                        style: TextStyle(
                          color: Colors.indigo,
                          fontSize: 15.0,
                          fontWeight: FontWeight.bold,
                        )),
                    onTap: () => Colors.blue,
                  ),




                  InkWell(
                    child: Text('Click 2',
                        style: TextStyle(
                          color: Colors.indigo,
                          fontSize: 15.0,
                          fontWeight: FontWeight.bold,
                        )),
                    onTap: () => Colors.blue,
                  ),


                  InkWell(
                    child: Text('Click 3',
                        style: TextStyle(
                          color: Colors.indigo,
                          fontSize: 15.0,
                          fontWeight: FontWeight.bold,
                        )),
                    onTap: () => Colors.blue,
                  ),
                ],
              ),

无论我在 onTap() 中输入什么，我都会收到错误提示

invalid constant value

Answer 1

您应该为每个按钮的颜色创建三个单独的变量，然后删除 Row 中的 const 关键字，

Color firstColor = Colors.indigo;
Color secondColor = Colors.indigo;
Color thirdColor = Colors.indigo;
...
Row(
  mainAxisAlignment: MainAxisAlignment.spaceAround,
  children: <Widget>[  /// remove const keyword
    InkWell(
      child: Text('Click 3',
        style: TextStyle(
          color: firstColor,
          fontSize: 15.0,
          fontWeight: FontWeight.bold,
        ),
      ),
      onTap: (){
        setState((){
          firstColor=Colors.blue;
        });
      },
    ),
    InkWell(
      child: Text('Click 2',
        style: TextStyle(
          color: secondColor,
          fontSize: 15.0,
          fontWeight: FontWeight.bold,
        ),
      ),
      onTap: (){
        setState((){
          secondColor=Colors.blue;
        });
      },
    ),
    InkWell(
      child: Text('Click 3',
        style: TextStyle(
        color: thirdButton,
        fontSize: 15.0,
        fontWeight: FontWeight.bold,
        ),
      ),
      onTap: (){
        setState((){
          thirdColor=Colors.blue;
        });
      },
    ),
  ],
),