if (browns == true)与if (browns)相同，因此可以将条件存储在三个变量中，以提高可读性

final brownBlackWhites = browns && blacks && whites;
    final yellowBlack = yellows && blacks; // I think depend on your login you should add `&& browns` 
    final redYellowBlack = reds && yellows && blacks;
    Text(
      // if
      brownBlackWhites
          ? 'Proportion: $browns agutis : $blacks pretos : $whites albinos'
          :
          // else if
          yellowBlack
              ? 'Proportion: $yellows dourados : $blacks pretos : $browns chocolates'
              :
              // else if
              redYellowBlack
                  ? 'Proportion: $reds coloridos : $blacks pretos : $browns chocolates'
                  // else
                  : 'Invalid proportion',
    )

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编辑

从那一行去掉点

),].),),

型
成为

),]),),

型

编辑2

final browns = colors.where((color) => color == Colors.brown).length;
final brownBlackWhites = browns == true && blacks == true && whites == true;

型
问题是browns的类型是int，所以browns == true不能工作，因为'=='比较两个相同的类型，而在这种情况下，你比较int和boolean

我的建议是使用一个builder widget，使代码可读性和可维护性，而不与三元运算符冲突。三进制运算符很难理解和维护，如果有一个以上的条件。

Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Builder(builder: (BuildContext context) {
          String text = '';
          if (browns == true && blacks == true && whites == true) {
            text =
                'Proportion: $browns agutis : $blacks pretos : $whites albinos';
          } else if (yellows == true && yellows == true && blacks == true) {
            text =
                'Proportion: $yellows dourados : $blacks pretos : $browns chocolates';
          } else if (reds == true && yellows == true && blacks == true) {
            'Proportion: $reds coloridos : $whites brancos';
          } else {
            text = 'Invalid proportion';
          }
          return Text(
            text,
            style: TextStyle(
                fontFamily: 'courier',
                fontSize: 20.0,
                fontWeight: FontWeight.bold,
                height: 2.5,
                letterSpacing: 0.7),
          );
        })
      ],
    ),

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这是在三元运算符中使用两个或多个条件的示例

const isValue = (_value) => _value > 100 ? "Greater Than 100" : _value < 100 ? "Lower Than 100" : "Equal to 100";

console.log(isValue(120)) // Output => Greater Than 100

console.log(isValue(50)) // Output => Lower Than 100

console.log(isValue(100)) // Output => Equal to 100

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