为 RaisedButton 调用 ListView

Question

我的 Flutter 代码有问题。 我想将 ListView _aAntwort() 作为 RaisedButton 中的文本调用。 在模拟中显示错误：“堆栈溢出”。 谁能帮帮我？

感谢您的大力支持:)

                    RaisedButton(                              //StatefulWidget
                    onPressed: () {},
                    child: _aAntwort(),                      //ERROR  
                    ),
                              

Widget randAnswer() {
var list = <String>['aAnswer', 'bAnswer', 'cAnswer', 'dAnswer'];

var rand = new Random();

int i = rand.nextInt(list.length);
iAnswer = list[i];

list.removeAt(i);

int ii = rand.nextInt(list.length);
iiAnswer = list[ii];

list.removeAt(ii);

int iii = rand.nextInt(list.length);
iiiAnswer = list[iii];

list.removeAt(iii);

int iiii = rand.nextInt(list.length);
iiiiAnswer = list[iiii];

list.removeAt(iiii);

return randAnswer();  }


 ListView _aAntwort() {
if (iAnswer == "aAnswer") {
  return aAnswer();
} else if (iAnswer == "bAnswer") {
  return bAnswer();
} else if (iAnswer == "cAnswer") {
  return cAnswer();
} else if (iAnswer == "dAnswer") {
  return dAnswer();
}
return _aAntwort();  }                                    // I want to call this one


ListView aAnswer() {
return ListView.builder(
   {.....
   

Answer 1

在 _aAntwort() 中，您默认返回 _aAntwort()。这将导致无休止的递归调用。您需要返回类似 aAnswer 或 noAnswer 的内容

ListView _aAntwort() {
  if (iAnswer == "aAnswer") {
    return aAnswer();}
  else if (iAnswer == "bAnswer") {
    return bAnswer();} 
  else if (iAnswer == "cAnswer") {
    return cAnswer();} 
  else if (iAnswer == "dAnswer") {
    return dAnswer();}
  return _noAnswer();  
}