构建行并根据我拥有的特定列表中的值用不同的图标填充行时,出现此错误(the actual error on running in emulator的图像)。 这是代码的一部分: (请注意,在两种情况下我都将返回一些小部件!)
new Container(
padding: new EdgeInsets.fromLTRB(0.0, 19.0, 0.0, 19.0),
child: new Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children:
(ballwiseDetails.length==0)?(List<Widget>.generate(6,(index) {
setState(() {
return new Icon(Icons.add);
});
})):
List<Widget>.generate(ballwiseDetails.length,(index) {
setState(() {
(index >= (6 * (overNumber - 1)))
? (getIcon(ballwiseDetails[index].ball["TypeOfBall"])):null;
});
})
))
getIcon方法:-
Container getIcon(case_Each_Ball ib) {
String text = "O";
switch (ib) {
case case_Each_Ball.dot:
text = "O";
break;
case case_Each_Ball.Singles:
text = "1";
break;
case case_Each_Ball.Doubles:
text = "2";
break;
case case_Each_Ball.Triples:
text = "3";
break;
case case_Each_Ball.Four:
text = "4";
break;
case case_Each_Ball.Six:
text = "6";
break;
case case_Each_Ball.WD:
text = "WD";
break;
case case_Each_Ball.WD4:
text = "4WD";
break;
case case_Each_Ball.Five:
text = "5";
break;
case case_Each_Ball.OUT:
text = "OUT";
break;
case case_Each_Ball.NB:
text = "NB";
break;
default:
}
return new Container(
decoration: new BoxDecoration(
shape: BoxShape.circle,
color: (ib == case_Each_Ball.OUT)
? Colors.red[800]
: Colors.yellow[800]),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: new Text(text),
),
);
}
答案 0 :(得分:0)
使您的最后一个Low
条件不返回select[id=incident.urgency] option[value=1] + option
,而是返回一个空的else
。
null