我正在开发一个应用程序，在该应用程序中我需要解析json，然后逐个显示一个问题。在问题下方，我有一个按钮next，它将列表视图跳至下一个位置并显示下一个问题。
{
"error": false,
"response": [
{
"ques_id": 5,
"quiz_questions": "Does your friend constantly have to account for there whereabouts?",
"option_1": "Yes",
"option_2": "No"
},
{
"ques_id": 6,
"quiz_questions": "Does your friend constantly have to account for there whereabouts?",
"option_1": "Yes",
"option_2": "No"
},
{
"ques_id": 7,
"quiz_questions": "Does your friend constantly have to account for there whereabouts?",
"option_1": "Yes",
"option_2": "No"
},
{
"ques_id": 8,
"quiz_questions": "sdfsdfsdfsdfsdfsdfsdf",
"option_1": "Yes",
"option_2": "No"
}
]
}
我需要解析json之上。 现在，这是我的列表视图颤动代码。
child: ListView.builder(
itemCount: question_list.length,
physics: const NeverScrollableScrollPhysics(),
scrollDirection: Axis.horizontal,
shrinkWrap: true,
controller: _scrollController,
itemBuilder:(context, position){
return Container(
width:MediaQuery.of(context).size.width * 1,
height: MediaQuery.of(context).size.height *0.9,
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.all(10),
padding: EdgeInsets.all(20),
child:Text(question_list[position].quiz_question,
style: TextStyle(fontSize: 18.0,color: Colors.white),),
),
Column(
children: <Widget>[
Row(
children: <Widget>[
Radio(
value:1,
groupValue: _radioValue,
onChanged: _handleRadioValueChange,
activeColor: Colors.blue,
),
Container(
margin: EdgeInsets.all(10),
child:Text(question_list[position].option_1,
style: TextStyle(fontSize: 18.0,color: Colors.white),),
),
],
),
Row(
children: <Widget>[
Radio(
value: 0,
groupValue: _radioValue,
onChanged: _handleRadioValueChange,
activeColor: Colors.blue,
),
Container(
margin: EdgeInsets.all(10),
child:Text(question_list[position].option_2,
style: TextStyle(fontSize: 18.0,color: Colors.white),),
),
],
),
],
),
ButtonTheme(
minWidth: 300.0,
child:new RaisedButton(
// padding: const EdgeInsets.fromLTRB(15.0,5.0, 15.0, 5.0),
color: Color(0xFFD0D0DA),
elevation: 4.0,
disabledColor: Color(0xFFD0D0DA),
// splashColor: Colors.blue,
child: new Text(position == question_list.length-1 ?"SUBMIT" :"NEXT"
,style: TextStyle(color: Colors.black,fontSize: 16.0),),
onPressed: () {
cat_para = cat_para + "1"+",";
sub_cat_para = sub_cat_para + "1"+",";
ques_id_para = ques_id_para +question_list[position].ques_id.toString()+",";
answer_para = answer_para + _radioValue.toString() + ",";
cat.add(1);
sub_cat.add(1);
ques_id.add(question_list[position].ques_id);
// ques_ans.add(_radioValue);
var t =[1.toString(),1.toString(),question_list[position].ques_id.toString(),_radioValue.toString()];
_final.add(t);
;
//print(position);
if(position == question_list.length-1){
submit();
print("SUBMitting");
}
else{
_scrollController.animateTo(_scrollController.position.extentInside, duration: new Duration(seconds: 1), curve: Curves.ease);
}
},
shape: new RoundedRectangleBorder(borderRadius: new BorderRadius.circular(30.0))
),
)
],
),
);
}
),
上面的代码可以很好地工作到位置，但是那之后不问问题3的原因？我已经检查了所有事情，例如检查位置和问题总数，一切都很好，但是没有跳到第3个问题。 另外，如果我这样做
_scrollController.position.maxScrollEvent
这将是提交问题的最后一个问题，这表明我已经正确解析了json。请帮我解决这种情况。在此先感谢。