question：'package:flutter/src/widegets/text.dart':failed assertion:line 235 pos 15 : 'data ! = NULL ' : is not true code： #31785

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1. sarahalramly commented on Apr 29, 2019

   

   sarahalramly

   on Apr 29, 2019

   Author

   More actions

   import 'package:flutter/material.dart';
   import 'dart:async';
   import 'package:http/http.dart' as http;
   import 'dart:convert';

   void main() => runApp(MyApp());

   class MyApp extends StatelessWidget {
   @OverRide
   Widget build(BuildContext context) {
   return MaterialApp(
   title: "الواجهه الرئيسية",
   debugShowCheckedModeBanner: false,
   theme: new ThemeData(
   primarySwatch: Colors.green[700]
   ),
   home: new MyhomePage(title: 'الاسئلة'),
   );
   }
   }
   class MyhomePage extends StatefulWidget {
   MyhomePage({Key key , this.title}):super(key:key);
   final String title;
   @OverRide
   _MyhomePageState createState()=> _MyhomePageState();

   }
   class _MyhomePageState extends State {
   var stringData = "";
   Future <List> _getQu() async{
   var data= await http.get("http://www.json-generator.com/api/json/get/cfwZmvEBbc?indent=2");
   var jsonData =json.decode(data.body);

   stringData =jsonData;
   

   List qu =[];
   for(var u in jsonData){
   Qu qur = Qu(u["questions"],u["ansar"]);
   qu.add(qur);
   }
   print(qu.length);
   return qu;

   }
   @override
   

   Widget build(BuildContext context){
   return new Scaffold(
   appBar: new AppBar(
   title: new Text(widget.title),
   ),
   body: Container(
   child: FutureBuilder(
   future: _getQu(),
   builder: (BuildContext context, AsyncSnapshot snapshot){

            if (stringData == null){
              return Container(
            child: Center(
               child: Text(" تحميل البينات........" ,  textDirection: TextDirection.rtl,),
             ),
              );
           } else{
            return ListView.builder(
              itemCount: snapshot.data.length,
              itemBuilder: (BuildContext context, int index){
                return ListTile(
               
                title: Text(snapshot.data[index].questions),
                );
              },
            ); 
           }
          },
        ),
      ),
    );
   

   }

   }
   class Qu {
   final String questions;
   final bool ansar;
   Qu(this.questions, this.ansar);

   }
2. baderouaich commented on Apr 29, 2019

   

   baderouaich

   on Apr 29, 2019

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   FutureBuilder<List> ( future: _getBookList(), builder: (context, snapshot) { if (snapshot.hasData) { return ListView.builder( itemCount: snapshot.data.length, itemBuilder: (BuildContext context, int index){ return ListTile( title: Text(snapshot.data[index].questions), ); }, ); } else if (snapshot.hasError) { return Text("${snapshot.error}"); } // By default, show a loading spinner return CircularProgressIndicator(); }, )
3. BondarenkoStas commented on Oct 16, 2019

   

   BondarenkoStas

   on Oct 16, 2019

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   This is a question better suited for StackOverflow, since there doesn’t seem to be anything wrong with Flutter itself. Closing, as this is not an issue report. See https://flutter.dev/community for support options.
4. BondarenkoStas

   closed this as completedon Oct 16, 2019
5. github-actions commented on Aug 26, 2021

   

   github-actionsbot

   on Aug 26, 2021

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   This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.
6. github-actions

   locked as resolved and limited conversation to collaborators on Aug 26, 2021