How to call nested json data using API in flutter?

Question

My JSON looks like this:

{
Info: [
       {
         c_type_id: "1",
         cleaning type: "A Cleaning"
        },
        {
          c_type_id: "2",
          cleaning type: "B Cleaning"
         },
         {
           c_type_id: "3",
           cleaning type: "C Cleaning"
         },
         {
           c_type_id: "4",
           cleaning type: "D Cleaning"
          },
          {
            c_type_id: "5",
            cleaning type: "E Cleaning"
           },
       ]
}

and here is the code: The following code is created by this Class 1:

class Album {
   List<Info> info;
   Album({this.info})
     Album.fromJson(Map<String, dynamic> json) {
      if (json['Info'] != null) {
       info =  List<Info>.empty();
       json['Info'].forEach((v) {
       info.add(new Info.fromJson(v));
      });
     }
    }

   Map<String, dynamic> toJson() {
     final Map<String, dynamic> data = new Map<String, dynamic>();
      if (this.info != null) {
      data['Info'] = this.info.map((v) => v.toJson()).toList();
      }
     return data;
     }
    }

class 2:

class Info {
  String cTypeId;
  String cleaningType;
  Info({this.cTypeId, this.cleaningType});
    Info.fromJson(Map<String, dynamic> json) {
    cTypeId = json['c_type_id'];
    cleaningType = json['cleaning type'];
    }
   Map<String, dynamic> toJson() {
   final Map<String, dynamic> data = new Map<String, dynamic>();
   data['c_type_id'] = this.cTypeId;
   data['cleaning type'] = this.cleaningType;
   return data;
 }
}

This is the error I get when I execute the code: error: The argument type 'List' can't be assigned to the parameter type 'String'.

Hoping for help!

@Ravindra S. Patil, I tried both but I didn't get output. Now, this error is showing "error: The operator '[]' isn't defined for the type 'Album'" — parveen
– parveen, Commented Aug 9, 2021 at 8:03
can you tell me your json data is host online? because my second answer json data and your json data is look like same — Ravindra S. Patil
– Ravindra S. Patil, Commented Aug 9, 2021 at 8:28

Ravindra S. Patil · Accepted Answer · 2021-08-09 09:06:48Z

2

You should Try below code your problem has been solved ->

Declare your API Call funtion

Future<List<dynamic>> getInfoData() async {
    String url = 'https://fillmmaka.com/gigocleanapi/cleanintypes.php';
    var response = await http.get(Uri.parse(url), headers: {
      'Content-Type': 'application/json',
      'Accept': 'application/json',
    });
    return json.decode(response.body)['Info'];
  }

Declare your Widget

Center(
    child: FutureBuilder<List<dynamic>>(
      future: getInfoData(),
      builder: (context, snapshot) {
        if (snapshot.hasData) {
          return Padding(
            padding: const EdgeInsets.all(8.0),
            child: ListView.builder(
              itemCount: snapshot.data.length,
              itemBuilder: (context, index) {
                var id = snapshot.data[index]['c_type_id'];
                var type = snapshot.data[index]['cleaning type'];

                return Card(
                  shape: RoundedRectangleBorder(
                    side: BorderSide(
                      color: Colors.green.shade300,
                    ),
                    borderRadius: BorderRadius.circular(15.0),
                  ),
                  child: ListTile(
                    leading: Text(id),
                    title: Text(type),
                  ),
                );
              },
            ),
          );
        }
        return CircularProgressIndicator();
      },
    ),
  ),

Your Screen look like this ->

answered Aug 9, 2021 at 9:06

Ravindra S. Patil

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3 Comments

Kim Lo Over a year ago

hi sir ravindra. can i comment here a follow-up question related to this problem? thanks

Ravindra S. Patil Over a year ago

@KimLo Yes sure, say your problem

Kim Lo Over a year ago

what if i have a similar list, but this time it is nested. How do i make each textfield of the sublist unique? bcoz in my program now, whenever i input 55 on the textfield, it will change all the textfield on the sublist with the same index. thanks! see image link. imgur.com/IjOqWPJ

caiopo · Accepted Answer · 2021-08-09 06:38:27Z

0

What is your goal? What do you want to show on the screen? For example, do you want to show a list with all the cleaning types?

You are getting this error because the attribute info in your Album class is a List:

class Album {
   List<Info> info;

If you want to show the cleaningType of the first info on the list, you may do something like this:

return Text(snapshot.data.info[0].cleaningType);

Just keep in mind this will crash if the info list is empty.

answered Aug 9, 2021 at 6:38

caiopo

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1 Comment

parveen Over a year ago

and what if i want to show all the list data?

Asim Jawad · Accepted Answer · 2021-08-09 06:42:50Z

0

you are trying to access the whole list there just use snapshot.data.info[index].variableName you want to access and you will be good to go

edited Aug 9, 2021 at 6:42

answered Aug 9, 2021 at 6:35

Asim Jawad

1732 silver badges11 bronze badges

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