Can we return data from JSON into anything but ListView in flutter?

Question

I'm trying to make a page for each letter of the alphabet. I need to take the data from a JSON. So I don't have to define a class for each letter.

        Row(
          children: <Widget>[
            Expanded(
              child: Stack(
                children: <Widget>[
                  Container(
                    margin: EdgeInsets.all(sizeY / 3 - 1),
                    height: sizeY,
                    decoration: BoxDecoration(
                        image: DecorationImage(
                            image: AssetImage(
                                "assets/square-" + imgColor + "-big.png"),
                            fit: BoxFit.fitHeight)),
                    child: Padding(
                      padding: const EdgeInsets.all(15.0),
                      child: Center(
                        child: Text(
                          this.letter + this.letter.toLowerCase(),
                          style: TextStyle(
                              color: Colors.white,
                              fontSize: 40.0,
                              fontFamily: 'ConcertOne',
                              fontWeight: FontWeight.normal),
                          textAlign: TextAlign.center,
                        ),
                      ),
                    ),
                  ),
                ],
              ),
            ),
            Expanded(
              child: Text(
                this.shembulli1,
                style: TextStyle(
                    color: Colors.pink,
                    fontWeight: FontWeight.bold,
                    fontSize: 30.0),
                textAlign: TextAlign.center,
              ),
            ),
            Expanded(
                child: Container(
              width: sizeY / 2,
              height: sizeX / 2,
              decoration: BoxDecoration(
                  image: DecorationImage(
                      image: AssetImage("assets/" + shembulliImg1 + ".png"),
                      fit: BoxFit.contain)),
            ))
          ],
        ),

Where shembulli1, shembulli2, shembulliImg1, shembulliImg2, letter, and imgColor have to come from JSON which looks something like this:

    {
        "shembulli1":"Bleta",
        "shembulli2":"Biçikleta",
        "shembulliImg1":"bee",
        "shembulliImg2":"bike",
        "letter":"B",
        "imgColor":"blue"
    },
    {
        "shembulli1":"Cicërima",
        "shembulli2":"Certifikata",
        "shembulliImg1":"bird",
        "shembulliImg2":"letter",
        "letter":"C",
        "imgColor":"yellow"
    },

All flutter tutorials only show how to return the data from json in a ListView, do you have any idea/example on how I could parse the data properly in my case? — lumi
– lumi, Commented Oct 22, 2020 at 8:51

Lulupointu · Accepted Answer · 2020-10-22 15:19:33Z

Fetch JSON data to make a List. from that List you can do

yourList.forEach((post) {
    //generate widget for each element
})

void getPostsData() {
  List<dynamic> AlphabetList = AlphabetModel;

  /*    
        List defined as the JSON
        if you have a JSON in your PC then import it
        if your're fetching data from server like firebase then you've to fetch data something like this

        fetchData() {
            //'data' is the table from where your JSON is generating
            CollectionReference collectionReference = Firestore.instance.collection('data');    
            collectionReference.snapshots().listen((snapshot) {

                setState(() {
                    //this will give JSON as a List
                    AlphabetList = snapshot.documents;
                });
            });
        } 
    */


  AlphabetList.forEach((post) {
    Row(
      children: <Widget>[
        Expanded(
          child: Stack(
            children: <Widget>[
              Container(
                margin: EdgeInsets.all(sizeY / 3 - 1),
                height: sizeY,
                decoration: BoxDecoration(
                    image: DecorationImage(
                        image: AssetImage(
                            "assets/square-" + post["imgColor"] + "-big.png"),
                        fit: BoxFit.fitHeight)),
                child: Padding(
                  padding: const EdgeInsets.all(15.0),
                  child: Center(
                    child: Text(
                      post["letter"] + post["letter"].toLowerCase(),
                      style: TextStyle(
                          color: Colors.white,
                          fontSize: 40.0,
                          fontFamily: 'ConcertOne',
                          fontWeight: FontWeight.normal),
                      textAlign: TextAlign.center,
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
        Expanded(
          child: Text(
            post["shembulli1"],
            style: TextStyle(
                color: Colors.pink,
                fontWeight: FontWeight.bold,
                fontSize: 30.0),
            textAlign: TextAlign.center,
          ),
        ),
        Expanded(
            child: Container(
              width: sizeY / 2,
              height: sizeX / 2,
              decoration: BoxDecoration(
                  image: DecorationImage(
                      image: AssetImage("assets/" + post["shembulliImg1"] + ".png"),
                      fit: BoxFit.contain)),
            ))
      ],
    )
    ,
  })
}

This looks good, the json is from a local file "assets/data/alfabeti.json" , could you include the fetchData and setState for this?
youtube.com/watch?v=Cn6VCTaHB-k&t=531s In this he got a JSON and made a const List variable from it. then he saved that List in a dart file. and imported that dart file. After that just assign the const List to the AlphabetList.

Akif · Accepted Answer · 2020-10-22 08:58:21Z

You can use this model to work with.

      
class AlphabetModel {
  String shembulli1;
  String shembulli2;
  String shembulliImg1;
  String shembulliImg2;
  String letter;
  String imgColor;

  AlphabetModel(
      {this.shembulli1,
      this.shembulli2,
      this.shembulliImg1,
      this.shembulliImg2,
      this.letter,
      this.imgColor});

  AlphabetModel.fromJson(Map<String, dynamic> json) {
    shembulli1 = json['shembulli1'];
    shembulli2 = json['shembulli2'];
    shembulliImg1 = json['shembulliImg1'];
    shembulliImg2 = json['shembulliImg2'];
    letter = json['letter'];
    imgColor = json['imgColor'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['shembulli1'] = this.shembulli1;
    data['shembulli2'] = this.shembulli2;
    data['shembulliImg1'] = this.shembulliImg1;
    data['shembulliImg2'] = this.shembulliImg2;
    data['letter'] = this.letter;
    data['imgColor'] = this.imgColor;
    return data;
  }
}

Now it becomes easier to define a serialized list from your JSON. After that, you can build a simple ListView. Look here.

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