CODEWITHSUNDEEP
jsondartflutter
Daniel
Daniel

Reputation: 31

Flutter - error no such file or directory when reading JSON file

Hi so I am trying to convert JSON to objects but when I read the file it throws up an exception:

FileSystemException: Cannot open file, path = 'D:/AndroidStudio/my_app/assets/data/questions.json' (OS Error: No such file or directory, errno = 2)

here is the code:

String loadQuestionAsset() {
  String jsonString;
  new File('D:/AndroidStudio/my_app/assets/data/questions.json').readAsString().then((String contents) {
    jsonString = contents;
  });
  return jsonString;
}
List<Question> parseJsonForQuestion() {
  Map decoded = jsonDecode(loadQuestionAsset());
  List<Question> questions = new List<Question>();
  for (var question in decoded['questions']) {
    questions.add(new Question(question['question'], question['bool']));
  }
  return questions;
}

and the JSON file:

{
  "questions": [
    {
      "question": "Elon Musk is human",
      "bool": false
    },
    {
      "question": "Pizza is healthy",
      "bool": false
    },
    {
      "question": "Flutter is awesome",
      "bool": true
    }
  ]
}

Thanks for help :)

Upvotes: 3

Views: 6408

Answers (2)

Valentine Knights
Valentine Knights

Reputation: 1

You can do: 

String loadQuestionAsset() {
  String jsonString;
  File('D:/AndroidStudio/my_app/assets/data/questions.json').create().readAsString().then(String contents) {
    jsonString = contents;
  });
  return jsonString;
}

Upvotes: 0

Marcin Szałek
Marcin Szałek

Reputation: 5069

Path you need to provide is: assets/data/questions.json.

Now, in order to read it, you have to add this also into assets in pubspec.yaml file.

flutter:
  assets:
    - data/questions.json

Then, in order to read, you should use rootBundle:

Map map = await rootBundle
  .loadStructuredData('assets/data/questions.json', (String s) async {
     return json.decode(s);
  });

I hope it works :)

Upvotes: 1

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