¿ 如何读取 flutter 中的本地 json 文件？

Question

I've read many posts where someone explains how to do it, but in my case, it's not working and I'm not sure why, I've added the right folder to the pubspec.yaml and everything, this is my code

import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:flutter/services.dart';
import 'package:flutter/cupertino.dart';
import 'package:workout_time/Widgets/routines_widget.dart';

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

class WorkoutTime extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'My Great App',
      home: Scaffold(
        body: RoutinesWidget(),
      ),
    );
  }
}

class RoutinesWidget extends StatefulWidget {
  @override
  _RoutinesWidgetState createState() => _RoutinesWidgetState();
}

class _RoutinesWidgetState extends State<RoutinesWidget> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: FutureBuilder(
        future: rootBundle.loadString("assets/data.json"),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return CircularProgressIndicator();
          }
          var myData = jsonDecode(snapshot.data.toString());
          return Center(
            child: Text(myData == null ? "Nothing here" : myData),
          );
        },
      ),
    );
  }
}

when I run it, I get the CircularProgressIndicator widget, meaning that the snapshot has no data. Can anyone help me?

Edit: here is the part in the pubspec.yaml where I import the folder:

assets:
  - assets/
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg

Answer 1

Code - pubspec.yaml

assets: - assets/json/

Code - In a Class

   static Map<dynamic, dynamic> jsonData;
    loadJson() async {
      String jsonContent = await rootBundle.loadString("assets/json/data.json");
      jsonData = json.decode(jsonContent);
    }