如何在Flutter Mobile App中加载和查询本地json数据 [英] How can I to load and query local json data in Flutter Mobile App

问题描述

这是我的 key:value 配对本地json.我需要加载，以后再用于查询. 那么，如何在Flutter Mobile App中加载和查询本地json数据?

Here is my key:value paired local json. I need to load and later I need to use for query. So, how can I to load and query local json data in Flutter Mobile App?

{
  "currency.01": "United State USD",
  "currency.17": "British Pound GBP",
  "currency.33": "Euro EUR",
}

推荐答案

将JSON文件添加到pubspec.yaml

add your JSON file to the pubspec.yaml

  assets:
    - assets/config.json

，然后您可以使用rootBundle加载

import 'dart:async' show Future;
import 'package:flutter/services.dart' show rootBundle;

Future<String> loadAsset() async {
  return await rootBundle.loadString('assets/config.json');
}

还请看这个完整示例 然后将JSON数据转换为 LIST 有很多搜索方法，例如 where 方法

also take a look at this full example and for querying convert your JSON data into a LIST and then you have a lot of search methods like the where method

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