Flutter JSON数据可视化插件flutter_json_widget的使用
flutter_json_widget简介
flutter_json_widget 是一个用于在 Flutter 应用程序中可视化 JSON 数据的小部件。
使用库
flutter_json_widget 的完整示例可以在其 GitHub 仓库的 /example/ 文件夹中找到。
在项目中使用 flutter_json_widget
1. 添加依赖
在项目的 pubspec.yaml 文件中添加以下依赖：
dependencies:
flutter_json_widget: ^1.0.1
2. 安装依赖
通过命令行安装依赖：
$ flutter pub get
或者，如果您使用的是支持 flutter pub get 的编辑器，请确保启用该功能。
3. 导入库
在 Dart 文件中导入 flutter_json_widget：
import 'package:flutter_json_widget/flutter_json_widget.dart';
4. 使用小部件
以下是一个完整的示例，展示如何在 Flutter 应用程序中使用 JsonViewerWidget 来显示 JSON 数据：
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter_json_widget/flutter_json_widget.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'JsonViewerExample',
theme: ThemeData(primarySwatch: Colors.blue),
home: MyHomePage(title: 'Json Viewer Example'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
[@override](/user/override)
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Map<String, dynamic> jsonObj;
[@override](/user/override)
void initState() {
super.initState();
// 示例 JSON 数据
var testString = '''
{
"ParaString": "www.apigj.com",
"ParaObject": {
"ObjectType": "Api",
"ObjectName": "Manager",
"ObjectId": "Code",
"FatherId": "Generator"
},
"ParaLong": 6222123188092928,
"ParaInt": 5303,
"ParaFloat": -268311581425.664,
"ParaBool": false,
"ParaArrString": ["easy", "fast"],
"ParaArrObj": [
{
"SParaString": "Work efficiently long words long words long words long words long words long words long words long words long words long words long words long words long words ",
"SParaLong": 7996655703949312,
"SParaInt": 8429,
"SParaFloat": -67669103057.3056,
"SParaBool": false,
"SParaArrString": ["har", "zezbehseh"],
"SParaArrLong": [6141464276893696, 2096646955466752],
"SParaArrInt": [1601, 757],
"SParaArrFloat": [-643739466439.0656, -582978647149.7728],
"SParaArrBool": [false, false]
},
{
"SParaString": "Let's go",
"SParaLong": 641970970034176,
"SParaInt": 37,
"SParaFloat": 556457726574.592,
"SParaBool": false,
"SParaArrString": ["miw", "aweler"],
"SParaArrLong": [3828767638159360, 7205915801419776],
"SParaArrInt": [1187, 6397],
"SParaArrFloat": [-744659811617.9968, 494621489417.4208],
"SParaArrBool": [true, false]
}
],
"ParaArrLong": [7607846344589312, 7840335854043136],
"ParaArrInt": [2467, 1733],
"ParaArrFloat": [759502472845.7216, -157877664743.424],
"ParaArrBool": [true, true]
}
''';
jsonObj = jsonDecode(testString);
}
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: SafeArea(
child: SingleChildScrollView(
child: JsonViewerWidget(jsonObj),
),
),
);
}
}更多关于Flutter JSON数据可视化插件flutter_json_widget的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter JSON数据可视化插件flutter_json_widget的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
在Flutter中，flutter_json_widget 是一个用于可视化JSON数据的插件。它可以帮助开发者以树形结构展示JSON数据，方便调试和查看复杂的JSON结构。以下是如何使用 flutter_json_widget 插件的步骤：
1. 添加依赖
首先，你需要在 pubspec.yaml 文件中添加 flutter_json_widget 依赖：
dependencies:
flutter:
sdk: flutter
flutter_json_widget: ^1.0.0
然后运行 flutter pub get 来安装依赖。
2. 导入包
在你的Dart文件中导入 flutter_json_widget 包：
import 'package:flutter_json_widget/flutter_json_widget.dart';
3. 使用 JsonViewer 组件
flutter_json_widget 提供了一个 JsonViewer 组件，你可以将JSON数据传递给它，它会自动将其渲染为树形结构。
import 'package:flutter/material.dart';
import 'package:flutter_json_widget/flutter_json_widget.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('JSON Viewer Example'),
),
body: JsonViewer(
json: {
"name": "John Doe",
"age": 30,
"isMarried": false,
"address": {
"street": "123 Main St",
"city": "Anytown",
"state": "CA",
"zip": "12345"
},
"phoneNumbers": [
{"type": "home", "number": "212 555-1234"},
{"type": "work", "number": "646 555-4567"}
]
},
),
),
);
}
}
4. 运行应用
运行你的Flutter应用，你将看到一个树形结构的JSON数据展示在屏幕上。你可以展开和折叠节点来查看嵌套的JSON数据。
5. 自定义样式（可选）
JsonViewer 组件提供了一些可选的参数来自定义样式，例如：
theme: 设置主题颜色。padding: 设置内边距。fontSize: 设置字体大小。
JsonViewer(
json: {
"name": "John Doe",
"age": 30,
"isMarried": false,
"address": {
"street": "123 Main St",
"city": "Anytown",
"state": "CA",
"zip": "12345"
},
"phoneNumbers": [
{"type": "home", "number": "212 555-1234"},
{"type": "work", "number": "646 555-4567"}
]
},
theme: JsonViewerTheme.dark(),
padding: EdgeInsets.all(16.0),
fontSize: 14.0,
);
6. 处理动态JSON数据
如果你的JSON数据是动态获取的，你可以将 JsonViewer 放在一个有状态的组件中，并在数据加载完成后更新UI。
class DynamicJsonViewer extends StatefulWidget {
[@override](/user/override)
_DynamicJsonViewerState createState() => _DynamicJsonViewerState();
}
class _DynamicJsonViewerState extends State<DynamicJsonViewer> {
Map<String, dynamic> jsonData = {};
[@override](/user/override)
void initState() {
super.initState();
fetchData();
}
Future<void> fetchData() async {
// 模拟异步获取数据
await Future.delayed(Duration(seconds: 2));
setState(() {
jsonData = {
"name": "Jane Doe",
"age": 25,
"isMarried": true,
"address": {
"street": "456 Elm St",
"city": "Othertown",
"state": "NY",
"zip": "67890"
},
"phoneNumbers": [
{"type": "home", "number": "212 555-6789"},
{"type": "work", "number": "646 555-9876"}
]
};
});
}
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Dynamic JSON Viewer'),
),
body: jsonData.isEmpty
? Center(child: CircularProgressIndicator())
: JsonViewer(json: jsonData),
);
}
}