Flutter JSON编辑插件json_editor的使用
Flutter JSON编辑插件json_editor的使用
特性
- 支持添加注释;
- 支持显示无效JSON文本错误;
- 格式化JSON文本;
- 输出自定义JSON数据模型:
JsonElement
。
开始使用
dependencies:
json_editor: ^0.0.7
屏幕截图
使用示例
import 'package:json_editor/json_editor.dart';
// 使用字符串创建JsonEditor实例
JsonEditor.string(
jsonString: '''
{
// This is a comment
"name": "young chan",
"number": 100,
"boo": true,
"user": {"age": 20, "tall": 1.8},
"cities": ["beijing", "shanghai", "shenzhen"]
}
''',
onValueChanged: (value) {
print(value);
},
)
// 使用对象创建JsonEditor实例
JsonEditor.object(
object: const {
"name": "young",
"number": 100,
"boo": true,
"user": {"age": 20, "tall": 1.8},
"cities": ["beijing", "shanghai", "shenzhen"]
},
onValueChanged: (value) {
print(value);
},
)
JsonElement
是一个包含 key
、value
和 comment
的数据模型。
// 使用元素创建JsonEditor实例
JsonEditor.element(
element: JsonElement(),
onValueChanged: (value) {
print(value);
},
)
主题
如果你想自定义JSON主题,可以使用 JsonEditorTheme
widget。
JsonEditorTheme(
themeData: JsonEditorThemeData.defaultTheme(),
child: JsonEditor.object(
object: const {
"name": "young",
"number": 100,
"boo": true,
"user": {"age": 20, "tall": 1.8},
"cities": ["beijing", "shanghai", "shenzhen"]
},
onValueChanged: (value) {
print(value);
},
)
)
许可证
查看 LICENSE
import 'package:flutter/material.dart';
import 'package:json_editor/json_editor.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// 这是应用程序的根。
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
[@override](/user/override)
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool _darkMode = false;
JsonElement? _elementResult;
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: _darkMode
? ThemeData.dark().scaffoldBackgroundColor
: ThemeData.light().scaffoldBackgroundColor,
appBar: AppBar(
title: const Text('JsonEditor'),
),
body: Padding(
padding: const EdgeInsets.all(16),
child: Column(
children: [
Row(
children: [
Switch(
value: _darkMode,
onChanged: (b) {
setState(() {
_darkMode = b;
});
}),
const SizedBox(width: 8),
Text(
'Dark Mode',
style: TextStyle(
color: _darkMode ? Colors.white : Colors.black,
),
),
const SizedBox(
width: 16,
),
ElevatedButton(
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(
builder: (context) => ObjectDemoPage(
obj: _elementResult?.toObject(),
)));
},
child: Text('Object Demo')),
const SizedBox(
width: 16,
),
ElevatedButton(
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(
builder: (context) => ElementDemoPage(
element: _elementResult,
)));
},
child: Text('Element Demo')),
],
),
Expanded(
child: Theme(
data: _darkMode ? ThemeData.dark() : ThemeData.light(),
child: JsonEditor.string(
jsonString: '''
{
// This is a comment
"name": "young chan",
"number": 100,
"boo": true,
"user": {"age": 20, "tall": 1.8},
"cities": ["beijing", "shanghai", "shenzhen"]
}''',
onValueChanged: (value) {
_elementResult = value;
print(value);
},
),
),
)
],
)))
}
}
class ObjectDemoPage extends StatelessWidget {
const ObjectDemoPage({Key? key, this.obj}) : super(key: key);
final Object? obj;
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Object Demo'),
),
body: Padding(
padding: const EdgeInsets.all(16),
child: JsonEditor.object(
object: obj,
onValueChanged: (value) {
var json = value.toJson();
print(json);
var fromJson = JsonElement.fromJson(json);
print(fromJson);
},
),
),
);
}
}
class ElementDemoPage extends StatelessWidget {
const ElementDemoPage({Key? key, this.element}) : super(key: key);
final JsonElement? element;
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Element Demo'),
),
body: Padding(
padding: const EdgeInsets.all(16),
child: JsonEditor.element(
element: element,
onValueChanged: (value) {
var json = value.toJson();
print(json);
var fromJson = JsonElement.fromJson(json);
print(fromJson);
},
),
),
);
}
}
更多关于Flutter JSON编辑插件json_editor的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter JSON编辑插件json_editor的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然,以下是如何在Flutter项目中使用json_editor
插件的一个简单示例。这个插件允许你以可视化的方式编辑JSON数据。
首先,确保你的Flutter项目已经创建。如果还没有创建,可以使用以下命令:
flutter create my_json_editor_app
cd my_json_editor_app
然后,在pubspec.yaml
文件中添加json_editor
依赖:
dependencies:
flutter:
sdk: flutter
json_editor: ^2.0.0 # 请检查最新版本号并替换
接下来,运行flutter pub get
来安装依赖。
一旦依赖安装完成,你可以在lib/main.dart
文件中使用json_editor
插件。以下是一个基本的示例代码:
import 'package:flutter/material.dart';
import 'package:json_editor/json_editor.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter JSON Editor Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
String initialJson = '''
{
"name": "John Doe",
"age": 30,
"email": "john.doe@example.com"
}
''';
String? jsonData;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Flutter JSON Editor Demo'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
'Edit JSON:',
style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
),
SizedBox(height: 16),
Expanded(
child: JsonEditor(
initialJson: initialJson,
onChanged: (newJson) {
setState(() {
jsonData = newJson;
});
},
),
),
SizedBox(height: 16),
Text(
'Current JSON:',
style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
),
SizedBox(height: 8),
Text(
jsonData ?? 'No data yet',
style: TextStyle(fontSize: 16),
),
],
),
),
);
}
}
在这个示例中:
MyApp
是应用程序的入口。MyHomePage
是主页面,它包含一个状态(_MyHomePageState
),用于管理JSON数据的编辑和显示。initialJson
是一个初始的JSON字符串,用于在JsonEditor
控件中进行编辑。JsonEditor
控件用于可视化地编辑JSON数据。当JSON数据发生变化时,onChanged
回调函数会被触发,更新jsonData
状态。Text
控件用于显示当前的JSON数据。
运行这个Flutter应用程序,你将看到一个简单的界面,允许你编辑JSON数据,并实时显示编辑后的结果。
希望这个示例能帮助你理解如何在Flutter项目中使用json_editor
插件。如果你有任何其他问题,欢迎随时提问!