Flutter拖拽与放置功能插件flutter_dnd的使用

发布于 1周前 作者 sinazl 来自 Flutter

Flutter拖拽与放置功能插件flutter_dnd的使用

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flutter_dnd

pub package

一个用于管理Android勿扰模式的Flutter插件。

使用方法

要使用此插件,请在pubspec.yaml文件中添加flutter_dnd作为依赖项:

dependencies:
  flutter_dnd:

确保在您的Android清单文件中添加以下权限:

<uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY"/>

示例

// 导入包
import 'package:flutter_dnd/flutter_dnd.dart';

if (await FlutterDnd.isNotificationPolicyAccessGranted) {
  await FlutterDnd.setInterruptionFilter(FlutterDnd.INTERRUPTION_FILTER_NONE); // 打开勿扰模式 - 所有通知都被抑制。
} else {
  FlutterDnd.gotoPolicySettings();
}
其他过滤器
过滤器 描述
INTERRUPTION_FILTER_ALL 没有通知被抑制。
INTERRUPTION_FILTER_PRIORITY 允许优先级通知。
INTERRUPTION_FILTER_NONE 抑制所有通知。
INTERRUPTION_FILTER_ALARMS 允许闹钟通知。

示例代码

import 'package:flutter/material.dart';
import 'package:flutter_dnd/flutter_dnd.dart';

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

class MyApp extends StatefulWidget {
  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
  String _filterName = '';
  bool? _isNotificationPolicyAccessGranted = false;

  [@override](/user/override)
  void initState() {
    WidgetsBinding.instance!.addObserver(this);
    super.initState();
  }

  [@override](/user/override)
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);
    print(state.toString());
    if (state == AppLifecycleState.resumed) {
      updateUI();
    }
  }

  [@override](/user/override)
  void didChangeDependencies() {
    super.didChangeDependencies();
    updateUI();
  }

  void updateUI() async {
    int? filter = await FlutterDnd.getCurrentInterruptionFilter();
    if (filter != null) {
      String filterName = FlutterDnd.getFilterName(filter);
      bool? isNotificationPolicyAccessGranted =
          await FlutterDnd.isNotificationPolicyAccessGranted;

      setState(() {
        _isNotificationPolicyAccessGranted = isNotificationPolicyAccessGranted;
        _filterName = filterName;
      });
    }
  }

  void setInterruptionFilter(int filter) async {
    final bool? isNotificationPolicyAccessGranted =
        await FlutterDnd.isNotificationPolicyAccessGranted;
    if (isNotificationPolicyAccessGranted != null &&
        isNotificationPolicyAccessGranted) {
      await FlutterDnd.setInterruptionFilter(filter);
      updateUI();
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Flutter DND 示例应用'),
        ),
        body: Center(
          child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
            Text('当前过滤器: $_filterName'),
            SizedBox(height: 10),
            Text(
                '是否具有通知策略访问权限: ${_isNotificationPolicyAccessGranted! ? 'YES' : 'NO'}'),
            SizedBox(height: 10),
            RaisedButton(
              onPressed: () {
                FlutterDnd.gotoPolicySettings();
              },
              child: Text('转到策略设置'),
            ),
            RaisedButton(
              onPressed: () async {
                setInterruptionFilter(FlutterDnd.INTERRUPTION_FILTER_NONE);
              },
              child: Text('打开勿扰模式'),
            ),
            RaisedButton(
              onPressed: () {
                setInterruptionFilter(FlutterDnd.INTERRUPTION_FILTER_ALL);
              },
              child: Text('关闭勿扰模式'),
            ),
            RaisedButton(
              onPressed: () {
                setInterruptionFilter(FlutterDnd.INTERRUPTION_FILTER_ALARMS);
              },
              child: Text('打开勿扰模式 - 允许闹钟'),
            ),
            RaisedButton(
              onPressed: () {
                setInterruptionFilter(FlutterDnd.INTERRUPTION_FILTER_PRIORITY);
              },
              child: Text('打开勿扰模式 - 允许优先级通知'),
            )
          ]),
        ),
      ),
    );
  }
}

更多关于Flutter拖拽与放置功能插件flutter_dnd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拖拽与放置功能插件flutter_dnd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,下面是一个关于如何使用 flutter_dnd 插件来实现 Flutter 应用中的拖拽与放置功能的代码示例。这个插件允许你在 Flutter 应用中实现复杂的拖拽和放置交互。

首先,确保你已经在 pubspec.yaml 文件中添加了 flutter_dnd 依赖:

dependencies:
  flutter:
    sdk: flutter
  flutter_dnd: ^0.5.0  # 请注意版本号,这里是一个示例,使用时应检查最新版本

然后运行 flutter pub get 来安装依赖。

接下来是一个简单的示例,展示了如何使用 flutter_dnd 实现基本的拖拽与放置功能。

import 'package:flutter/material.dart';
import 'package:flutter_dnd/flutter_dnd.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DragAndDropDemo(),
    );
  }
}

class DragAndDropDemo extends StatefulWidget {
  @override
  _DragAndDropDemoState createState() => _DragAndDropDemoState();
}

class _DragAndDropDemoState extends State<DragAndDropDemo> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Drag and Drop Demo'),
      ),
      body: DndProvider(
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              DraggableItem(
                key: UniqueKey(),
                data: 'Item 1',
              ),
              SizedBox(height: 20),
              DraggableItem(
                key: UniqueKey(),
                data: 'Item 2',
              ),
              SizedBox(height: 20),
              DroppableArea(
                accept: ['Item 1', 'Item 2'],
                onDrop: (data) {
                  print('Dropped: $data');
                },
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class DraggableItem extends StatelessWidget {
  final Key key;
  final String data;

  DraggableItem({required this.key, required this.data});

  @override
  Widget build(BuildContext context) {
    return DraggableData(
      data: data,
      child: Container(
        decoration: BoxDecoration(
          color: Colors.blueAccent,
          borderRadius: BorderRadius.circular(8),
        ),
        padding: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
        child: Text(
          data,
          style: TextStyle(color: Colors.white),
        ),
      ),
      feedback: Container(
        decoration: BoxDecoration(
          color: Colors.deepOrangeAccent,
          borderRadius: BorderRadius.circular(8),
        ),
        padding: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
        child: Text(
          data,
          style: TextStyle(color: Colors.white),
        ),
      ),
    );
  }
}

class DroppableArea extends StatelessWidget {
  final List<String> accept;
  final Function(String) onDrop;

  DroppableArea({required this.accept, required this.onDrop});

  @override
  Widget build(BuildContext context) {
    return Droppable(
      accept: accept,
      onWillAccept: (data) {
        // 这里可以添加一些逻辑,比如改变边框颜色表示可以接受
        return true;
      },
      onAccept: (data) {
        onDrop(data);
      },
      child: Container(
        decoration: BoxDecoration(
          border: Border.all(color: Colors.grey, width: 2),
          borderRadius: BorderRadius.circular(8),
        ),
        padding: EdgeInsets.symmetric(horizontal: 16, vertical: 32),
        child: Center(
          child: Text(
            'Drop here',
            style: TextStyle(fontSize: 20),
          ),
        ),
      ),
    );
  }
}

在这个示例中:

  1. DndProvider 是必需的,它为拖拽和放置功能提供了上下文。
  2. DraggableData 包裹了一个可以拖拽的 Container,并指定了拖拽的数据和反馈(拖拽时的显示)。
  3. Droppable 是一个可以接受拖拽数据的区域,它定义了接受的数据类型(通过 accept 参数)以及当数据被放置时的回调(通过 onAccept 参数)。

你可以根据需求进一步自定义和扩展这个示例。希望这对你有所帮助!

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