Flutter安卓广播接收插件flutter_android_broadcasts的使用

Flutter安卓广播接收插件flutter_android_broadcasts的使用

概述

flutter_android_broadcasts 是一个用于发送和接收广播的 Flutter 插件。该插件的 API 受 Android 的 BroadcastReceiver 启发，并在 iOS 上使用 NotificationCenter。

快速开始

首先，在 pubspec.yaml 文件中添加 flutter_android_broadcasts 包：

dependencies:
  flutter_android_broadcasts: ^0.0.1

然后运行 flutter pub get 来安装该包。

接下来，通过以下代码订阅广播：

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

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(MyApp());
}

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

class _MyAppState extends State<MyApp> {
  BroadcastReceiver receiver = BroadcastReceiver(
    names: ["de.kevlatus.flutter_broadcasts_example.demo_action"],
  );

  [@override](/user/override)
  void initState() {
    super.initState();
    receiver.start();
    receiver.messages.listen(print);
  }

  [@override](/user/override)
  void dispose() {
    receiver.stop();
    super.dispose();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Broadcasts Demo'),
        ),
        body: Column(
          children: [
            TextButton(
              child: Text('Send Broadcast'),
              onPressed: () {
                sendBroadcast(
                  BroadcastMessage(
                    name: "de.kevlatus.flutter_broadcasts_example.demo_action",
                  ),
                );
              },
            ),
            StreamBuilder<BroadcastMessage>(
              initialData: null,
              stream: receiver.messages,
              builder: (context, snapshot) {
                switch (snapshot.connectionState) {
                  case ConnectionState.active:
                    return Text(snapshot.data?.name ?? '');

                  case ConnectionState.none:
                  case ConnectionState.done:
                  case ConnectionState.waiting:
                  default:
                    return SizedBox();
                }
              },
            ),
          ],
        ),
      ),
    );
  }
}

更多关于Flutter安卓广播接收插件flutter_android_broadcasts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安卓广播接收插件flutter_android_broadcasts的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


flutter_android_broadcasts 是一个 Flutter 插件，用于在 Flutter 应用中接收 Android 系统的广播（Broadcast）。通过这个插件，你可以在 Flutter 应用中监听 Android 系统的各种广播事件，例如网络状态变化、电池状态变化、屏幕开关等。

安装插件

首先，你需要在 pubspec.yaml 文件中添加 flutter_android_broadcasts 插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  flutter_android_broadcasts: ^0.0.1  # 请检查最新版本

然后运行 flutter pub get 来安装插件。

使用插件

1. 导入插件

在 Dart 文件中导入插件：

import 'package:flutter_android_broadcasts/flutter_android_broadcasts.dart';

2. 初始化广播接收器

你可以使用 FlutterAndroidBroadcasts 类来初始化广播接收器并监听特定的广播事件。

FlutterAndroidBroadcasts broadcasts = FlutterAndroidBroadcasts();

3. 监听广播事件

你可以使用 listenToBroadcast 方法来监听特定的广播事件。例如，监听网络状态变化的广播：

broadcasts.listenToBroadcast('android.net.conn.CONNECTIVITY_CHANGE').listen((event) {
  print('Network state changed: $event');
});

4. 停止监听

当你不再需要监听广播时，可以调用 stopListening 方法来停止监听：

broadcasts.stopListening('android.net.conn.CONNECTIVITY_CHANGE');

示例代码

以下是一个完整的示例代码，展示了如何使用 flutter_android_broadcasts 插件监听网络状态变化的广播：

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

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

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

class BroadcastExample extends StatefulWidget {
  @override
  _BroadcastExampleState createState() => _BroadcastExampleState();
}

class _BroadcastExampleState extends State<BroadcastExample> {
  FlutterAndroidBroadcasts broadcasts = FlutterAndroidBroadcasts();
  String _networkState = 'Unknown';

  @override
  void initState() {
    super.initState();
    _startListening();
  }

  void _startListening() {
    broadcasts.listenToBroadcast('android.net.conn.CONNECTIVITY_CHANGE').listen((event) {
      setState(() {
        _networkState = 'Network state changed: $event';
      });
    });
  }

  @override
  void dispose() {
    broadcasts.stopListening('android.net.conn.CONNECTIVITY_CHANGE');
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Android Broadcast Example'),
      ),
      body: Center(
        child: Text(_networkState),
      ),
    );
  }
}

注意事项

  1. 权限：某些广播事件可能需要特定的权限。例如，监听网络状态变化需要 ACCESS_NETWORK_STATE 权限。你需要在 AndroidManifest.xml 中添加相应的权限声明：

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