带消息通道和js注入的flutter web
2024年11月19日
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import 'dart:io'; import 'dart:convert'; import 'dart:typed_data'; import 'package:flutter/material.dart'; import 'package:fluttertoast/fluttertoast.dart'; import 'package:path_provider/path_provider.dart'; import 'package:image_gallery_saver/image_gallery_saver.dart'; import 'package:flutter_inappwebview/flutter_inappwebview.dart'; import 'package:flutter_local_notifications/flutter_local_notifications.dart'; class WebViewPage extends StatefulWidget { const WebViewPage({super.key}); @override State<WebViewPage> createState() => _WebViewPageState(); } class _WebViewPageState extends State<WebViewPage> { final GlobalKey webViewKey = GlobalKey(); late Future<bool> _canGoBack; String? webToken; InAppWebViewController? webViewController; InAppWebViewGroupOptions options = InAppWebViewGroupOptions( crossPlatform: InAppWebViewOptions( useShouldOverrideUrlLoading: true, mediaPlaybackRequiresUserGesture: false, ), android: AndroidInAppWebViewOptions( useHybridComposition: true, ), ios: IOSInAppWebViewOptions( allowsInlineMediaPlayback: true, )); final urlController = TextEditingController(); // Flutter Local Notifications Plugin FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin(); @override void initState() { super.initState(); _canGoBack = Future.value(false); _initializeNotifications(); } // 初始化通知设置 void _initializeNotifications() async { const AndroidInitializationSettings initializationSettingsAndroid = AndroidInitializationSettings('@mipmap/ic_launcher'); const InitializationSettings initializationSettings = InitializationSettings(android: initializationSettingsAndroid); await flutterLocalNotificationsPlugin.initialize(initializationSettings); // 创建通知通道 _createNotificationChannel(); } // 创建通知通道 Future<void> _createNotificationChannel() async { const AndroidNotificationChannel channel = AndroidNotificationChannel( 'chat_messages', // 通道 ID '聊天消息', // 通道名称 description: '显示来自聊天的消息通知', // 通道描述 importance: Importance.high, ); await flutterLocalNotificationsPlugin .resolvePlatformSpecificImplementation< AndroidFlutterLocalNotificationsPlugin>() ?.createNotificationChannel(channel); } // 显示通知 Future<void> _showNotification() async { const AndroidNotificationDetails androidNotificationDetails = AndroidNotificationDetails( 'chat_messages', // 必须与通道 ID 一致 '聊天消息', // 通道名称 importance: Importance.high, priority: Priority.high, ); const NotificationDetails notificationDetails = NotificationDetails(android: androidNotificationDetails); await flutterLocalNotificationsPlugin.show( 0, // 通知 ID '通知标题', // 通知标题 '这是通知正文内容', // 通知正文 notificationDetails, ); } // 保存 Base64 图片到相册 Future<void> saveBase64ImageToGallery(String base64Image) async { try { if (!base64Image.startsWith("data:image/")) { throw FormatException("Invalid Base64 image string"); } Uint8List bytes = base64Decode(base64Image.split(',').last); String timestamp = DateTime.now().millisecondsSinceEpoch.toString(); final directory = await getTemporaryDirectory(); final filePath = '${directory.path}/image_$timestamp.png'; final file = File(filePath); await file.writeAsBytes(bytes); final result = await ImageGallerySaver.saveFile(filePath); if (result['isSuccess']) { Fluttertoast.showToast(msg: "图片保存成功", fontSize: 12.0); } else { Fluttertoast.showToast(msg: "图片保存失败", fontSize: 12.0); } } catch (e) { print('Error saving image: $e'); } } @override Widget build(BuildContext context) { return WillPopScope( onWillPop: () async { if (await webViewController?.canGoBack() ?? false) { webViewController?.goBack(); return false; } else if (ModalRoute.of(context)?.canPop ?? false) { Navigator.of(context).pop(true); return false; } else { return true; } }, child: Scaffold( body: InAppWebView( key: webViewKey, initialUrlRequest: URLRequest( url: Uri.parse("file:///android_asset/build/index.html"), ), initialOptions: options, onWebViewCreated: (controller) { webViewController = controller; webViewController?.addJavaScriptHandler( handlerName: 'saveBase64Image', callback: (args) { print("saveBase64Image: ${args[0]}"); saveBase64ImageToGallery(args[0]); }, ); webViewController?.addJavaScriptHandler( handlerName: 'saveToken', callback: (args) { webToken = args[0]; print("saveToken: ${args[0]}"); }, ); }, onLoadStart: (controller, url) {}, androidOnPermissionRequest: (controller, origin, resources) async { return PermissionRequestResponse( resources: resources, action: PermissionRequestResponseAction.GRANT); }, onLoadStop: (controller, url) async { setState(() { _canGoBack = controller.canGoBack(); }); }, onConsoleMessage: (controller, consoleMessage) { print(consoleMessage); }, ), floatingActionButton: FloatingActionButton( onPressed: () { print("显示通知栏消息"); _showNotification(); }, child: const Icon(Icons.event), ), )); } } |
