feat(android): add Flutter WebView app with Docker release builds
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import 'dart:async';
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import 'package:file_selector/file_selector.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:webview_flutter/webview_flutter.dart';
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import 'package:webview_flutter_android/webview_flutter_android.dart';
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import 'config.dart';
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Future<void> main() async {
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WidgetsFlutterBinding.ensureInitialized();
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// 全面屏：内容延伸到状态栏/导航栏之下，刘海与手势区交给 SafeArea 处理
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await SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
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runApp(const DshApp());
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}
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class DshApp extends StatelessWidget {
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const DshApp({super.key});
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@override
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Widget build(BuildContext context) {
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return AnnotatedRegion<SystemUiOverlayStyle>(
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// 站点为深色主题：状态栏透明、图标反白
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value: const SystemUiOverlayStyle(
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statusBarColor: Colors.transparent,
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statusBarIconBrightness: Brightness.light,
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systemNavigationBarColor: Colors.transparent,
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systemNavigationBarIconBrightness: Brightness.light,
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),
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child: MaterialApp(
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title: 'DSH 工作台',
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debugShowCheckedModeBanner: false,
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theme: ThemeData(
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useMaterial3: true,
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colorScheme: ColorScheme.fromSeed(
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seedColor: const Color(kThemeColorValue),
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brightness: Brightness.dark,
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),
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scaffoldBackgroundColor: const Color(kThemeColorValue),
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),
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home: const HomePage(),
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),
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);
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}
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}
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class HomePage extends StatefulWidget {
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const HomePage({super.key});
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@override
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State<HomePage> createState() => _HomePageState();
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}
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class _HomePageState extends State<HomePage> {
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/// 原生下载通道（MainActivity 中用系统 DownloadManager 实现）
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static const MethodChannel _downloadsChannel = MethodChannel(
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'dsh.workbench/downloads',
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);
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static final Uri _siteUri = Uri.parse(kSiteUrl);
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late final WebViewController _controller;
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bool _loading = true;
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String? _loadError;
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@override
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void initState() {
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super.initState();
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_controller = _buildController();
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}
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WebViewController _buildController() {
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final controller = WebViewController()
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..setJavaScriptMode(JavaScriptMode.unrestricted)
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..setBackgroundColor(const Color(kThemeColorValue))
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..setNavigationDelegate(
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NavigationDelegate(
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onPageStarted: (_) {
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if (mounted) {
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setState(() {
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_loading = true;
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_loadError = null;
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});
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}
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},
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onPageFinished: (_) {
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if (mounted) setState(() => _loading = false);
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},
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onWebResourceError: (error) {
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// 只把主文档加载失败视作页面错误；子资源错误（图片等）
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// 以及被新导航打断（ERR_ABORTED）的情况交给页面自行处理
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if (!(error.isForMainFrame ?? false)) return;
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if (error.description.contains('ERR_ABORTED')) return;
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if (mounted) {
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setState(() {
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_loading = false;
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_loadError = error.description;
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});
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}
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},
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onNavigationRequest: _onNavigationRequest,
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),
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)
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..loadRequest(Uri.parse(kSiteUrl));
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// Android 专属能力：文件选择器（上传）、原生 JS 对话框（alert/confirm）
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final platform = controller.platform;
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if (platform is AndroidWebViewController) {
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platform
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..setOnShowFileSelector(_onShowFileSelector)
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..setOnJavaScriptAlertDialog(_onJavaScriptAlert)
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..setOnJavaScriptConfirmDialog(_onJavaScriptConfirm);
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}
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return controller;
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}
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/// 面板用 window.location.assign 触发下载（文件/目录 ZIP/备份包），
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/// 这里拦下来交给原生 DownloadManager（携带登录 Cookie），WebView 停留原页。
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NavigationDecision _onNavigationRequest(NavigationRequest request) {
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final uri = Uri.tryParse(request.url);
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if (uri != null && _isPanelDownload(uri)) {
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_startDownload(uri);
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return NavigationDecision.prevent;
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}
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return NavigationDecision.navigate;
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}
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bool _isPanelDownload(Uri uri) {
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if (uri.host != _siteUri.host) return false;
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// 工作区文件/目录 ZIP 下载
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if (uri.path.endsWith('/api/ws/download')) return true;
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// 配置备份包下载
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if (uri.path.endsWith('/backups') &&
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uri.queryParameters.containsKey('download')) {
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return true;
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}
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return false;
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}
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Future<void> _startDownload(Uri uri) async {
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try {
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await _downloadsChannel.invokeMethod<bool>('download', {
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'url': uri.toString(),
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});
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} on PlatformException catch (e) {
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if (mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text('下载失败：${e.message ?? '未知错误'}')),
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);
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}
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}
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}
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/// WebView 里的 <input type="file"> 上传（工作区上传/备份导入）。
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/// Android 的类型过滤一次只支持单一 MIME 或单一扩展名，
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/// 多约束时退化为不限类型，避免选择器异常。
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Future<List<String>> _onShowFileSelector(FileSelectorParams params) async {
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final typeGroups = <XTypeGroup>[];
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final mimes = params.acceptTypes.where((t) => t.contains('/')).toList();
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if (mimes.length == 1) {
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typeGroups.add(XTypeGroup(mimeTypes: mimes));
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} else {
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final exts = params.acceptTypes
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.where((t) => t.startsWith('.'))
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.map((t) => t.toLowerCase())
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.toList();
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if (exts.length == 1) typeGroups.add(XTypeGroup(extensions: exts));
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}
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if (params.mode == FileSelectorMode.openMultiple) {
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final files = await openFiles(acceptedTypeGroups: typeGroups);
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return files.map((f) => f.path).toList();
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}
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final file = await openFile(acceptedTypeGroups: typeGroups);
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return file == null ? const <String>[] : [file.path];
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}
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/// 面板少量路径仍使用 window.alert / window.confirm，
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/// 未注册回调时 WebView 会静默返回 false，必须在这里补上。
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Future<void> _onJavaScriptAlert(JavaScriptAlertDialogRequest request) async {
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if (!mounted) return;
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await showDialog<void>(
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context: context,
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builder: (context) => AlertDialog(
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content: Text(request.message),
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actions: [
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TextButton(
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onPressed: () => Navigator.of(context).pop(),
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child: const Text('确定'),
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),
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],
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),
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);
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}
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Future<bool> _onJavaScriptConfirm(
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JavaScriptConfirmDialogRequest request,
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) async {
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if (!mounted) return false;
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final confirmed = await showDialog<bool>(
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context: context,
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builder: (context) => AlertDialog(
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content: Text(request.message),
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actions: [
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TextButton(
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onPressed: () => Navigator.of(context).pop(false),
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child: const Text('取消'),
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),
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FilledButton(
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onPressed: () => Navigator.of(context).pop(true),
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child: const Text('确定'),
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),
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],
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),
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);
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return confirmed ?? false;
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}
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Future<void> _onPopInvoked(bool didPop, Object? result) async {
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if (didPop) return;
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// 先回退 WebView 历史（SPA 内部导航），没有历史再退出应用
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if (await _controller.canGoBack()) {
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await _controller.goBack();
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} else {
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await SystemNavigator.pop();
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}
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}
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void _retry() {
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setState(() {
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_loadError = null;
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_loading = true;
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});
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unawaited(_controller.reload());
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}
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@override
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Widget build(BuildContext context) {
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return PopScope(
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canPop: false,
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onPopInvokedWithResult: _onPopInvoked,
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child: Scaffold(
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backgroundColor: const Color(kThemeColorValue),
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body: SafeArea(
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child: Stack(
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children: [
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WebViewWidget(controller: _controller),
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if (_loadError != null)
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_ErrorView(message: _loadError!, onRetry: _retry)
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else if (_loading)
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const _LoadingView(),
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],
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),
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),
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),
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);
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}
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}
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class _LoadingView extends StatelessWidget {
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const _LoadingView();
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@override
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Widget build(BuildContext context) {
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return const ColoredBox(
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color: Color(kThemeColorValue),
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child: Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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CircularProgressIndicator(color: Colors.white70),
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SizedBox(height: 16),
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Text('正在加载…', style: TextStyle(color: Colors.white70)),
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],
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),
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),
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);
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}
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}
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class _ErrorView extends StatelessWidget {
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const _ErrorView({required this.message, required this.onRetry});
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final String message;
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final VoidCallback onRetry;
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@override
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Widget build(BuildContext context) {
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return ColoredBox(
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color: const Color(kThemeColorValue),
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child: Center(
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child: Padding(
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padding: const EdgeInsets.all(32),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Icon(Icons.cloud_off, size: 56, color: Colors.white54),
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const SizedBox(height: 16),
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const Text(
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'无法连接到服务器',
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style: TextStyle(color: Colors.white, fontSize: 16),
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),
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const SizedBox(height: 8),
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Text(
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message,
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textAlign: TextAlign.center,
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maxLines: 3,
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overflow: TextOverflow.ellipsis,
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style: const TextStyle(color: Colors.white38, fontSize: 12),
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),
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const SizedBox(height: 20),
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FilledButton.icon(
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onPressed: onRetry,
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icon: const Icon(Icons.refresh),
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label: const Text('重试'),
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),
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],
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),
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),
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),
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);
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}
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}
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