增加后台常驻功能，并在设置里可以通过开关控制该功能使用

android/app/src/main/AndroidManifest.xml

@@ -1,38 +1,40 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
-    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
-    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 
     <!-- android:usesCleartextTraffic: When using native Cronet http client, http urls shall be handled explicitly -->
     <application
-            android:label="天使动漫"
-            android:name="${applicationName}"
-            android:usesCleartextTraffic="true"
-            android:icon="@mipmap/ic_launcher">
+        android:label="天使动漫"
+        android:name="${applicationName}"
+        android:usesCleartextTraffic="true"
+        android:icon="@mipmap/ic_launcher">
         <activity
-                android:name=".MainActivity"
-                android:exported="true"
-                android:launchMode="singleTop"
-                android:theme="@style/Theme.TsdmClient.Launcher"
-                android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
-                android:hardwareAccelerated="true"
-                android:windowSoftInputMode="adjustResize">
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:theme="@style/Theme.TsdmClient.Launcher"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user
                  while the Flutter UI initializes. After that, this theme continues
                  to determine the Window background behind the Flutter UI. -->
             <meta-data
-                    android:name="io.flutter.embedding.android.NormalTheme"
-                    android:resource="@style/NormalTheme"
+                android:name="io.flutter.embedding.android.NormalTheme"
+                android:resource="@style/NormalTheme"
             />
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
         <meta-data
-                android:name="flutterEmbedding"
-                android:value="2"/>
+            android:name="flutterEmbedding"
+            android:value="2" />
     </application>
 </manifest>

ios/Runner/Info.plist

@@ -45,5 +45,10 @@
 	<true/>
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>fetch</string>
+		<string>processing</string>
+	</array>
 </dict>
 </plist>

lib/features/settings/provider/settings_provider.dart

@@ -0,0 +1,30 @@
+// lib/features/settings/provider/settings_provider.dart
+import 'package:flutter/foundation.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import '../../../services/background_service.dart';
+
+class SettingsProvider with ChangeNotifier {
+  bool _backgroundKeepAlive = false;
+
+  bool get backgroundKeepAlive => _backgroundKeepAlive;
+
+  Future<void> setBackgroundKeepAlive(bool value) async {
+    _backgroundKeepAlive = value;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('background_keep_alive', value);
+    notifyListeners();
+
+    // 根据开关状态启动或停止后台任务
+    if (value) {
+      await BackgroundService.startBackgroundTask();
+    } else {
+      await BackgroundService.stopBackgroundTask();
+    }
+  }
+
+  Future<void> loadBackgroundKeepAlive() async {
+    final prefs = await SharedPreferences.getInstance();
+    _backgroundKeepAlive = prefs.getBool('background_keep_alive') ?? false;
+    notifyListeners();
+  }
+}

lib/features/settings/view/settings_page.dart

@@ -46,6 +46,8 @@ import 'package:tsdm_client/widgets/section_switch_list_tile.dart';
 import 'package:tsdm_client/widgets/section_title_text.dart';
 import 'package:tsdm_client/widgets/shutdown.dart';
 import 'package:tsdm_client/widgets/tips.dart';
+import 'package:provider/provider.dart';
+import '../provider/settings_provider.dart';
 
 /// Settings page of the app.
 class SettingsPage extends StatefulWidget {
@@ -865,3 +867,48 @@ class _SettingsPageState extends State<SettingsPage> {
     );
   }
 }
+
+Widget build(BuildContext context) {
+  return CupertinoPageScaffold(
+    navigationBar: CupertinoNavigationBar(
+      middle: Text('设置'),
+    ),
+    child: SafeArea(
+      child: ListView(
+        children: [
+          // ... 其他现有设置项 ...
+
+          // === 添加后台常驻开关 ===
+          CupertinoFormSection.insetGrouped(
+            header: Text('行为'),
+            children: [
+              CupertinoFormRow(
+                prefix: Container(
+                  width: 24, // 留空图标位置
+                ),
+                helper: Text('开启后，应用在后台时会尝试保持活动状态以执行任务'),
+                child: Row(
+                  children: [
+                    Expanded(
+                      child: Text('后台常驻'),
+                    ),
+                    Consumer<SettingsProvider>(
+                      builder: (context, settings, child) {
+                        return CupertinoSwitch(
+                          value: settings.backgroundKeepAlive,
+                          onChanged: (bool value) {
+                            settings.setBackgroundKeepAlive(value);
+                          },
+                        );
+                      },
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ],
+      ),
+    ),
+  );
+}

lib/main.dart

@@ -13,6 +13,7 @@ import 'package:tsdm_client/features/local_notice/callback.dart';
 import 'package:tsdm_client/features/settings/repositories/settings_repository.dart';
 import 'package:tsdm_client/i18n/strings.g.dart';
 import 'package:tsdm_client/instance.dart';
+import 'package:tsdm_client/services/background_service.dart';
 import 'package:tsdm_client/shared/providers/providers.dart';
 import 'package:tsdm_client/shared/providers/proxy_provider/proxy_provider.dart';
 import 'package:tsdm_client/utils/platform.dart';
@@ -31,6 +32,18 @@ Future<void> _boot(List<String> args) async {
   talker.debug('------------------- start app -------------------');
   await initProviders();
 
+  // 初始化后台服务
+  await BackgroundService.initialize();
+
+  // 获取设置仓库并检查后台常驻设置
+  final settingsRepo = getIt.get<SettingsRepository>();
+  final backgroundKeepAliveEnabled = settingsRepo.currentSettings.backgroundKeepAlive ?? false;
+
+  // 如果设置中启用了后台常驻，则启动后台任务
+  if (backgroundKeepAliveEnabled) {
+    await BackgroundService.startBackgroundTask();
+  }
+
   final settings = getIt.get<SettingsRepository>().currentSettings;
 
   final settingsLocale = settings.locale;

lib/services/background_service.dart

@@ -0,0 +1,53 @@
+import 'package:workmanager/workmanager.dart';
+
+@pragma('vm:entry-point')
+void callbackDispatcher() {
+  Workmanager().executeTask((task, inputData) {
+    print("BackgroundTask: TSDM Client is running in background!");
+    return Future.value(true);
+  });
+}
+
+class BackgroundService {
+  static Future<void> initialize() async {
+    try {
+      await Workmanager().initialize(
+        callbackDispatcher,
+        isInDebugMode: false,
+      );
+      print("BackgroundService: Initialized successfully");
+    } catch (e) {
+      print("BackgroundService: Initialization failed - $e");
+      rethrow;
+    }
+  }
+
+  static Future<void> startBackgroundTask() async {
+    try {
+      await Workmanager().registerPeriodicTask(
+        "tsdmBackgroundTask",
+        "tsdmBackgroundTask",
+        frequency: Duration(minutes: 15),
+        initialDelay: Duration(seconds: 10),
+        constraints: Constraints(
+          networkType: NetworkType.connected,
+        ),
+        existingWorkPolicy: ExistingWorkPolicy.replace,
+      );
+      print("BackgroundService: Background task started successfully");
+    } catch (e) {
+      print("BackgroundService: Failed to start background task - $e");
+      rethrow;
+    }
+  }
+
+  static Future<void> stopBackgroundTask() async {
+    try {
+      await Workmanager().cancelByUniqueName("tsdmBackgroundTask");
+      print("BackgroundService: Background task stopped successfully");
+    } catch (e) {
+      print("BackgroundService: Failed to stop background task - $e");
+      rethrow;
+    }
+  }
+}