feat(meeting): 优化悬浮窗权限请求逻辑

添加会话级别的权限请求状态管理，防止重复弹窗
增加权限请求冷却时间和对话框显示状态检查
添加设置跳转失败时的snackbar提示

lib/core/utils/overlay_permission_util.dart

@@ -13,6 +13,27 @@ enum OverlayPermissionScene {
 /// 悬浮窗权限管理工具类
 class OverlayPermissionUtil {
   static const MethodChannel _channel = MethodChannel('overlay_permission');
+  static bool _isRequestDialogShowing = false;
+  static DateTime? _lastRequestDialogAt;
+  static const Duration _requestDialogCooldown = Duration(seconds: 20);
+
+  static Future<bool> openOverlayPermissionSettings() async {
+    if (!Platform.isAndroid) return true;
+    try {
+      final bool opened =
+          await _channel.invokeMethod('requestOverlayPermission');
+      if (!opened) {
+        Get.snackbar(
+          'permissionRequestError'.tr,
+          'overlayPermissionOpenSettingsFailed'.tr,
+        );
+      }
+      return opened;
+    } catch (e) {
+      Logger.error('跳转悬浮窗权限设置失败: $e');
+      return false;
+    }
+  }
 
   /// 检查是否有悬浮窗权限
   static Future<bool> hasOverlayPermission() async {
@@ -49,38 +70,42 @@ class OverlayPermissionUtil {
           'overlayPermissionRecordingDesc', // 为了在录音过程中显示录音悬浮条（计时/暂停/继续），需要悬浮窗权限。
       };
 
-      // 显示说明对话框
+      final now = DateTime.now();
-      bool? userAgreed = await Get.dialog<bool>(
+      if (_isRequestDialogShowing) return false;
+      final lastAt = _lastRequestDialogAt;
+      if (lastAt != null && now.difference(lastAt) < _requestDialogCooldown) {
+        return false;
+      }
+
+      _isRequestDialogShowing = true;
+      _lastRequestDialogAt = now;
+      bool? userAgreed;
+      try {
+        userAgreed = await Get.dialog<bool>(
           AlertDialog(
-          title: Text('overlayPermissionTitle'.tr), // 悬浮窗权限
+            title: Text('overlayPermissionTitle'.tr),
-          content: Text(explanationKey.tr), // 按场景显示不同说明文案
+            content: Text(explanationKey.tr),
             actions: [
               TextButton(
                 onPressed: () => Get.back(result: false),
-              child: Text('cancel'.tr), // 取消
+                child: Text('cancel'.tr),
               ),
               ElevatedButton(
                 onPressed: () => Get.back(result: true),
-              child: Text('goToSettings'.tr), // 去设置
+                child: Text('goToSettings'.tr),
               ),
             ],
           ),
           barrierDismissible: false,
         );
+      } finally {
+        _isRequestDialogShowing = false;
+      }
 
       if (userAgreed == true) {
         try {
-          // 跳转系统设置页
+          final bool opened = await openOverlayPermissionSettings();
-          final bool opened =
+          if (!opened) return false;
-              await _channel.invokeMethod('requestOverlayPermission');
-          if (!opened) {
-            Get.snackbar(
-              'permissionRequestError'.tr,
-              'overlayPermissionOpenSettingsFailed'
-                  .tr, // 无法自动跳转到系统设置，请手动前往系统设置开启悬浮窗权限。
-            );
-            return false;
-          }
           // 等待用户操作完成后重新检查权限
           await Future.delayed(const Duration(seconds: 1));
           return await hasOverlayPermission();

lib/modules/meeting/controllers/meeting_record_controller.dart

@@ -41,6 +41,9 @@ class MeetingRecordController extends GetxController
   Timer? _routeMonitorTimer;
   StreamSubscription<String>? _recordingFloatingActionSubscription;
   bool _floatingBarManuallyClosed = false;
+  bool _overlayPermissionPromptedThisSession = false;
+  bool _overlayPermissionSnackShownThisSession = false;
+  bool _overlayPermissionRequesting = false;
   AppLifecycleState _appLifecycleState = AppLifecycleState.resumed;
   String _lastKnownRoute = '';
 
@@ -152,13 +155,8 @@ class MeetingRecordController extends GetxController
     if (!isRecording.value) return;
     if (_floatingBarManuallyClosed) return;
 
-    final hasPermission = await OverlayPermissionUtil.hasOverlayPermission();
+    final granted = await _ensureAndroidOverlayPermissionForFloatingBar();
-    if (!hasPermission) {
-      final granted = await OverlayPermissionUtil.requestOverlayPermission(
-        scene: OverlayPermissionScene.recordingFloatingBar,
-      );
     if (!granted) return;
-    }
 
     final typeText = _getRecordingTypeText();
     final durationText = _formatTimeForFloatingBar(milliseconds.value);
@@ -191,6 +189,54 @@ class MeetingRecordController extends GetxController
     });
   }
 
+  void _showOverlayPermissionSnackOnce() {
+    if (_overlayPermissionSnackShownThisSession) return;
+    _overlayPermissionSnackShownThisSession = true;
+    Get.snackbar(
+      'overlayPermissionTitle'.tr,
+      'overlayPermissionRecordingDesc'.tr,
+      snackPosition: SnackPosition.BOTTOM,
+      duration: const Duration(seconds: 4),
+      mainButton: TextButton(
+        onPressed: () {
+          unawaited(OverlayPermissionUtil.openOverlayPermissionSettings());
+        },
+        child: Text('goToSettings'.tr),
+      ),
+    );
+  }
+
+  Future<bool> _ensureAndroidOverlayPermissionForFloatingBar() async {
+    if (!Platform.isAndroid) return true;
+    if (!isRecording.value) return false;
+
+    final hasPermission = await OverlayPermissionUtil.hasOverlayPermission();
+    if (hasPermission) return true;
+
+    if (_appLifecycleState != AppLifecycleState.resumed) {
+      return false;
+    }
+
+    if (_overlayPermissionPromptedThisSession || _overlayPermissionRequesting) {
+      _showOverlayPermissionSnackOnce();
+      return false;
+    }
+
+    _overlayPermissionPromptedThisSession = true;
+    _overlayPermissionRequesting = true;
+    try {
+      final granted = await OverlayPermissionUtil.requestOverlayPermission(
+        scene: OverlayPermissionScene.recordingFloatingBar,
+      );
+      if (!granted) {
+        _showOverlayPermissionSnackOnce();
+      }
+      return granted;
+    } finally {
+      _overlayPermissionRequesting = false;
+    }
+  }
+
   Future<void> _stopAndroidRecordingFloatingBar() async {
     if (!Platform.isAndroid) return;
     _recordingFloatingBarTimer?.cancel();
@@ -513,6 +559,9 @@ class MeetingRecordController extends GetxController
     });
 
     isRecording.value = true;
+    _overlayPermissionPromptedThisSession = false;
+    _overlayPermissionSnackShownThisSession = false;
+    _overlayPermissionRequesting = false;
     // 更新录音状态
     fileName.value = fullFileName;
     newName.value = fullFileName;