[fix] Android 햅틱 피드백 강도 보정

lib/bridge/handlers/device_bridge_handler.dart

@@ -5,6 +5,7 @@ import 'package:app/permissions/FirebaseConfig.dart';
 import 'package:app/utils/env/env.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_inappwebview/flutter_inappwebview.dart';
+import 'package:vibration/vibration.dart';
 
 /// 디바이스 토큰, 햅틱, 환경 전환 관련 브릿지 핸들러
 mixin DeviceBridgeHandler on BridgeHandlerBase {
@@ -43,24 +44,51 @@ mixin DeviceBridgeHandler on BridgeHandlerBase {
           return;
         }
 
-        switch (hapticType) {
-          case 'light':
-            await HapticFeedback.lightImpact();
-            break;
-          case 'medium':
-            await HapticFeedback.mediumImpact();
-            break;
-          case 'heavy':
-            await HapticFeedback.heavyImpact();
-            break;
-          case 'selection':
-            await HapticFeedback.selectionClick();
-            break;
-          case 'vibrate':
-            await HapticFeedback.vibrate();
-            break;
-          default:
-            logger.w('Unknown haptic feedback type: $hapticType');
+        if (Platform.isAndroid &&
+            await Vibration.hasAmplitudeControl() == true) {
+          // Android: Vibration API로 amplitude 직접 제어
+          // amplitude 기준: expo-haptics 프로덕션 값 + Android 공식 디자인 가이드
+          // 레벨 간 최소 1.4배 차이 유지 (Android Haptics Design Principles)
+          switch (hapticType) {
+            case 'light':
+              await Vibration.vibrate(duration: 50, amplitude: 30);
+              break;
+            case 'medium':
+              await Vibration.vibrate(duration: 43, amplitude: 50);
+              break;
+            case 'heavy':
+              await Vibration.vibrate(duration: 60, amplitude: 70);
+              break;
+            case 'selection':
+              await Vibration.vibrate(duration: 20, amplitude: 20);
+              break;
+            case 'vibrate':
+              await Vibration.vibrate(duration: 500, amplitude: 128);
+              break;
+            default:
+              logger.w('Unknown haptic feedback type: $hapticType');
+          }
+        } else {
+          // iOS 또는 amplitude 미지원 Android: Flutter 기본 API 사용
+          switch (hapticType) {
+            case 'light':
+              await HapticFeedback.lightImpact();
+              break;
+            case 'medium':
+              await HapticFeedback.mediumImpact();
+              break;
+            case 'heavy':
+              await HapticFeedback.heavyImpact();
+              break;
+            case 'selection':
+              await HapticFeedback.selectionClick();
+              break;
+            case 'vibrate':
+              await HapticFeedback.vibrate();
+              break;
+            default:
+              logger.w('Unknown haptic feedback type: $hapticType');
+          }
         }
       } else {
         logger.w(

pubspec.lock

@@ -257,6 +257,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.10"
+  device_info_plus:
+    dependency: transitive
+    description:
+      name: device_info_plus
+      sha256: "72d146c6d7098689ff5c5f66bcf593ac11efc530095385356e131070333e64da"
+      url: "https://pub.dev"
+    source: hosted
+    version: "11.3.0"
+  device_info_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: device_info_plus_platform_interface
+      sha256: e1ea89119e34903dca74b883d0dd78eb762814f97fb6c76f35e9ff74d261a18f
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.3"
   dio:
     dependency: transitive
     description:
@@ -1389,6 +1405,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
+  vibration:
+    dependency: "direct main"
+    description:
+      name: vibration
+      sha256: "3b08a0579c2f9c18d5d78cb5c74f1005f731e02eeca6d72561a2e8059bf98ec3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
+  vibration_platform_interface:
+    dependency: transitive
+    description:
+      name: vibration_platform_interface
+      sha256: "6ffeee63547562a6fef53c05a41d4fdcae2c0595b83ef59a4813b0612cd2bc36"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.0.3"
   vm_service:
     dependency: transitive
     description:
@@ -1469,6 +1501,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.13.0"
+  win32_registry:
+    dependency: transitive
+    description:
+      name: win32_registry
+      sha256: "21ec76dfc731550fd3e2ce7a33a9ea90b828fdf19a5c3bcf556fa992cfa99852"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.5"
   xdg_directories:
     dependency: transitive
     description:

pubspec.yaml

@@ -28,6 +28,7 @@ dependencies:
   flutter_native_splash: ^2.4.6
   shared_preferences: ^2.5.2
   share_plus: ^10.1.4
+  vibration: ^2.0.0
 
 dev_dependencies:
   flutter_test: