更新超广角相机的变焦比例，确保在相机能力允许的情况下使用0.6x的缩放比例，优化相关UI和测试用例。

android/app/src/main/kotlin/com/dronex/rec/recording/RecordingCameraController.kt

@@ -32,6 +32,7 @@ class RecordingCameraController(
     private var camera: Camera? = null
     private var mainCameraId: String? = null
     private var ultraWideCameraId: String? = null
+    private var ultraWideZoomRatio: Float = DEFAULT_ULTRA_WIDE_ZOOM_RATIO
     private var currentLensMode: LensMode = LensMode.MAIN
     private var activeRecording: Recording? = null
     private var boundLifecycleOwner: LifecycleOwner? = null
@@ -224,11 +225,16 @@ class RecordingCameraController(
 
     fun zoomCapabilitiesMap(): Map<String, Any> {
         val zoomState = camera?.cameraInfo?.zoomState?.value
-        val minZoom = if (hasUltraWideCamera()) 0.5f else (zoomState?.minZoomRatio ?: 1f)
+        val minZoom =
+                if (hasUltraWideCamera()) {
+                    ultraWideZoomRatio
+                } else {
+                    zoomState?.minZoomRatio ?: 1f
+                }
         val maxZoom = zoomState?.maxZoomRatio ?: 3f
         val zoom =
                 if (currentLensMode == LensMode.ULTRA_WIDE) {
-                    0.5f
+                    ultraWideZoomRatio
                 } else {
                     (zoomState?.zoomRatio ?: currentZoomRatio).coerceIn(minZoom, maxZoom)
                 }
@@ -248,7 +254,7 @@ class RecordingCameraController(
         if (boundCamera == null) {
             val clamped =
                     if (ratio < 1.0 && hasUltraWideCamera()) {
-                        0.5f
+                        ultraWideZoomRatio
                     } else {
                         ratio.toFloat().coerceAtLeast(1f)
                     }
@@ -299,6 +305,7 @@ class RecordingCameraController(
         boundLifecycleOwner = null
         currentLensMode = LensMode.MAIN
         currentZoomRatio = 1f
+        ultraWideZoomRatio = DEFAULT_ULTRA_WIDE_ZOOM_RATIO
         updateStatus(RecordingStatus(RecordingState.IDLE))
     }
 
@@ -315,7 +322,7 @@ class RecordingCameraController(
     private fun applyCurrentZoom() {
         val boundCamera = camera ?: return
         if (currentLensMode == LensMode.ULTRA_WIDE) {
-            currentZoomRatio = 0.5f
+            currentZoomRatio = ultraWideZoomRatio
             boundCamera.cameraControl.setZoomRatio(1f)
             return
         }
@@ -334,12 +341,18 @@ class RecordingCameraController(
         if (mainCameraId == null) {
             mainCameraId = cameraIdForSelector(provider, CameraSelector.DEFAULT_BACK_CAMERA)
         }
-        ultraWideCameraId = findUltraWideCameraId(provider, mainCameraId)
+        val ultraWideCamera = findUltraWideCamera(provider, mainCameraId)
-        if (ultraWideCameraId == null && currentLensMode == LensMode.ULTRA_WIDE) {
+        ultraWideCameraId = ultraWideCamera?.cameraId
+        ultraWideZoomRatio = ultraWideCamera?.zoomRatio ?: DEFAULT_ULTRA_WIDE_ZOOM_RATIO
+        if (ultraWideCamera == null && currentLensMode == LensMode.ULTRA_WIDE) {
             currentLensMode = LensMode.MAIN
             currentZoomRatio = 1f
         }
-        Log.d(TAG, "mainCameraId=$mainCameraId ultraWideCameraId=$ultraWideCameraId")
+        Log.d(
+                TAG,
+                "mainCameraId=$mainCameraId ultraWideCameraId=$ultraWideCameraId " +
+                        "ultraWideZoomRatio=$ultraWideZoomRatio",
+        )
     }
 
     private fun cameraIdForSelector(
@@ -355,10 +368,10 @@ class RecordingCameraController(
         }
     }
 
-    private fun findUltraWideCameraId(
+    private fun findUltraWideCamera(
             provider: ProcessCameraProvider,
             excludedCameraId: String?,
-    ): String? {
+    ): UltraWideCamera? {
         val manager = appContext.getSystemService(Context.CAMERA_SERVICE) as CameraManager
         val candidates =
                 manager.cameraIdList
@@ -373,13 +386,17 @@ class RecordingCameraController(
         val mainProfile = excludedCameraId?.let { backCameraProfile(manager, it) }
         val widest = candidates.firstOrNull() ?: return null
         if (mainProfile == null) {
-            return widest.cameraId
+            return UltraWideCamera(widest.cameraId, DEFAULT_ULTRA_WIDE_ZOOM_RATIO)
         }
 
         val meaningfullyWider =
                 widest.horizontalFov > mainProfile.horizontalFov * ULTRA_WIDE_FOV_FACTOR ||
                         widest.minFocalLength < mainProfile.minFocalLength * ULTRA_WIDE_FOCAL_FACTOR
-        return if (meaningfullyWider) widest.cameraId else null
+        if (!meaningfullyWider) {
+            return null
+        }
+
+        return UltraWideCamera(widest.cameraId, DEFAULT_ULTRA_WIDE_ZOOM_RATIO)
     }
 
     private fun backCameraProfile(
@@ -457,7 +474,7 @@ class RecordingCameraController(
             return
         }
         if (currentLensMode == LensMode.ULTRA_WIDE) {
-            currentZoomRatio = 0.5f
+            currentZoomRatio = ultraWideZoomRatio
             onComplete(true, zoomCapabilitiesMap(), null)
             return
         }
@@ -473,7 +490,7 @@ class RecordingCameraController(
         }
         try {
             currentLensMode = LensMode.ULTRA_WIDE
-            currentZoomRatio = 0.5f
+            currentZoomRatio = ultraWideZoomRatio
             bindUseCases(provider, lifecycleOwner, selectorForCameraId(ultraWideId))
             applyCurrentZoom()
             onComplete(true, zoomCapabilitiesMap(), null)
@@ -539,8 +556,14 @@ class RecordingCameraController(
             val horizontalFov: Double,
     )
 
+    private data class UltraWideCamera(
+            val cameraId: String,
+            val zoomRatio: Float,
+    )
+
     companion object {
         private const val TAG = "RecordingCamera"
+        private const val DEFAULT_ULTRA_WIDE_ZOOM_RATIO = 0.6f
         private const val ULTRA_WIDE_FOV_FACTOR = 1.08
         private const val ULTRA_WIDE_FOCAL_FACTOR = 0.92
     }

lib/features/recording/widgets/widget_recording_hud.dart

@@ -234,7 +234,7 @@ class _ZoomPresetControl extends StatelessWidget {
             for (final preset in availablePresets)
               _ZoomPresetButton(
                 displayRatio: preset,
-                requestRatio: _requestRatioFor(preset),
+                requestRatio: preset,
                 selected: _isPresetSelected(preset),
                 enabled: !_wouldSwitchPhysicalCamera(preset),
                 onSelected: onSelected,
@@ -259,13 +259,6 @@ class _ZoomPresetControl extends StatelessWidget {
     return (zoomRatio - preset).abs() < 0.05;
   }
 
-  double _requestRatioFor(double preset) {
-    if (preset < 1.0) {
-      return minZoomRatio <= 0.5 ? 0.5 : preset;
-    }
-    return preset;
-  }
-
   bool _wouldSwitchPhysicalCamera(double preset) {
     if (!isRecording) {
       return false;

test/features/recording/view_model_recording_test.dart

@@ -77,7 +77,7 @@ void main() {
     });
 
     test(
-      'passes native ultra-wide ratio when camera capabilities allow it',
+      'clamps legacy 0.5x request to 0.6x ultra-wide ratio',
       () async {
         final calls = <MethodCall>[];
         TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
@@ -86,8 +86,8 @@ void main() {
               (call) async {
                 calls.add(call);
                 return <String, dynamic>{
-                  'zoomRatio': 0.5,
+                  'zoomRatio': 0.6,
-                  'minZoomRatio': 0.5,
+                  'minZoomRatio': 0.6,
                   'maxZoomRatio': 3.0,
                 };
               },
@@ -101,17 +101,17 @@ void main() {
             .copyWith(
               session: const RecordingSessionState(
                 zoomRatio: 1.0,
-                minZoomRatio: 0.5,
+                minZoomRatio: 0.6,
                 maxZoomRatio: 3.0,
               ),
             );
 
         await notifier.setZoomRatio(0.5);
 
-        expect(calls.single.arguments, <String, dynamic>{'zoomRatio': 0.5});
+        expect(calls.single.arguments, <String, dynamic>{'zoomRatio': 0.6});
         final session = container.read(recordingViewModelProvider).session;
-        expect(session.zoomRatio, 0.5);
+        expect(session.zoomRatio, 0.6);
-        expect(session.minZoomRatio, 0.5);
+        expect(session.minZoomRatio, 0.6);
         expect(session.maxZoomRatio, 3.0);
       },
     );

test/features/recording/widget_recording_hud_test.dart

@@ -54,7 +54,7 @@ void main() {
     expect(find.text('3x'), findsNothing);
   });
 
-  testWidgets('shows 0.6x when 0.5x camera capability supports it', (
+  testWidgets('shows 0.6x when ultra-wide camera capability is below 0.6', (
     tester,
   ) async {
     await pumpHud(tester, minZoomRatio: 0.5);
@@ -75,7 +75,7 @@ void main() {
     expect(find.text('1x'), findsOneWidget);
   });
 
-  testWidgets('marks current 0.5x zoom ratio as selected on 0.6x UI', (
+  testWidgets('marks current ultra-wide zoom ratio as selected on 0.6x UI', (
     tester,
   ) async {
     await pumpHud(tester, zoomRatio: 0.5, minZoomRatio: 0.5);
@@ -102,7 +102,7 @@ void main() {
     expect(find.text('1x'), findsNothing);
   });
 
-  testWidgets('tapping 0.6x reports 0.5 when camera supports 0.5x', (
+  testWidgets('tapping 0.6x reports 0.6 when camera capability is below 0.6', (
     tester,
   ) async {
     double? selected;
@@ -115,7 +115,7 @@ void main() {
     await tester.tap(find.text('0.6x'));
     await tester.pump();
 
-    expect(selected, 0.5);
+    expect(selected, 0.6);
   });
 
   testWidgets('tapping 0.6x reports 0.6 when camera only supports 0.6x', (
@@ -148,7 +148,7 @@ void main() {
     expect(mainButton.enabled, isFalse);
   });
 
-  testWidgets('disables main zoom presets while recording on 0.5x', (
+  testWidgets('disables main zoom presets while recording on ultra-wide', (
     tester,
   ) async {
     await pumpHud(tester, zoomRatio: 0.5, minZoomRatio: 0.5, isRecording: true);