删除AndroidManifest.xml中的READ_MEDIA_VIDEO权限，并更新view_model_recording中的权限逻辑。dart确保文件保存权限仅适用于Android SDK版本28及以下。添加测试以验证Android 13和未知SDK版本的权限行为。

2.新增 isSwitchingLens 状态、避免切换镜头    stop 按钮禁用，不会触发 stopRecording
倍距按钮禁用，避免连续切换
ViewModel 层也兜底：isSwitchingLens=true 时直接拒绝 stop
3.合并失败兜底提示

.gitignore

@@ -48,3 +48,5 @@ app.*.map.json
 /android/app/release
 /android/.kotlin
 
+CLAUDE.md
+

android/app/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
     id("dev.flutter.flutter-gradle-plugin")
 }
 
-val appPackageName = "com.dronex.rec"
+val appPackageName = "com.run.sportsx"
 
 android {
     namespace = appPackageName

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.dronex.rec">
+    package="com.run.sportsx">
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
@@ -10,7 +10,6 @@
     <uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
-    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
     <uses-permission
         android:name="android.permission.WRITE_EXTERNAL_STORAGE"
         android:maxSdkVersion="28" />
@@ -20,7 +19,7 @@
         android:required="true" />
 
     <application
-        android:label="飞行极控录像工作台"
+        android:label="酷跑录像工作台"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity
@@ -57,4 +56,4 @@
             <data android:mimeType="text/plain" />
         </intent>
     </queries>
-</manifest>
+</manifest>

android/app/src/main/kotlin/com/dronex/rec/AppConstants.kt

@@ -1,10 +0,0 @@
-package com.dronex.rec
-
-object AppConstants {
-    const val PACKAGE_NAME = "com.dronex.rec"
-    const val PLATFORM_INFO_CHANNEL = "$PACKAGE_NAME/platform_info"
-    const val RECORDING_METHOD_CHANNEL = "$PACKAGE_NAME/recording"
-    const val RECORDING_EVENT_CHANNEL = "$PACKAGE_NAME/recording_events"
-    const val RECORDING_ACTION_START = "$PACKAGE_NAME.recording.START"
-    const val RECORDING_ACTION_STOP = "$PACKAGE_NAME.recording.STOP"
-}

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

@@ -1,316 +0,0 @@
-package com.dronex.rec.recording
-
-import android.content.Context
-import android.util.Log
-import androidx.camera.core.Camera
-import androidx.camera.core.CameraSelector
-import androidx.camera.core.Preview
-import androidx.camera.lifecycle.ProcessCameraProvider
-import androidx.camera.video.Quality
-import androidx.camera.video.QualitySelector
-import androidx.camera.video.Recorder
-import androidx.camera.video.Recording
-import androidx.camera.video.VideoCapture
-import androidx.camera.video.VideoRecordEvent
-import androidx.camera.view.PreviewView
-import androidx.core.content.ContextCompat
-import androidx.lifecycle.LifecycleOwner
-import java.util.concurrent.Executor
-
-class RecordingCameraController(
-        private val appContext: Context,
-) {
-    private val mainExecutor: Executor = ContextCompat.getMainExecutor(appContext)
-
-    private var cameraProvider: ProcessCameraProvider? = null
-    private var preview: Preview? = null
-    private var videoCapture: VideoCapture<Recorder>? = null
-    private var camera: Camera? = null
-    private var activeRecording: Recording? = null
-    private var boundLifecycleOwner: LifecycleOwner? = null
-    private var currentZoomRatio: Float = 1f
-
-    var status: RecordingStatus = RecordingStatus(RecordingState.IDLE)
-        private set
-
-    var statusListener: ((RecordingStatus) -> Unit)? = null
-
-    private var recordingStartedAt: Long = 0L
-    private var latestOutputPath: String? = null
-    private var pendingStopCallback: ((String?) -> Unit)? = null
-
-    fun bindPreview(
-            lifecycleOwner: LifecycleOwner,
-            previewView: PreviewView,
-            onReady: (Boolean) -> Unit,
-    ) {
-        val future = ProcessCameraProvider.getInstance(appContext)
-        future.addListener(
-                {
-                    try {
-                        val provider = future.get()
-                        cameraProvider = provider
-                        boundLifecycleOwner = lifecycleOwner
-
-                        preview =
-                                Preview.Builder().build().also {
-                                    it.surfaceProvider = previewView.surfaceProvider
-                                }
-
-                        val recorder =
-                                Recorder.Builder()
-                                        .setQualitySelector(QualitySelector.from(Quality.HD))
-                                        .build()
-                        videoCapture = VideoCapture.withOutput(recorder)
-
-                        provider.unbindAll()
-                        camera =
-                                provider.bindToLifecycle(
-                                        lifecycleOwner,
-                                        CameraSelector.DEFAULT_BACK_CAMERA,
-                                        preview,
-                                        videoCapture,
-                                )
-                        applyCurrentZoom()
-
-                        updateStatus(RecordingStatus(RecordingState.PREVIEWING))
-                        onReady(true)
-                    } catch (error: Exception) {
-                        Log.e(TAG, "bindPreview failed", error)
-                        updateStatus(
-                                RecordingStatus(
-                                        RecordingState.ERROR,
-                                        message = error.message,
-                                ),
-                        )
-                        onReady(false)
-                    }
-                },
-                mainExecutor,
-        )
-    }
-
-    fun rebindForRecording(
-            lifecycleOwner: LifecycleOwner,
-            previewView: PreviewView,
-            onReady: (Boolean) -> Unit,
-    ) {
-        val provider = cameraProvider
-        if (provider == null) {
-            bindPreview(lifecycleOwner, previewView, onReady)
-            return
-        }
-
-        if (
-                boundLifecycleOwner === lifecycleOwner &&
-                        preview != null &&
-                        videoCapture != null
-        ) {
-            onReady(true)
-            return
-        }
-
-        try {
-            boundLifecycleOwner = lifecycleOwner
-            provider.unbindAll()
-            camera =
-                    provider.bindToLifecycle(
-                            lifecycleOwner,
-                            CameraSelector.DEFAULT_BACK_CAMERA,
-                            preview,
-                            videoCapture,
-                    )
-            applyCurrentZoom()
-            onReady(true)
-        } catch (error: Exception) {
-            Log.e(TAG, "rebindForRecording failed", error)
-            onReady(false)
-        }
-    }
-
-    fun startRecording(
-            withAudio: Boolean,
-            displayName: String?,
-            onStarted: (Boolean, String?) -> Unit,
-    ) {
-        val capture = videoCapture
-        if (capture == null || boundLifecycleOwner == null) {
-            onStarted(false, "Camera not ready")
-            return
-        }
-
-        if (activeRecording != null) {
-            onStarted(false, "Already recording")
-            return
-        }
-
-        val outputOptions =
-                RecordingOutputFactory.buildMediaStoreOutputOptions(
-                        appContext,
-                        displayName,
-                )
-        latestOutputPath = null
-
-        val pending =
-                capture.output.prepareRecording(appContext, outputOptions).apply {
-                    if (withAudio) {
-                        val granted =
-                                ContextCompat.checkSelfPermission(
-                                        appContext,
-                                        android.Manifest.permission.RECORD_AUDIO,
-                                ) == android.content.pm.PackageManager.PERMISSION_GRANTED
-                        if (granted) {
-                            withAudioEnabled()
-                        }
-                    }
-                }
-
-        recordingStartedAt = System.currentTimeMillis()
-        updateStatus(
-                RecordingStatus(
-                        RecordingState.RECORDING,
-                        outputPath = latestOutputPath,
-                ),
-        )
-
-        activeRecording =
-                pending.start(mainExecutor) { event ->
-                    when (event) {
-                        is VideoRecordEvent.Start -> Unit
-                        is VideoRecordEvent.Finalize -> {
-                            activeRecording = null
-                            if (event.hasError()) {
-                                updateStatus(
-                                        RecordingStatus(
-                                                RecordingState.ERROR,
-                                                message = event.cause?.message
-                                                                ?: "Recording failed",
-                                        ),
-                                )
-                            } else {
-                                latestOutputPath = event.outputResults.outputUri.toString()
-                                updateStatus(
-                                        RecordingStatus(
-                                                RecordingState.PREVIEWING,
-                                                outputPath = latestOutputPath,
-                                                elapsedMillis =
-                                                        System.currentTimeMillis() -
-                                                                recordingStartedAt,
-                                        ),
-                                )
-                            }
-                            val stopCallback = pendingStopCallback
-                            pendingStopCallback = null
-                            stopCallback?.invoke(latestOutputPath)
-                        }
-                    }
-                }
-
-        onStarted(true, latestOutputPath ?: "recording")
-    }
-
-    fun stopRecording(onStopped: (String?) -> Unit) {
-        val recording = activeRecording
-        if (recording == null) {
-            onStopped(latestOutputPath)
-            return
-        }
-
-        pendingStopCallback = onStopped
-        updateStatus(
-                RecordingStatus(
-                        RecordingState.STOPPING,
-                        outputPath = latestOutputPath,
-                ),
-        )
-
-        recording.stop()
-        activeRecording = null
-    }
-
-    fun zoomCapabilitiesMap(): Map<String, Any> {
-        val zoomState = camera?.cameraInfo?.zoomState?.value
-        val minZoom = zoomState?.minZoomRatio ?: 1f
-        val maxZoom = zoomState?.maxZoomRatio ?: 3f
-        val zoom = (zoomState?.zoomRatio ?: currentZoomRatio).coerceIn(minZoom, maxZoom)
-        currentZoomRatio = zoom
-        return mapOf(
-                "zoomRatio" to zoom.toDouble(),
-                "minZoomRatio" to minZoom.toDouble(),
-                "maxZoomRatio" to maxZoom.toDouble(),
-        )
-    }
-
-    fun setZoomRatio(
-            ratio: Double,
-            onComplete: (Boolean, Map<String, Any>, String?) -> Unit,
-    ) {
-        val boundCamera = camera
-        if (boundCamera == null) {
-            val clamped = ratio.toFloat().coerceAtLeast(1f)
-            currentZoomRatio = clamped
-            onComplete(true, zoomCapabilitiesMap(), null)
-            return
-        }
-
-        val zoomState = boundCamera.cameraInfo.zoomState.value
-        val minZoom = zoomState?.minZoomRatio ?: 1f
-        val maxZoom = zoomState?.maxZoomRatio ?: clampedMaxZoom()
-        val nextZoom = ratio.toFloat().coerceIn(minZoom, maxZoom)
-        currentZoomRatio = nextZoom
-
-        val future = boundCamera.cameraControl.setZoomRatio(nextZoom)
-        future.addListener(
-                {
-                    try {
-                        future.get()
-                        onComplete(true, zoomCapabilitiesMap(), null)
-                    } catch (error: Exception) {
-                        Log.e(TAG, "setZoomRatio failed", error)
-                        onComplete(false, zoomCapabilitiesMap(), error.message)
-                    }
-                },
-                mainExecutor,
-        )
-    }
-
-    fun unbind() {
-        activeRecording?.stop()
-        activeRecording = null
-        cameraProvider?.unbindAll()
-        cameraProvider = null
-        preview = null
-        videoCapture = null
-        camera = null
-        boundLifecycleOwner = null
-        currentZoomRatio = 1f
-        updateStatus(RecordingStatus(RecordingState.IDLE))
-    }
-
-    fun elapsedMillis(): Long {
-        if (status.state != RecordingState.RECORDING) return 0L
-        return System.currentTimeMillis() - recordingStartedAt
-    }
-
-    private fun updateStatus(next: RecordingStatus) {
-        status = next
-        statusListener?.invoke(next)
-    }
-
-    private fun applyCurrentZoom() {
-        val boundCamera = camera ?: return
-        val zoomState = boundCamera.cameraInfo.zoomState.value
-        val minZoom = zoomState?.minZoomRatio ?: 1f
-        val maxZoom = zoomState?.maxZoomRatio ?: clampedMaxZoom()
-        currentZoomRatio = currentZoomRatio.coerceIn(minZoom, maxZoom)
-        boundCamera.cameraControl.setZoomRatio(currentZoomRatio)
-    }
-
-    private fun clampedMaxZoom(): Float {
-        return camera?.cameraInfo?.zoomState?.value?.maxZoomRatio ?: 3f
-    }
-
-    companion object {
-        private const val TAG = "RecordingCamera"
-    }
-}

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

@@ -1,50 +0,0 @@
-package com.dronex.rec.recording
-
-import android.content.ContentValues
-import android.content.Context
-import android.os.Build
-import android.provider.MediaStore
-import androidx.camera.video.MediaStoreOutputOptions
-import java.text.SimpleDateFormat
-import java.util.Date
-import java.util.Locale
-
-object RecordingOutputFactory {
-    private const val RELATIVE_PATH = "Movies/飞行极控录像工作台"
-    private const val MIME_TYPE = "video/mp4"
-
-    fun buildMediaStoreOutputOptions(
-            context: Context,
-            displayName: String?,
-    ): MediaStoreOutputOptions {
-        val fileName = resolveFileName(displayName)
-        val contentValues =
-                ContentValues().apply {
-                    put(MediaStore.MediaColumns.DISPLAY_NAME, fileName)
-                    put(MediaStore.MediaColumns.MIME_TYPE, MIME_TYPE)
-                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-                        put(MediaStore.Video.Media.RELATIVE_PATH, RELATIVE_PATH)
-                    }
-                }
-
-        return MediaStoreOutputOptions.Builder(
-                        context.contentResolver,
-                        MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
-                )
-                .setContentValues(contentValues)
-                .build()
-    }
-
-    fun resolveFileName(displayName: String?): String {
-        val trimmed = displayName?.trim().orEmpty()
-        if (trimmed.isNotEmpty()) {
-            return if (trimmed.lowercase(Locale.US).endsWith(".mp4")) {
-                trimmed
-            } else {
-                "$trimmed.mp4"
-            }
-        }
-        val timestamp = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(Date())
-        return "REC_$timestamp.mp4"
-    }
-}

android/app/src/main/kotlin/com/run/sportsx/AppConstants.kt

@@ -0,0 +1,10 @@
+package com.run.sportsx
+
+object AppConstants {
+    private const val CHANNEL_NAMESPACE = "app.record_tool"
+    const val PLATFORM_INFO_CHANNEL = "$CHANNEL_NAMESPACE/platform_info"
+    const val RECORDING_METHOD_CHANNEL = "$CHANNEL_NAMESPACE/recording"
+    const val RECORDING_EVENT_CHANNEL = "$CHANNEL_NAMESPACE/recording_events"
+    const val RECORDING_ACTION_START = "$CHANNEL_NAMESPACE.recording.START"
+    const val RECORDING_ACTION_STOP = "$CHANNEL_NAMESPACE.recording.STOP"
+}

android/app/src/main/kotlin/com/run/sportsx/MainActivity.kt

@@ -1,4 +1,4 @@
-package com.dronex.rec
+package com.run.sportsx
 
 import android.content.Context
 import android.content.pm.ApplicationInfo
@@ -7,8 +7,8 @@ import android.os.Build
 import android.os.Environment
 import android.os.StatFs
 import androidx.camera.view.PreviewView
-import com.dronex.rec.recording.RecordingPlatformHandler
-import com.dronex.rec.recording.RecordingPreviewFactory
+import com.run.sportsx.recording.RecordingPlatformHandler
+import com.run.sportsx.recording.RecordingPreviewFactory
 import io.flutter.embedding.android.FlutterActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.MethodChannel

android/app/src/main/kotlin/com/run/sportsx/recording/BatteryOptimizationHelper.kt

@@ -1,4 +1,4 @@
-package com.dronex.rec.recording
+package com.run.sportsx.recording
 
 import android.content.Context
 import android.content.Intent

android/app/src/main/kotlin/com/run/sportsx/recording/DoNotDisturbHelper.kt

@@ -1,4 +1,4 @@
-package com.dronex.rec.recording
+package com.run.sportsx.recording
 
 import android.app.NotificationManager
 import android.content.Context

android/app/src/main/kotlin/com/run/sportsx/recording/RecordingForegroundService.kt

@@ -1,4 +1,4 @@
-package com.dronex.rec.recording
+package com.run.sportsx.recording
 
 import android.app.Notification
 import android.app.NotificationChannel
@@ -14,8 +14,8 @@ import android.os.PowerManager
 import androidx.core.app.NotificationCompat
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.LifecycleService
-import com.dronex.rec.AppConstants
-import com.dronex.rec.MainActivity
+import com.run.sportsx.AppConstants
+import com.run.sportsx.MainActivity
 
 class RecordingForegroundService : LifecycleService() {
     private var wakeLock: PowerManager.WakeLock? = null

android/app/src/main/kotlin/com/run/sportsx/recording/RecordingOutputFactory.kt

@@ -0,0 +1,106 @@
+package com.run.sportsx.recording
+
+import android.content.ContentValues
+import android.content.Context
+import android.os.Build
+import android.provider.MediaStore
+import androidx.camera.video.FileOutputOptions
+import java.io.File
+import java.io.FileInputStream
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+
+object RecordingOutputFactory {
+    private const val RELATIVE_PATH = "Movies/酷跑录像工作台"
+    private const val MIME_TYPE = "video/mp4"
+
+    fun buildSegmentOutputOptions(segmentFile: File): FileOutputOptions {
+        return FileOutputOptions.Builder(segmentFile).build()
+    }
+
+    fun createSegmentFile(
+            context: Context,
+            displayName: String?,
+            index: Int,
+    ): File {
+        val directory = File(context.cacheDir, "recording_segments")
+        if (!directory.exists()) {
+            directory.mkdirs()
+        }
+        val baseName = resolveFileName(displayName).removeSuffix(".mp4")
+        return File(directory, "${baseName}_${System.currentTimeMillis()}_part$index.mp4")
+    }
+
+    fun createMergeFile(context: Context, displayName: String?): File {
+        val directory = File(context.cacheDir, "recording_segments")
+        if (!directory.exists()) {
+            directory.mkdirs()
+        }
+        val baseName = resolveFileName(displayName).removeSuffix(".mp4")
+        return File(directory, "${baseName}_${System.currentTimeMillis()}_merged.mp4")
+    }
+
+    fun publishToMediaStore(
+            context: Context,
+            displayName: String?,
+            sourceFile: File,
+    ): String? {
+        val fileName = resolveFileName(displayName)
+        val contentValues =
+                ContentValues().apply {
+                    put(MediaStore.MediaColumns.DISPLAY_NAME, fileName)
+                    put(MediaStore.MediaColumns.MIME_TYPE, MIME_TYPE)
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                        put(MediaStore.Video.Media.RELATIVE_PATH, RELATIVE_PATH)
+                        put(MediaStore.Video.Media.IS_PENDING, 1)
+                    }
+                }
+
+        val resolver = context.contentResolver
+        val uri =
+                resolver.insert(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, contentValues)
+                        ?: return null
+        try {
+            val outputStream =
+                    resolver.openOutputStream(uri)
+                            ?: throw IllegalStateException("Cannot open MediaStore output stream")
+            outputStream.use { output ->
+                FileInputStream(sourceFile).use { input -> input.copyTo(output) }
+            }
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                val publishedValues =
+                        ContentValues().apply { put(MediaStore.Video.Media.IS_PENDING, 0) }
+                resolver.update(uri, publishedValues, null, null)
+            }
+            return uri.toString()
+        } catch (error: Exception) {
+            resolver.delete(uri, null, null)
+            throw error
+        }
+    }
+
+    fun publishPartToMediaStore(
+            context: Context,
+            displayName: String?,
+            sourceFile: File,
+            partIndex: Int,
+    ): String? {
+        val resolvedName = resolveFileName(displayName)
+        val partName = resolvedName.replace(".mp4", "_part$partIndex.mp4")
+        return publishToMediaStore(context, partName, sourceFile)
+    }
+
+    fun resolveFileName(displayName: String?): String {
+        val trimmed = displayName?.trim().orEmpty()
+        if (trimmed.isNotEmpty()) {
+            return if (trimmed.lowercase(Locale.US).endsWith(".mp4")) {
+                trimmed
+            } else {
+                "$trimmed.mp4"
+            }
+        }
+        val timestamp = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(Date())
+        return "REC_$timestamp.mp4"
+    }
+}

android/app/src/main/kotlin/com/run/sportsx/recording/RecordingPlatformHandler.kt

@@ -1,12 +1,12 @@
-package com.dronex.rec.recording
+package com.run.sportsx.recording
 
 import android.os.Handler
 import android.os.Looper
 import androidx.core.view.WindowCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
-import com.dronex.rec.AppConstants
-import com.dronex.rec.MainActivity
+import com.run.sportsx.AppConstants
+import com.run.sportsx.MainActivity
 import io.flutter.plugin.common.BinaryMessenger
 import io.flutter.plugin.common.EventChannel
 import io.flutter.plugin.common.MethodCall
@@ -196,6 +196,7 @@ class RecordingPlatformHandler(
                         "outputPath" to path,
                         "status" to controller.status.toMap(),
                         "fileSaved" to fileSaved,
+                        "segmentOutputPaths" to controller.segmentOutputPaths(),
                 )
         if (!fileSaved) {
             payload["fileErrorMessage"] = controller.status.message ?: "保存到文件夹失败"

android/app/src/main/kotlin/com/run/sportsx/recording/RecordingPreviewFactory.kt

@@ -1,9 +1,9 @@
-package com.dronex.rec.recording
+package com.run.sportsx.recording
 
 import android.content.Context
 import android.view.View
 import androidx.camera.view.PreviewView
-import com.dronex.rec.MainActivity
+import com.run.sportsx.MainActivity
 import io.flutter.plugin.common.StandardMessageCodec
 import io.flutter.plugin.platform.PlatformView
 import io.flutter.plugin.platform.PlatformViewFactory

android/app/src/main/kotlin/com/run/sportsx/recording/RecordingSegmentMuxer.kt

@@ -0,0 +1,174 @@
+package com.run.sportsx.recording
+
+import android.media.MediaCodec
+import android.media.MediaExtractor
+import android.media.MediaFormat
+import android.media.MediaMuxer
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.nio.ByteBuffer
+
+object RecordingSegmentMuxer {
+    fun mergeOrCopy(
+            segments: List<File>,
+            outputFile: File,
+    ) {
+        val validSegments = segments.filter { it.exists() && it.length() > 0L }
+        require(validSegments.isNotEmpty()) { "No recording segments were generated" }
+        if (validSegments.size == 1) {
+            copyFile(validSegments.first(), outputFile)
+            return
+        }
+
+        MediaMuxer(outputFile.absolutePath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4).use {
+                muxer ->
+            val firstTracks = readTrackFormats(validSegments.first())
+            val videoTrack = firstTracks.video?.let { muxer.addTrack(it) }
+            val audioTrack = firstTracks.audio?.let { muxer.addTrack(it) }
+            require(videoTrack != null) { "No video track in recording segment" }
+
+            muxer.start()
+            var offsetUs = 0L
+            validSegments.forEach { segment ->
+                val durationUs =
+                        copySegmentTracks(
+                                segment = segment,
+                                muxer = muxer,
+                                videoOutputTrack = videoTrack,
+                                audioOutputTrack = audioTrack,
+                                offsetUs = offsetUs,
+                        )
+                offsetUs += durationUs + 1L
+            }
+        }
+    }
+
+    private fun copyFile(source: File, target: File) {
+        FileInputStream(source).use { input ->
+            FileOutputStream(target).use { output -> input.copyTo(output) }
+        }
+    }
+
+    private fun readTrackFormats(file: File): TrackFormats {
+        val extractor = MediaExtractor()
+        extractor.setDataSource(file.absolutePath)
+        try {
+            var video: MediaFormat? = null
+            var audio: MediaFormat? = null
+            for (index in 0 until extractor.trackCount) {
+                val format = extractor.getTrackFormat(index)
+                val mime = format.getString(MediaFormat.KEY_MIME).orEmpty()
+                when {
+                    mime.startsWith("video/") && video == null -> video = format
+                    mime.startsWith("audio/") && audio == null -> audio = format
+                }
+            }
+            return TrackFormats(video = video, audio = audio)
+        } finally {
+            extractor.release()
+        }
+    }
+
+    private fun copySegmentTracks(
+            segment: File,
+            muxer: MediaMuxer,
+            videoOutputTrack: Int,
+            audioOutputTrack: Int?,
+            offsetUs: Long,
+    ): Long {
+        var segmentDurationUs = 0L
+        segmentDurationUs =
+                maxOf(
+                        segmentDurationUs,
+                        copyTrack(segment, muxer, "video/", videoOutputTrack, offsetUs),
+                )
+        if (audioOutputTrack != null) {
+            segmentDurationUs =
+                    maxOf(
+                            segmentDurationUs,
+                            copyTrack(segment, muxer, "audio/", audioOutputTrack, offsetUs),
+                    )
+        }
+        return segmentDurationUs
+    }
+
+    private fun copyTrack(
+            segment: File,
+            muxer: MediaMuxer,
+            mimePrefix: String,
+            outputTrack: Int,
+            offsetUs: Long,
+    ): Long {
+        val extractor = MediaExtractor()
+        extractor.setDataSource(segment.absolutePath)
+        try {
+            val inputTrack = findTrack(extractor, mimePrefix) ?: return 0L
+            extractor.selectTrack(inputTrack)
+            val bufferSize = trackBufferSize(extractor.getTrackFormat(inputTrack))
+            val buffer = ByteBuffer.allocate(bufferSize)
+            val info = MediaCodec.BufferInfo()
+            var firstSampleTimeUs: Long? = null
+            var lastSampleTimeUs = 0L
+
+            while (true) {
+                buffer.clear()
+                val sampleSize = extractor.readSampleData(buffer, 0)
+                if (sampleSize < 0) break
+
+                val sampleTimeUs = extractor.sampleTime
+                val baseTimeUs = firstSampleTimeUs ?: sampleTimeUs.also { firstSampleTimeUs = it }
+                val normalizedTimeUs = (sampleTimeUs - baseTimeUs).coerceAtLeast(0L)
+                info.set(
+                        0,
+                        sampleSize,
+                        offsetUs + normalizedTimeUs,
+                        extractor.sampleFlags,
+                )
+                muxer.writeSampleData(outputTrack, buffer, info)
+                lastSampleTimeUs = normalizedTimeUs
+                extractor.advance()
+            }
+            return lastSampleTimeUs
+        } finally {
+            extractor.release()
+        }
+    }
+
+    private fun findTrack(extractor: MediaExtractor, mimePrefix: String): Int? {
+        for (index in 0 until extractor.trackCount) {
+            val mime = extractor.getTrackFormat(index).getString(MediaFormat.KEY_MIME).orEmpty()
+            if (mime.startsWith(mimePrefix)) {
+                return index
+            }
+        }
+        return null
+    }
+
+    private fun trackBufferSize(format: MediaFormat): Int {
+        return if (format.containsKey(MediaFormat.KEY_MAX_INPUT_SIZE)) {
+            format.getInteger(MediaFormat.KEY_MAX_INPUT_SIZE).coerceAtLeast(DEFAULT_BUFFER_SIZE)
+        } else {
+            DEFAULT_BUFFER_SIZE
+        }
+    }
+
+    private data class TrackFormats(
+            val video: MediaFormat?,
+            val audio: MediaFormat?,
+    )
+
+    private const val DEFAULT_BUFFER_SIZE = 2 * 1024 * 1024
+}
+
+private inline fun MediaMuxer.use(block: (MediaMuxer) -> Unit) {
+    try {
+        block(this)
+    } finally {
+        try {
+            stop()
+        } catch (_: Exception) {
+        }
+        release()
+    }
+}

android/app/src/main/kotlin/com/run/sportsx/recording/RecordingSession.kt

@@ -1,4 +1,4 @@
-package com.dronex.rec.recording
+package com.run.sportsx.recording
 
 import android.content.Context
 import androidx.lifecycle.LifecycleService

android/app/src/main/kotlin/com/run/sportsx/recording/RecordingState.kt

@@ -1,4 +1,4 @@
-package com.dronex.rec.recording
+package com.run.sportsx.recording
 
 enum class RecordingState {
     IDLE,

buildServer.json

@@ -0,0 +1,19 @@
+{
+	"name": "xcode build server",
+	"version": "1.3.0",
+	"bspVersion": "2.2.0",
+	"languages": [
+		"c",
+		"cpp",
+		"objective-c",
+		"objective-cpp",
+		"swift"
+	],
+	"argv": [
+		"/opt/homebrew/bin/xcode-build-server"
+	],
+	"workspace": "/Users/ZhuanZ/Documents/gdfw/record-tool/ios/Runner.xcworkspace",
+	"build_root": "/Users/ZhuanZ/Library/Developer/Xcode/DerivedData/Runner-ckjfuyjdkgumnpbnnftroxddsppq",
+	"scheme": "Runner",
+	"kind": "xcode"
+}

ios/Runner.xcodeproj/project.pbxproj

@@ -507,7 +507,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.dronex.rec;
+				PRODUCT_BUNDLE_IDENTIFIER = com.run.sportsx;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				"PROVISIONING_PROFILE_SPECIFIER[sdk=iphoneos*]" = "dev-profile-dronex";
@@ -696,7 +696,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.dronex.rec;
+				PRODUCT_BUNDLE_IDENTIFIER = com.run.sportsx;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				"PROVISIONING_PROFILE_SPECIFIER[sdk=iphoneos*]" = "dev-profile-dronex";
@@ -725,7 +725,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.dronex.rec;
+				PRODUCT_BUNDLE_IDENTIFIER = com.run.sportsx;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				"PROVISIONING_PROFILE_SPECIFIER[sdk=iphoneos*]" = "dev-profile-dronex";

ios/Runner/Assets.xcassets/StartupBackground.imageset/Contents.json

@@ -4,6 +4,14 @@
       "filename" : "startup_background.png",
       "idiom" : "universal",
       "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
     }
   ],
   "info" : {

ios/Runner/Info.plist

@@ -1,78 +1,78 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
-<dict>
-	<key>CADisableMinimumFrameDurationOnPhone</key>
-	<true/>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>$(DEVELOPMENT_LANGUAGE)</string>
-	<key>CFBundleDisplayName</key>
-	<string>飞行极控录像工作台</string>
-	<key>CFBundleExecutable</key>
-	<string>$(EXECUTABLE_NAME)</string>
-	<key>CFBundleIdentifier</key>
-	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>飞行极控录像工作台</string>
-	<key>CFBundlePackageType</key>
-	<string>APPL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>$(FLUTTER_BUILD_NAME)</string>
-	<key>CFBundleSignature</key>
-	<string>????</string>
-	<key>CFBundleVersion</key>
-	<string>$(FLUTTER_BUILD_NUMBER)</string>
-	<key>LSRequiresIPhoneOS</key>
-	<true/>
-	<key>NSCameraUsageDescription</key>
-	<string>需要访问相机以显示预览并录制视频。</string>
-	<key>NSMicrophoneUsageDescription</key>
-	<string>需要访问麦克风以录制视频声音；未授权时将静音录制。</string>
-	<key>UIFileSharingEnabled</key>
-	<true/>
-	<key>LSSupportsOpeningDocumentsInPlace</key>
-	<true/>
-	<key>UIApplicationSceneManifest</key>
 	<dict>
-		<key>UIApplicationSupportsMultipleScenes</key>
-		<false/>
-		<key>UISceneConfigurations</key>
+		<key>CADisableMinimumFrameDurationOnPhone</key>
+		<true />
+		<key>CFBundleDevelopmentRegion</key>
+		<string>$(DEVELOPMENT_LANGUAGE)</string>
+		<key>CFBundleDisplayName</key>
+		<string>酷跑录像工作台</string>
+		<key>CFBundleExecutable</key>
+		<string>$(EXECUTABLE_NAME)</string>
+		<key>CFBundleIdentifier</key>
+		<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+		<key>CFBundleInfoDictionaryVersion</key>
+		<string>6.0</string>
+		<key>CFBundleName</key>
+		<string>酷跑录像工作台</string>
+		<key>CFBundlePackageType</key>
+		<string>APPL</string>
+		<key>CFBundleShortVersionString</key>
+		<string>$(FLUTTER_BUILD_NAME)</string>
+		<key>CFBundleSignature</key>
+		<string>????</string>
+		<key>CFBundleVersion</key>
+		<string>$(FLUTTER_BUILD_NUMBER)</string>
+		<key>LSRequiresIPhoneOS</key>
+		<true />
+		<key>NSCameraUsageDescription</key>
+		<string>需要访问相机以显示预览并录制视频。</string>
+		<key>NSMicrophoneUsageDescription</key>
+		<string>需要访问麦克风以录制视频声音；未授权时将静音录制。</string>
+		<key>UIFileSharingEnabled</key>
+		<true />
+		<key>LSSupportsOpeningDocumentsInPlace</key>
+		<true />
+		<key>UIApplicationSceneManifest</key>
 		<dict>
-			<key>UIWindowSceneSessionRoleApplication</key>
-			<array>
-				<dict>
-					<key>UISceneClassName</key>
-					<string>UIWindowScene</string>
-					<key>UISceneConfigurationName</key>
-					<string>flutter</string>
-					<key>UISceneDelegateClassName</key>
-					<string>FlutterSceneDelegate</string>
-					<key>UISceneStoryboardFile</key>
-					<string>Main</string>
-				</dict>
-			</array>
+			<key>UIApplicationSupportsMultipleScenes</key>
+			<false />
+			<key>UISceneConfigurations</key>
+			<dict>
+				<key>UIWindowSceneSessionRoleApplication</key>
+				<array>
+					<dict>
+						<key>UISceneClassName</key>
+						<string>UIWindowScene</string>
+						<key>UISceneConfigurationName</key>
+						<string>flutter</string>
+						<key>UISceneDelegateClassName</key>
+						<string>FlutterSceneDelegate</string>
+						<key>UISceneStoryboardFile</key>
+						<string>Main</string>
+					</dict>
+				</array>
+			</dict>
 		</dict>
+		<key>UIApplicationSupportsIndirectInputEvents</key>
+		<true />
+		<key>UILaunchStoryboardName</key>
+		<string>LaunchScreen</string>
+		<key>UIMainStoryboardFile</key>
+		<string>Main</string>
+		<key>UISupportedInterfaceOrientations</key>
+		<array>
+			<string>UIInterfaceOrientationPortrait</string>
+			<string>UIInterfaceOrientationLandscapeLeft</string>
+			<string>UIInterfaceOrientationLandscapeRight</string>
+		</array>
+		<key>UISupportedInterfaceOrientations~ipad</key>
+		<array>
+			<string>UIInterfaceOrientationPortrait</string>
+			<string>UIInterfaceOrientationPortraitUpsideDown</string>
+			<string>UIInterfaceOrientationLandscapeLeft</string>
+			<string>UIInterfaceOrientationLandscapeRight</string>
+		</array>
 	</dict>
-	<key>UIApplicationSupportsIndirectInputEvents</key>
-	<true/>
-	<key>UILaunchStoryboardName</key>
-	<string>LaunchScreen</string>
-	<key>UIMainStoryboardFile</key>
-	<string>Main</string>
-	<key>UISupportedInterfaceOrientations</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-	</array>
-	<key>UISupportedInterfaceOrientations~ipad</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationPortraitUpsideDown</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-	</array>
-</dict>
-</plist>
+</plist>

ios/Runner/PlatformInfoPlugin.swift

@@ -4,7 +4,7 @@ import UIKit
 final class PlatformInfoPlugin: NSObject, FlutterPlugin {
   static func register(with registrar: FlutterPluginRegistrar) {
     let channel = FlutterMethodChannel(
-      name: "com.dronex.rec/platform_info",
+      name: "app.record_tool/platform_info",
       binaryMessenger: registrar.messenger()
     )
     let plugin = PlatformInfoPlugin()

ios/Runner/RecordingPlugin.swift

@@ -336,7 +336,9 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
       }
 
       do {
-        let nextZoom = self.clampedZoomRatio(ratio, for: device)
+        // 入参是显示倍率(1.0x = 主摄)，按 S 基准换算回设备 zoomFactor。
+        let baseline = self.mainBaselineFactor(for: device)
+        let nextZoom = self.clampedZoomRatio(ratio * baseline, for: device)
         try device.lockForConfiguration()
         device.videoZoomFactor = nextZoom
         device.unlockForConfiguration()
@@ -427,11 +429,7 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
       return
     }
 
-    guard
-      let videoDevice = AVCaptureDevice.default(
-        .builtInWideAngleCamera, for: .video, position: .back)
-        ?? AVCaptureDevice.default(for: .video)
-    else {
+    guard let videoDevice = Self.preferredVideoDevice() else {
       throw NSError(
         domain: "RecordingCamera", code: 1,
         userInfo: [NSLocalizedDescriptionKey: "No camera device available"])
@@ -461,10 +459,39 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
     session.commitConfiguration()
 
     configured = true
+    // 默认以主摄(显示 1.0x)开场：虚拟多摄设备里主摄对应的 zoomFactor 是 S。
+    currentZoomRatio = mainBaselineFactor(for: videoDevice)
     try applyCurrentZoom()
     try configureAudioInput(enabled: withAudio)
   }
 
+  /// 优先选用包含超广角的虚拟多摄设备，使 minAvailableVideoZoomFactor 能低于主摄(从而支持 0.6x)。
+  private static func preferredVideoDevice() -> AVCaptureDevice? {
+    let preferredTypes: [AVCaptureDevice.DeviceType] = [
+      .builtInTripleCamera,
+      .builtInDualWideCamera,
+      .builtInWideAngleCamera,
+    ]
+    for type in preferredTypes {
+      if let device = AVCaptureDevice.default(type, for: .video, position: .back) {
+        return device
+      }
+    }
+    return AVCaptureDevice.default(for: .video)
+  }
+
+  /// 虚拟多摄设备中「主摄(显示 1.0x)」对应的设备 zoomFactor 基准 S。
+  /// 取 ultra-wide → wide 的切换点；非虚拟设备无切换点时返回 1.0(向后兼容)。
+  private func mainBaselineFactor(for device: AVCaptureDevice) -> CGFloat {
+    if let first = device.virtualDeviceSwitchOverVideoZoomFactors.first {
+      let value = CGFloat(truncating: first)
+      if value > 0 {
+        return value
+      }
+    }
+    return 1.0
+  }
+
   private func currentZoomCapabilitiesMap() -> [String: Any] {
     guard let device = videoInput?.device else {
       return [
@@ -474,14 +501,16 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
       ]
     }
 
+    // 设备 zoomFactor 以 S 为基准换算成 App 使用的「显示倍率」(1.0x = 主摄)。
+    let baseline = mainBaselineFactor(for: device)
     let minZoom = device.minAvailableVideoZoomFactor
     let maxZoom = device.maxAvailableVideoZoomFactor
     let zoom = clampedZoomRatio(device.videoZoomFactor, for: device)
     currentZoomRatio = zoom
     return [
-      "zoomRatio": Double(zoom),
-      "minZoomRatio": Double(minZoom),
-      "maxZoomRatio": Double(maxZoom),
+      "zoomRatio": Double(zoom / baseline),
+      "minZoomRatio": Double(minZoom / baseline),
+      "maxZoomRatio": Double(maxZoom / baseline),
     ]
   }
 
@@ -604,9 +633,9 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
 }
 
 private enum RecordingChannelNames {
-  static let packageName = "com.dronex.rec"
-  static let method = "\(packageName)/recording"
-  static let events = "\(packageName)/recording_events"
+  static let namespace = "app.record_tool"
+  static let method = "\(namespace)/recording"
+  static let events = "\(namespace)/recording_events"
 }
 
 final class RecordingPlugin: NSObject, FlutterPlugin, FlutterStreamHandler {

lib/app/config/app_config.dart

@@ -21,7 +21,7 @@ class AppConfig {
   static late EnvironmentValues current;
   static AppPackageInfo? packageInfo;
 
-  static const appName = '飞行极控录像工作台';
+  static const appName = '酷跑录像工作台';
   static const designSize = Size(375, 812);
 
   static void configure({

lib/core/platform/app_platform_info.dart

@@ -60,7 +60,7 @@ class AppPlatformInfo {
   AppPlatformInfo._();
 
   static const MethodChannel _channel = MethodChannel(
-    'com.dronex.rec/platform_info',
+    'app.record_tool/platform_info',
   );
 
   static Future<AppPackageInfo> packageInfo() async {

lib/features/recording/model/model_recording_session.dart

@@ -7,6 +7,7 @@ class RecordingSessionState {
     this.isTouchLocked = true,
     this.isPreviewReady = false,
     this.isStartingRecording = false,
+    this.isSwitchingLens = false,
     this.hasDndAccess = false,
     this.isBatteryOptimizedIgnored = true,
     this.notificationsGranted = true,
@@ -19,12 +20,14 @@ class RecordingSessionState {
     this.errorMessage,
     this.permissionWarning,
     this.fileSaveFailed = false,
+    this.segmentOutputPaths = const [],
   });
 
   final RecordingStatus status;
   final bool isTouchLocked;
   final bool isPreviewReady;
   final bool isStartingRecording;
+  final bool isSwitchingLens;
   final bool hasDndAccess;
   final bool isBatteryOptimizedIgnored;
   final bool notificationsGranted;
@@ -37,6 +40,7 @@ class RecordingSessionState {
   final String? errorMessage;
   final String? permissionWarning;
   final bool fileSaveFailed;
+  final List<String> segmentOutputPaths;
 
   bool get isRecording => status.isRecording;
 
@@ -53,6 +57,7 @@ class RecordingSessionState {
     bool? isTouchLocked,
     bool? isPreviewReady,
     bool? isStartingRecording,
+    bool? isSwitchingLens,
     bool? hasDndAccess,
     bool? isBatteryOptimizedIgnored,
     bool? notificationsGranted,
@@ -65,6 +70,7 @@ class RecordingSessionState {
     String? errorMessage,
     String? permissionWarning,
     bool? fileSaveFailed,
+    List<String>? segmentOutputPaths,
     bool clearPermissionWarning = false,
     bool clearLastSaved = false,
   }) {
@@ -73,6 +79,7 @@ class RecordingSessionState {
       isTouchLocked: isTouchLocked ?? this.isTouchLocked,
       isPreviewReady: isPreviewReady ?? this.isPreviewReady,
       isStartingRecording: isStartingRecording ?? this.isStartingRecording,
+      isSwitchingLens: isSwitchingLens ?? this.isSwitchingLens,
       hasDndAccess: hasDndAccess ?? this.hasDndAccess,
       isBatteryOptimizedIgnored:
           isBatteryOptimizedIgnored ?? this.isBatteryOptimizedIgnored,
@@ -90,6 +97,7 @@ class RecordingSessionState {
           ? null
           : (permissionWarning ?? this.permissionWarning),
       fileSaveFailed: fileSaveFailed ?? this.fileSaveFailed,
+      segmentOutputPaths: segmentOutputPaths ?? this.segmentOutputPaths,
     );
   }
 }

lib/features/recording/pages/page_record.dart

@@ -173,7 +173,11 @@ class _RecordingPageState extends ConsumerState<RecordingPage> {
     if (!mounted) return;
     final latest = ref.read(recordingViewModelProvider).session;
     if (latest.fileSaveFailed) {
-      AppToast.show(latest.errorMessage ?? '保存到文件夹失败，请检查文件保存权限');
+      if (latest.segmentOutputPaths.isNotEmpty) {
+        AppToast.show('视频合并失败，已为你保存分段文件，可在相册中查看');
+      } else {
+        AppToast.show(latest.errorMessage ?? '保存到文件夹失败，请检查文件保存权限');
+      }
       return;
     }
     await _showRecordingSavedDialogIfNeeded();
@@ -374,6 +378,7 @@ class _RecordingHudLayer extends ConsumerWidget {
           m.session.notificationsGranted,
           m.session.isRecording,
           m.session.isStartingRecording,
+          m.session.isSwitchingLens,
           m.session.isTouchLocked,
           m.session.zoomRatio,
           m.session.minZoomRatio,
@@ -391,6 +396,7 @@ class _RecordingHudLayer extends ConsumerWidget {
       notificationsGranted,
       isRecording,
       isStartingRecording,
+      isSwitchingLens,
       isTouchLocked,
       zoomRatio,
       minZoomRatio,
@@ -408,6 +414,7 @@ class _RecordingHudLayer extends ConsumerWidget {
       notificationsGranted: notificationsGranted,
       isRecording: isRecording,
       isStartingRecording: isStartingRecording,
+      isSwitchingLens: isSwitchingLens,
       isTouchLocked: isTouchLocked,
       zoomRatio: zoomRatio,
       minZoomRatio: minZoomRatio,

lib/features/recording/platform/recording_channel_names.dart

@@ -1,5 +1,5 @@
 abstract final class RecordingChannelNames {
-  static const packageName = 'com.dronex.rec';
-  static const method = '$packageName/recording';
-  static const events = '$packageName/recording_events';
+  static const namespace = 'app.record_tool';
+  static const method = '$namespace/recording';
+  static const events = '$namespace/recording_events';
 }

lib/features/recording/platform/recording_platform.dart

@@ -207,12 +207,14 @@ class RecordingStopResult {
     required this.status,
     this.fileSaved = true,
     this.fileErrorMessage,
+    this.segmentOutputPaths = const [],
   });
 
   final String? outputPath;
   final RecordingStatus status;
   final bool fileSaved;
   final String? fileErrorMessage;
+  final List<String> segmentOutputPaths;
 
   factory RecordingStopResult.fromMap(Map<String, dynamic>? result) {
     return RecordingStopResult(
@@ -222,6 +224,11 @@ class RecordingStopResult {
       ),
       fileSaved: result?['fileSaved'] as bool? ?? true,
       fileErrorMessage: result?['fileErrorMessage'] as String?,
+      segmentOutputPaths:
+          (result?['segmentOutputPaths'] as List?)?.whereType<String>().toList(
+            growable: false,
+          ) ??
+          const [],
     );
   }
 }

lib/features/recording/view-model/view_model_recording.dart

@@ -41,10 +41,10 @@ List<Permission> recordingFileSavePermissionsForHost({
     return const [];
   }
   if (isAndroid) {
-    if (androidSdkInt != null && androidSdkInt >= 29) {
-      return const [];
+    if (androidSdkInt != null && androidSdkInt <= 28) {
+      return [Permission.storage];
     }
-    return [Permission.storage];
+    return const [];
   }
   return const [];
 }
@@ -349,10 +349,14 @@ class RecordingViewModel extends Notifier<RecordingModel> {
   /// 设置相机倍距，原生层会返回设备实际应用后的倍距范围与当前值。
   Future<void> setZoomRatio(double ratio) async {
     final session = state.session;
+    if (session.isSwitchingLens) {
+      return;
+    }
     final clamped = ratio
         .clamp(session.minZoomRatio, session.maxZoomRatio)
         .toDouble();
 
+    _updateSession((s) => s.copyWith(isSwitchingLens: true));
     try {
       final zoom = await RecordingPlatform.setZoomRatio(clamped);
       _updateSession(
@@ -364,8 +368,13 @@ class RecordingViewModel extends Notifier<RecordingModel> {
         ),
       );
     } on PlatformException catch (error) {
+      final message = error.code == 'ZOOM_FAILED'
+          ? '切换镜头失败，请重试'
+          : (error.message ?? '相机倍距设置失败');
+      _updateSession((s) => s.copyWith(errorMessage: message));
+    } finally {
       _updateSession(
-        (s) => s.copyWith(errorMessage: error.message ?? '相机倍距设置失败'),
+        (s) => s.copyWith(isSwitchingLens: false, errorMessage: s.errorMessage),
       );
     }
   }
@@ -373,7 +382,9 @@ class RecordingViewModel extends Notifier<RecordingModel> {
   /// 开始录制，可选开启勿扰模式。
   Future<void> startRecording({bool enableDoNotDisturb = true}) async {
     final session = state.session;
-    if (session.isRecording || session.isStartingRecording) {
+    if (session.isRecording ||
+        session.isStartingRecording ||
+        session.isSwitchingLens) {
       return;
     }
     if (!session.isPreviewReady) {
@@ -400,6 +411,7 @@ class RecordingViewModel extends Notifier<RecordingModel> {
           isTouchLocked: true,
           errorMessage: null,
           fileSaveFailed: false,
+          segmentOutputPaths: const [],
           clearLastSaved: true,
         ),
       );
@@ -414,7 +426,7 @@ class RecordingViewModel extends Notifier<RecordingModel> {
 
   /// 停止录制、保存到文件夹，并恢复相机预览。
   Future<void> stopRecording() async {
-    if (!state.session.isRecording) return;
+    if (!state.session.isRecording || state.session.isSwitchingLens) return;
 
     try {
       final result = await RecordingPlatform.stopRecording();
@@ -431,6 +443,7 @@ class RecordingViewModel extends Notifier<RecordingModel> {
               ? (result.fileErrorMessage ?? '保存到文件夹失败，请检查文件保存权限')
               : null,
           fileSaveFailed: fileFailed,
+          segmentOutputPaths: result.segmentOutputPaths,
         ),
       );
     } on PlatformException catch (error) {

lib/features/recording/widgets/widget_recording_hud.dart

@@ -18,6 +18,7 @@ class RecordingHudWidget extends StatelessWidget {
     required this.notificationsGranted,
     required this.isRecording,
     required this.isStartingRecording,
+    required this.isSwitchingLens,
     required this.isTouchLocked,
     this.showClipboardHint = false,
     this.clipboardAddress = '',
@@ -39,6 +40,7 @@ class RecordingHudWidget extends StatelessWidget {
   final bool notificationsGranted;
   final bool isRecording;
   final bool isStartingRecording;
+  final bool isSwitchingLens;
   final bool isTouchLocked;
   final bool showClipboardHint;
   final String clipboardAddress;
@@ -56,7 +58,6 @@ class RecordingHudWidget extends StatelessWidget {
   static double get _recordButtonBottom => 63.r;
   static double get _overlayInfoLeft => 13.r;
   static double get _overlayInfoBottom => 10.r;
-  static const List<double> _zoomPresets = [1.0, 2.0, 3.0];
 
   @override
   Widget build(BuildContext context) {
@@ -144,12 +145,13 @@ class RecordingHudWidget extends StatelessWidget {
           ),
         Positioned(
           right: 16.r,
-          bottom: _recordButtonBottom + _recordButtonSize + 14.h,
+          bottom: 260.r,
           child: _ZoomPresetControl(
+            enabled: !isSwitchingLens,
             zoomRatio: zoomRatio,
             minZoomRatio: minZoomRatio,
             maxZoomRatio: maxZoomRatio,
-            presets: _zoomPresets,
+            presets: _zoomPresetsForRange(minZoomRatio),
             onSelected: onZoomSelected,
           ),
         ),
@@ -161,7 +163,7 @@ class RecordingHudWidget extends StatelessWidget {
             child: RecordingControlButton(
               isRecording: isRecording,
               isStartingRecording: isStartingRecording,
-              enabled: !isStartingRecording,
+              enabled: !isStartingRecording && !isSwitchingLens,
               size: _recordButtonSize,
               onTap: () {
                 if (isRecording) {
@@ -190,10 +192,15 @@ class RecordingHudWidget extends StatelessWidget {
       ],
     );
   }
+
+  List<double> _zoomPresetsForRange(double minZoomRatio) {
+    return [if (minZoomRatio < 1.0) minZoomRatio, 1.0];
+  }
 }
 
 class _ZoomPresetControl extends StatelessWidget {
   const _ZoomPresetControl({
+    required this.enabled,
     required this.zoomRatio,
     required this.minZoomRatio,
     required this.maxZoomRatio,
@@ -201,6 +208,7 @@ class _ZoomPresetControl extends StatelessWidget {
     required this.onSelected,
   });
 
+  final bool enabled;
   final double zoomRatio;
   final double minZoomRatio;
   final double maxZoomRatio;
@@ -210,9 +218,8 @@ class _ZoomPresetControl extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final availablePresets = presets
-        .where((preset) => preset >= minZoomRatio && preset <= maxZoomRatio)
+        .where(_isPresetAvailable)
         .toList(growable: false);
-
     if (availablePresets.isEmpty) {
       return const SizedBox.shrink();
     }
@@ -230,8 +237,10 @@ class _ZoomPresetControl extends StatelessWidget {
           children: [
             for (final preset in availablePresets)
               _ZoomPresetButton(
-                ratio: preset,
-                selected: (zoomRatio - preset).abs() < 0.05,
+                displayRatio: preset,
+                requestRatio: preset,
+                selected: _isPresetSelected(preset),
+                enabled: enabled,
                 onSelected: onSelected,
               ),
           ],
@@ -239,17 +248,35 @@ class _ZoomPresetControl extends StatelessWidget {
       ),
     );
   }
+
+  bool _isPresetAvailable(double preset) {
+    if (preset < 1.0) {
+      return minZoomRatio <= preset && maxZoomRatio >= preset;
+    }
+    return preset >= minZoomRatio && preset <= maxZoomRatio;
+  }
+
+  bool _isPresetSelected(double preset) {
+    if (preset < 1.0) {
+      return zoomRatio < 1.0;
+    }
+    return (zoomRatio - preset).abs() < 0.05;
+  }
 }
 
 class _ZoomPresetButton extends StatelessWidget {
   const _ZoomPresetButton({
-    required this.ratio,
+    required this.displayRatio,
+    required this.requestRatio,
     required this.selected,
+    required this.enabled,
     required this.onSelected,
   });
 
-  final double ratio;
+  final double displayRatio;
+  final double requestRatio;
   final bool selected;
+  final bool enabled;
   final ValueChanged<double> onSelected;
 
   @override
@@ -257,7 +284,17 @@ class _ZoomPresetButton extends StatelessWidget {
     return Padding(
       padding: EdgeInsets.symmetric(horizontal: 1.r),
       child: TextButton(
-        onPressed: selected ? null : () => onSelected(ratio),
+        onPressed: selected || !enabled
+            ? null
+            : () => RateLimit.instance.debounce<void>(
+                key:
+                    'recording.session.zoom.${requestRatio.toStringAsFixed(1)}',
+                value: null,
+                duration: Duration(milliseconds: 300),
+                onCallback: (_) async {
+                  onSelected(requestRatio);
+                },
+              ),
         style: TextButton.styleFrom(
           minimumSize: Size(38.r, 32.r),
           padding: EdgeInsets.zero,
@@ -271,7 +308,7 @@ class _ZoomPresetButton extends StatelessWidget {
           ),
         ),
         child: Text(
-          '${ratio.toStringAsFixed(0)}x',
+          _formatZoomRatio(displayRatio),
           style: TextStyle(
             fontSize: 13.sp,
             fontWeight: FontWeight.w700,
@@ -281,4 +318,14 @@ class _ZoomPresetButton extends StatelessWidget {
       ),
     );
   }
+
+  String _formatZoomRatio(double ratio) {
+    if (ratio < 1.0) {
+      return '广角';
+    }
+    if (ratio == ratio.roundToDouble()) {
+      return '${ratio.toStringAsFixed(0)}x';
+    }
+    return '${ratio.toStringAsFixed(1)}x';
+  }
 }

test/features/recording/recording_platform_test.dart

@@ -1,7 +1,15 @@
 import 'package:flutter_test/flutter_test.dart';
+import 'package:recording_tool/features/recording/platform/recording_channel_names.dart';
 import 'package:recording_tool/features/recording/platform/recording_platform.dart';
 
 void main() {
+  group('RecordingChannelNames', () {
+    test('uses stable bridge names without package binding', () {
+      expect(RecordingChannelNames.method, 'app.record_tool/recording');
+      expect(RecordingChannelNames.events, 'app.record_tool/recording_events');
+    });
+  });
+
   group('RecordingPlatform support', () {
     test('supports Android and iOS hosts only', () {
       expect(

test/features/recording/view_model_recording_test.dart

@@ -1,8 +1,12 @@
+import 'dart:async';
+
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:permission_handler/permission_handler.dart';
+import 'package:recording_tool/features/recording/model/model_recording_session.dart';
 import 'package:recording_tool/features/recording/platform/recording_channel_names.dart';
+import 'package:recording_tool/features/recording/platform/recording_platform.dart';
 import 'package:recording_tool/features/recording/view-model/view_model_recording.dart';
 
 void main() {
@@ -75,6 +79,80 @@ void main() {
       expect(session.errorMessage, isNull);
     });
 
+    test('passes 0.5x to native when camera capabilities allow it', () async {
+      final calls = <MethodCall>[];
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(
+            const MethodChannel(RecordingChannelNames.method),
+            (call) async {
+              calls.add(call);
+              return <String, dynamic>{
+                'zoomRatio': 0.5,
+                'minZoomRatio': 0.5,
+                'maxZoomRatio': 3.0,
+              };
+            },
+          );
+      final container = ProviderContainer();
+      addTearDown(container.dispose);
+      final notifier = container.read(recordingViewModelProvider.notifier);
+      // ignore: invalid_use_of_protected_member
+      notifier.state = container
+          .read(recordingViewModelProvider)
+          .copyWith(
+            session: const RecordingSessionState(
+              zoomRatio: 1.0,
+              minZoomRatio: 0.5,
+              maxZoomRatio: 3.0,
+            ),
+          );
+
+      await notifier.setZoomRatio(0.5);
+
+      expect(calls.single.arguments, <String, dynamic>{'zoomRatio': 0.5});
+      final session = container.read(recordingViewModelProvider).session;
+      expect(session.zoomRatio, 0.5);
+      expect(session.minZoomRatio, 0.5);
+      expect(session.maxZoomRatio, 3.0);
+    });
+
+    test('passes 0.6x to native when camera capabilities allow it', () async {
+      final calls = <MethodCall>[];
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(
+            const MethodChannel(RecordingChannelNames.method),
+            (call) async {
+              calls.add(call);
+              return <String, dynamic>{
+                'zoomRatio': 0.6,
+                'minZoomRatio': 0.6,
+                'maxZoomRatio': 3.0,
+              };
+            },
+          );
+      final container = ProviderContainer();
+      addTearDown(container.dispose);
+      final notifier = container.read(recordingViewModelProvider.notifier);
+      // ignore: invalid_use_of_protected_member
+      notifier.state = container
+          .read(recordingViewModelProvider)
+          .copyWith(
+            session: const RecordingSessionState(
+              zoomRatio: 1.0,
+              minZoomRatio: 0.6,
+              maxZoomRatio: 3.0,
+            ),
+          );
+
+      await notifier.setZoomRatio(0.6);
+
+      expect(calls.single.arguments, <String, dynamic>{'zoomRatio': 0.6});
+      final session = container.read(recordingViewModelProvider).session;
+      expect(session.zoomRatio, 0.6);
+      expect(session.minZoomRatio, 0.6);
+      expect(session.maxZoomRatio, 3.0);
+    });
+
     test('clamps requested zoom ratio before invoking native', () async {
       final calls = <MethodCall>[];
       TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
@@ -98,6 +176,37 @@ void main() {
       expect(container.read(recordingViewModelProvider).session.zoomRatio, 1.0);
     });
 
+    test(
+      'clamps 0.6x to 1x when camera capabilities do not allow it',
+      () async {
+        final calls = <MethodCall>[];
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(
+              const MethodChannel(RecordingChannelNames.method),
+              (call) async {
+                calls.add(call);
+                return <String, dynamic>{
+                  'zoomRatio': 1.0,
+                  'minZoomRatio': 1.0,
+                  'maxZoomRatio': 3.0,
+                };
+              },
+            );
+        final container = ProviderContainer();
+        addTearDown(container.dispose);
+
+        await container
+            .read(recordingViewModelProvider.notifier)
+            .setZoomRatio(0.6);
+
+        expect(calls.single.arguments, <String, dynamic>{'zoomRatio': 1.0});
+        expect(
+          container.read(recordingViewModelProvider).session.zoomRatio,
+          1.0,
+        );
+      },
+    );
+
     test(
       'keeps previous zoom ratio and stores error when native fails',
       () async {
@@ -120,7 +229,152 @@ void main() {
 
         final session = container.read(recordingViewModelProvider).session;
         expect(session.zoomRatio, 1.0);
-        expect(session.errorMessage, 'Zoom is unavailable');
+        expect(session.errorMessage, '切换镜头失败，请重试');
+      },
+    );
+
+    test(
+      'maps native zoom failure to user friendly lens switch message',
+      () async {
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(
+              const MethodChannel(RecordingChannelNames.method),
+              (call) async {
+                throw PlatformException(
+                  code: 'ZOOM_FAILED',
+                  message: 'Cannot switch physical camera while recording',
+                );
+              },
+            );
+        final container = ProviderContainer();
+        addTearDown(container.dispose);
+
+        await container
+            .read(recordingViewModelProvider.notifier)
+            .setZoomRatio(0.6);
+
+        final session = container.read(recordingViewModelProvider).session;
+        expect(session.zoomRatio, 1.0);
+        expect(session.errorMessage, '切换镜头失败，请重试');
+      },
+    );
+
+    test('sets switching lens while native zoom request is pending', () async {
+      final completer = Completer<Map<String, dynamic>>();
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(
+            const MethodChannel(RecordingChannelNames.method),
+            (call) => completer.future,
+          );
+      final container = ProviderContainer();
+      addTearDown(container.dispose);
+      final notifier = container.read(recordingViewModelProvider.notifier);
+
+      final future = notifier.setZoomRatio(2);
+      await Future<void>.delayed(Duration.zero);
+
+      expect(
+        container.read(recordingViewModelProvider).session.isSwitchingLens,
+        isTrue,
+      );
+
+      completer.complete(<String, dynamic>{
+        'zoomRatio': 2.0,
+        'minZoomRatio': 1.0,
+        'maxZoomRatio': 3.0,
+      });
+      await future;
+
+      expect(
+        container.read(recordingViewModelProvider).session.isSwitchingLens,
+        isFalse,
+      );
+    });
+  });
+
+  group('RecordingViewModel.stopRecording', () {
+    test('does not call native stop while switching lens', () async {
+      final calls = <MethodCall>[];
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(
+            const MethodChannel(RecordingChannelNames.method),
+            (call) async {
+              calls.add(call);
+              return <String, dynamic>{};
+            },
+          );
+      final container = ProviderContainer();
+      addTearDown(container.dispose);
+      final notifier = container.read(recordingViewModelProvider.notifier);
+      // ignore: invalid_use_of_protected_member
+      notifier.state = container
+          .read(recordingViewModelProvider)
+          .copyWith(
+            session: const RecordingSessionState(
+              status: RecordingStatus(state: RecordingState.recording),
+              isSwitchingLens: true,
+            ),
+          );
+
+      await notifier.stopRecording();
+
+      expect(calls, isEmpty);
+    });
+
+    test(
+      'stores segment output paths when native save falls back to parts',
+      () async {
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(
+              const MethodChannel(RecordingChannelNames.method),
+              (call) async {
+                switch (call.method) {
+                  case 'stopRecording':
+                    return <String, dynamic>{
+                      'outputPath': 'content://recordings/part1',
+                      'status': <String, dynamic>{
+                        'state': 'error',
+                        'message': 'Merge failed',
+                      },
+                      'fileSaved': false,
+                      'fileErrorMessage': 'Merge failed',
+                      'segmentOutputPaths': <String>[
+                        'content://recordings/part1',
+                        'content://recordings/part2',
+                      ],
+                    };
+                  case 'initializePreview':
+                    return <String, dynamic>{'state': 'previewing'};
+                  case 'getZoomCapabilities':
+                    return <String, dynamic>{
+                      'zoomRatio': 1.0,
+                      'minZoomRatio': 1.0,
+                      'maxZoomRatio': 3.0,
+                    };
+                }
+                return <String, dynamic>{};
+              },
+            );
+        final container = ProviderContainer();
+        addTearDown(container.dispose);
+        final notifier = container.read(recordingViewModelProvider.notifier);
+        // ignore: invalid_use_of_protected_member
+        notifier.state = container
+            .read(recordingViewModelProvider)
+            .copyWith(
+              session: const RecordingSessionState(
+                status: RecordingStatus(state: RecordingState.recording),
+              ),
+            );
+
+        await notifier.stopRecording();
+
+        final session = container.read(recordingViewModelProvider).session;
+        expect(session.fileSaveFailed, isTrue);
+        expect(session.segmentOutputPaths, <String>[
+          'content://recordings/part1',
+          'content://recordings/part2',
+        ]);
       },
     );
   });
@@ -157,6 +411,25 @@ void main() {
 
       expect(permissions, isEmpty);
     });
+
+    test('does not request file save permission on Android 13 and above', () {
+      final permissions = recordingFileSavePermissionsForHost(
+        isIOS: false,
+        isAndroid: true,
+        androidSdkInt: 33,
+      );
+
+      expect(permissions, isEmpty);
+    });
+
+    test('does not request file save permission when Android SDK is unknown', () {
+      final permissions = recordingFileSavePermissionsForHost(
+        isIOS: false,
+        isAndroid: true,
+      );
+
+      expect(permissions, isEmpty);
+    });
   });
 
   group('RecordingViewModel.getClipboardContent', () {

test/features/recording/widget_recording_hud_test.dart

@@ -9,6 +9,9 @@ void main() {
     double zoomRatio = 1.0,
     double minZoomRatio = 1.0,
     double maxZoomRatio = 3.0,
+    bool isRecording = false,
+    bool isSwitchingLens = false,
+    Future<void> Function()? onStop,
     ValueChanged<double>? onZoomSelected,
   }) async {
     await tester.pumpWidget(
@@ -22,14 +25,15 @@ void main() {
                 hasDndAccess: true,
                 isBatteryOptimizedIgnored: true,
                 notificationsGranted: true,
-                isRecording: false,
+                isRecording: isRecording,
                 isStartingRecording: false,
+                isSwitchingLens: isSwitchingLens,
                 isTouchLocked: false,
                 zoomRatio: zoomRatio,
                 minZoomRatio: minZoomRatio,
                 maxZoomRatio: maxZoomRatio,
                 onStart: () async {},
-                onStop: () async {},
+                onStop: onStop ?? () async {},
                 onOpenDnd: () {},
                 onOpenBattery: () {},
                 onToggleTouchLock: () {},
@@ -46,35 +50,181 @@ void main() {
   testWidgets('shows preset zoom buttons', (tester) async {
     await pumpHud(tester);
 
+    expect(find.text('0.5x'), findsNothing);
+    expect(find.text('0.6x'), findsNothing);
     expect(find.text('1x'), findsOneWidget);
-    expect(find.text('2x'), findsOneWidget);
-    expect(find.text('3x'), findsOneWidget);
+    expect(find.text('2x'), findsNothing);
+    expect(find.text('3x'), findsNothing);
   });
 
-  testWidgets('marks current zoom ratio as selected', (tester) async {
-    await pumpHud(tester, zoomRatio: 2.0);
+  testWidgets('shows 0.5x when ultra-wide camera capability is 0.5', (
+    tester,
+  ) async {
+    await pumpHud(tester, minZoomRatio: 0.5);
+
+    expect(find.text('0.5x'), findsOneWidget);
+    expect(find.text('0.6x'), findsNothing);
+    expect(find.text('1x'), findsOneWidget);
+    expect(find.text('2x'), findsNothing);
+    expect(find.text('3x'), findsNothing);
+  });
+
+  testWidgets('shows 0.6x when 0.6x camera capability supports it', (
+    tester,
+  ) async {
+    await pumpHud(tester, minZoomRatio: 0.6);
+
+    expect(find.text('0.6x'), findsOneWidget);
+    expect(find.text('1x'), findsOneWidget);
+  });
+
+  testWidgets('marks current 0.5x zoom ratio as selected', (tester) async {
+    await pumpHud(tester, zoomRatio: 0.5, minZoomRatio: 0.5);
 
     final selectedButton = tester.widget<TextButton>(
-      find.ancestor(of: find.text('2x'), matching: find.byType(TextButton)),
+      find.ancestor(of: find.text('0.5x'), matching: find.byType(TextButton)),
+    );
+    expect(selectedButton.enabled, isFalse);
+  });
+
+  testWidgets('marks current 0.6x zoom ratio as selected', (tester) async {
+    await pumpHud(tester, zoomRatio: 0.6, minZoomRatio: 0.6);
+
+    final selectedButton = tester.widget<TextButton>(
+      find.ancestor(of: find.text('0.6x'), matching: find.byType(TextButton)),
     );
     expect(selectedButton.enabled, isFalse);
   });
 
   testWidgets('does not expose presets beyond max zoom ratio', (tester) async {
-    await pumpHud(tester, maxZoomRatio: 2.0);
+    await pumpHud(tester, minZoomRatio: 0.5, maxZoomRatio: 0.55);
 
-    expect(find.text('1x'), findsOneWidget);
-    expect(find.text('2x'), findsOneWidget);
-    expect(find.text('3x'), findsNothing);
+    expect(find.text('0.5x'), findsOneWidget);
+    expect(find.text('0.6x'), findsNothing);
+    expect(find.text('1x'), findsNothing);
   });
 
-  testWidgets('tapping zoom preset reports selected ratio', (tester) async {
+  testWidgets('tapping 0.5x reports 0.5 when camera capability is 0.5', (
+    tester,
+  ) async {
     double? selected;
-    await pumpHud(tester, onZoomSelected: (ratio) => selected = ratio);
+    await pumpHud(
+      tester,
+      minZoomRatio: 0.5,
+      onZoomSelected: (ratio) => selected = ratio,
+    );
 
-    await tester.tap(find.text('2x'));
+    await tester.tap(find.text('0.5x'));
+    await tester.pump(const Duration(milliseconds: 350));
+
+    expect(selected, 0.5);
+  });
+
+  testWidgets('tapping 0.6x reports 0.6 when camera only supports 0.6x', (
+    tester,
+  ) async {
+    double? selected;
+    await pumpHud(
+      tester,
+      minZoomRatio: 0.6,
+      onZoomSelected: (ratio) => selected = ratio,
+    );
+
+    await tester.tap(find.text('0.6x'));
+    await tester.pump(const Duration(milliseconds: 350));
+
+    expect(selected, 0.6);
+  });
+
+  testWidgets('allows 0.6x while recording on main camera after unlock', (
+    tester,
+  ) async {
+    double? selected;
+    await pumpHud(
+      tester,
+      minZoomRatio: 0.6,
+      isRecording: true,
+      onZoomSelected: (ratio) => selected = ratio,
+    );
+
+    final ultraWideButton = tester.widget<TextButton>(
+      find.ancestor(of: find.text('0.6x'), matching: find.byType(TextButton)),
+    );
+    final mainButton = tester.widget<TextButton>(
+      find.ancestor(of: find.text('1x'), matching: find.byType(TextButton)),
+    );
+
+    expect(ultraWideButton.enabled, isTrue);
+    expect(mainButton.enabled, isFalse);
+
+    await tester.tap(find.text('0.6x'));
+    await tester.pump(const Duration(milliseconds: 350));
+
+    expect(selected, 0.6);
+  });
+
+  testWidgets('allows 1x while recording on ultra-wide after unlock', (
+    tester,
+  ) async {
+    double? selected;
+    await pumpHud(
+      tester,
+      zoomRatio: 0.5,
+      minZoomRatio: 0.5,
+      isRecording: true,
+      onZoomSelected: (ratio) => selected = ratio,
+    );
+
+    final ultraWideButton = tester.widget<TextButton>(
+      find.ancestor(of: find.text('0.5x'), matching: find.byType(TextButton)),
+    );
+    final mainButton = tester.widget<TextButton>(
+      find.ancestor(of: find.text('1x'), matching: find.byType(TextButton)),
+    );
+
+    expect(ultraWideButton.enabled, isFalse);
+    expect(mainButton.enabled, isTrue);
+
+    await tester.tap(find.text('1x'));
+    await tester.pump(const Duration(milliseconds: 350));
+
+    expect(selected, 1.0);
+  });
+
+  testWidgets('disables stop button while switching lens', (tester) async {
+    var stopped = false;
+    await pumpHud(
+      tester,
+      minZoomRatio: 0.6,
+      isRecording: true,
+      isSwitchingLens: true,
+      onStop: () async => stopped = true,
+    );
+
+    await tester.tap(find.byType(GestureDetector).last);
     await tester.pump();
 
-    expect(selected, 2.0);
+    expect(stopped, isFalse);
+  });
+
+  testWidgets('disables zoom buttons while switching lens', (tester) async {
+    double? selected;
+    await pumpHud(
+      tester,
+      minZoomRatio: 0.6,
+      isRecording: true,
+      isSwitchingLens: true,
+      onZoomSelected: (ratio) => selected = ratio,
+    );
+
+    final ultraWideButton = tester.widget<TextButton>(
+      find.ancestor(of: find.text('0.6x'), matching: find.byType(TextButton)),
+    );
+
+    expect(ultraWideButton.enabled, isFalse);
+    await tester.tap(find.text('0.6x'));
+    await tester.pump(const Duration(milliseconds: 350));
+
+    expect(selected, isNull);
   });
 }