Merge branch 'linfeng/run/dev/20260630' into linfeng/drone/dev/2026630

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

@@ -19,6 +19,7 @@ pubspec.lock
 *.iws
 .idea/
 .cursor
+Podfile.lock
 
 # The .vscode folder contains launch configuration and tasks you configure in
 # VS Code which you may wish to be included in version control, so this line
@@ -47,3 +48,4 @@ app.*.map.json
 /android/app/release
 /android/.kotlin
 
+CLAUDE.md

android/app/src/main/AndroidManifest.xml

@@ -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" />
@@ -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 +1,10 @@
 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 = "$PACKAGE_NAME.recording.STOP"
+    private const val CHANNEL_NAMESPACE = "app.record_tool"
+    const val PLATFORM_INFO_CHANNEL = "$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/dronex/rec/MainActivity.kt

@@ -114,6 +114,7 @@ class MainActivity : FlutterActivity() {
                 "brand" to Build.BRAND,
                 "model" to Build.MODEL,
                 "systemVersion" to Build.VERSION.RELEASE,
+                "sdkInt" to Build.VERSION.SDK_INT,
                 "isPhysicalDevice" to !isEmulator,
         )
     }

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

@@ -4,7 +4,9 @@ import android.content.ContentValues
 import android.content.Context
 import android.os.Build
 import android.provider.MediaStore
-import androidx.camera.video.MediaStoreOutputOptions
+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
@@ -13,10 +15,37 @@ 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(
+    fun buildSegmentOutputOptions(segmentFile: File): FileOutputOptions {
+        return FileOutputOptions.Builder(segmentFile).build()
+    }
+
+    fun createSegmentFile(
             context: Context,
             displayName: String?,
-    ): MediaStoreOutputOptions {
+            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 {
@@ -24,15 +53,42 @@ object RecordingOutputFactory {
                     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)
                     }
                 }
 
-        return MediaStoreOutputOptions.Builder(
-                        context.contentResolver,
-                        MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
-                )
-                .setContentValues(contentValues)
-                .build()
+        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 {

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

@@ -50,6 +50,11 @@ class RecordingPlatformHandler(
                 startRecording(withAudio, enableDnd, displayName, result)
             }
             "stopRecording" -> stopRecording(result)
+            "getZoomCapabilities" -> result.success(controller.zoomCapabilitiesMap())
+            "setZoomRatio" -> {
+                val ratio = call.argument<Double>("zoomRatio") ?: 1.0
+                setZoomRatio(ratio, result)
+            }
             "disposePreview" -> {
                 controller.unbind()
                 result.success(null)
@@ -172,16 +177,29 @@ class RecordingPlatformHandler(
         }
     }
 
+    private fun setZoomRatio(ratio: Double, result: MethodChannel.Result) {
+        controller.setZoomRatio(ratio) { success, capabilities, message ->
+            mainHandler.post {
+                if (success) {
+                    result.success(capabilities)
+                } else {
+                    result.error("ZOOM_FAILED", message ?: "Failed to set camera zoom", null)
+                }
+            }
+        }
+    }
+
     private fun deliverStopResult(result: MethodChannel.Result, path: String?) {
-        val gallerySaved = path != null && controller.status.state != RecordingState.ERROR
+        val fileSaved = path != null && controller.status.state != RecordingState.ERROR
         val payload =
                 mutableMapOf<String, Any?>(
                         "outputPath" to path,
                         "status" to controller.status.toMap(),
-                        "gallerySaved" to gallerySaved,
+                        "fileSaved" to fileSaved,
+                        "segmentOutputPaths" to controller.segmentOutputPaths(),
                 )
-        if (!gallerySaved) {
-            payload["galleryErrorMessage"] = controller.status.message ?: "保存到相册失败"
+        if (!fileSaved) {
+            payload["fileErrorMessage"] = controller.status.message ?: "保存到文件夹失败"
         }
         result.success(payload)
     }

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

@@ -0,0 +1,174 @@
+package com.dronex.rec.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()
+    }
+}

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"
+}

clean.sh

@@ -0,0 +1,7 @@
+flutter clean  
+flutter pub get
+rm -rf ios/Pods
+rm -rf ios/Podfile.lock
+cd ios
+pod install
+cd ..

ios/Flutter/Debug.xcconfig

@@ -1,2 +1,3 @@
 #include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
 #include "Generated.xcconfig"
+FRAMEWORK_SEARCH_PATHS = $(inherited) "${PODS_CONFIGURATION_BUILD_DIR}"

ios/Flutter/Release.xcconfig

@@ -1,2 +1,3 @@
 #include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
 #include "Generated.xcconfig"
+FRAMEWORK_SEARCH_PATHS = $(inherited) "${PODS_CONFIGURATION_BUILD_DIR}"

ios/Podfile

@@ -45,9 +45,34 @@ post_install do |installer|
         '$(inherited)',
         'PERMISSION_CAMERA=1',
         'PERMISSION_MICROPHONE=1',
-        'PERMISSION_PHOTOS=1',
-        'PERMISSION_PHOTOS_ADD_ONLY=1',
       ]
     end
   end
+
+  pods_runner_dir = File.join(
+    installer.sandbox.root,
+    'Target Support Files',
+    'Pods-Runner'
+  )
+  Dir.glob(File.join(pods_runner_dir, 'Pods-Runner.*.xcconfig')).each do |config_path|
+    config = File.read(config_path)
+    config.gsub!(
+      'FRAMEWORK_SEARCH_PATHS = $(inherited)',
+      'FRAMEWORK_SEARCH_PATHS = $(inherited) "${PODS_CONFIGURATION_BUILD_DIR}"'
+    )
+    File.write(config_path, config)
+  end
+
+  Dir.glob(File.join(pods_runner_dir, 'Pods-Runner-frameworks-*input-files.xcfilelist')).each do |file_list_path|
+    file_list = File.read(file_list_path)
+    file_list.gsub!('${BUILT_PRODUCTS_DIR}/', '${PODS_CONFIGURATION_BUILD_DIR}/')
+    File.write(file_list_path, file_list)
+  end
+
+  frameworks_script = File.join(pods_runner_dir, 'Pods-Runner-frameworks.sh')
+  if File.exist?(frameworks_script)
+    script = File.read(frameworks_script)
+    script.gsub!('${BUILT_PRODUCTS_DIR}/', '${PODS_CONFIGURATION_BUILD_DIR}/')
+    File.write(frameworks_script, script)
+  end
 end

ios/Podfile.lock

@@ -43,6 +43,6 @@ SPEC CHECKSUMS:
   sqflite_darwin: 20b2a3a3b70e43edae938624ce550a3cbf66a3d0
   url_launcher_ios: 7a95fa5b60cc718a708b8f2966718e93db0cef1b
 
-PODFILE CHECKSUM: 5a82b772179df87e6518bddc6f9bb8b4053ce48b
+PODFILE CHECKSUM: 858401fbd980bedce6ecd2f9b429bf271f11f74b
 
 COCOAPODS: 1.16.2

ios/Runner.xcodeproj/project.pbxproj

@@ -344,14 +344,10 @@
 			inputFileListPaths = (
 				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-input-files.xcfilelist",
 			);
-			inputPaths = (
-			);
 			name = "[CP] Embed Pods Frameworks";
 			outputFileListPaths = (
 				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-output-files.xcfilelist",
 			);
-			outputPaths = (
-			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
 			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
@@ -380,14 +376,10 @@
 			inputFileListPaths = (
 				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-resources-${CONFIGURATION}-input-files.xcfilelist",
 			);
-			inputPaths = (
-			);
 			name = "[CP] Copy Pods Resources";
 			outputFileListPaths = (
 				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-resources-${CONFIGURATION}-output-files.xcfilelist",
 			);
-			outputPaths = (
-			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
 			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-resources.sh\"\n";

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

@@ -0,0 +1,13 @@
+{
+  "images" : [
+    {
+      "filename" : "startup_background.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -16,13 +16,15 @@
                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" image="StartupBackground" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
                             </imageView>
                         </subviews>
                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <constraints>
-                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
-                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="top" secondItem="Ze5-6b-2t3" secondAttribute="top" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="bottom" secondItem="Ze5-6b-2t3" secondAttribute="bottom" id="4X2-HB-R7a"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="leading" secondItem="Ze5-6b-2t3" secondAttribute="leading" id="E8f-e3-JEx"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="trailing" secondItem="Ze5-6b-2t3" secondAttribute="trailing" id="rwG-Bh-0uU"/>
                         </constraints>
                     </view>
                 </viewController>
@@ -32,6 +34,6 @@
         </scene>
     </scenes>
     <resources>
-        <image name="LaunchImage" width="168" height="185"/>
+        <image name="StartupBackground" width="750" height="1624"/>
     </resources>
 </document>

ios/Runner/Base.lproj/Main.storyboard

@@ -18,7 +18,18 @@
                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
                         <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" image="StartupBackground" translatesAutoresizingMaskIntoConstraints="NO" id="YQm-Ov-qw7">
+                                <rect key="frame" x="0.0" y="0.0" width="393" height="852"/>
+                            </imageView>
+                        </subviews>
                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YQm-Ov-qw7" firstAttribute="top" secondItem="8bC-Xf-vdC" secondAttribute="top" id="7pp-OK-Dgk"/>
+                            <constraint firstItem="YQm-Ov-qw7" firstAttribute="bottom" secondItem="8bC-Xf-vdC" secondAttribute="bottom" id="Hbf-gY-rbf"/>
+                            <constraint firstItem="YQm-Ov-qw7" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leading" id="WPc-7k-20p"/>
+                            <constraint firstItem="YQm-Ov-qw7" firstAttribute="trailing" secondItem="8bC-Xf-vdC" secondAttribute="trailing" id="w1G-WA-3QR"/>
+                        </constraints>
                     </view>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
@@ -26,4 +37,7 @@
             <point key="canvasLocation" x="139" y="122"/>
         </scene>
     </scenes>
+    <resources>
+        <image name="StartupBackground" width="750" height="1624"/>
+    </resources>
 </document>

ios/Runner/Info.plist

@@ -30,8 +30,10 @@
 	<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>NSPhotoLibraryAddUsageDescription</key>
-	<string>需要将录制的视频保存到相册。</string>
+	<key>UIFileSharingEnabled</key>
+	<true/>
+	<key>LSSupportsOpeningDocumentsInPlace</key>
+	<true/>
 	<key>UIApplicationSceneManifest</key>
 	<dict>
 		<key>UIApplicationSupportsMultipleScenes</key>

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

@@ -1,6 +1,5 @@
 import AVFoundation
 import Flutter
-import Photos
 import UIKit
 
 private enum RecordingState: String {
@@ -110,12 +109,13 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
   private var audioInput: AVCaptureDeviceInput?
   private var configured = false
   private var latestOutputPath: String?
-  private var latestGallerySaved = true
-  private var latestGalleryErrorMessage: String?
+  private var latestFileSaved = true
+  private var latestFileErrorMessage: String?
   private var pendingDisplayName: String?
   private var recordingStartedAt: Date?
   private var elapsedTimer: Timer?
   private var pendingStopResult: FlutterResult?
+  private var currentZoomRatio: CGFloat = 1.0
 
   private(set) var status = RecordingStatus(state: .idle) {
     didSet {
@@ -215,10 +215,10 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
         }
 
         self.pendingDisplayName = displayName
-        self.latestGallerySaved = true
-        self.latestGalleryErrorMessage = nil
+        self.latestFileSaved = true
+        self.latestFileErrorMessage = nil
         let outputURL = try self.createOutputURL(displayName: displayName)
-        self.latestOutputPath = outputURL.lastPathComponent
+        self.latestOutputPath = outputURL.path
         self.recordingStartedAt = Date()
         self.updateStatus(RecordingStatus(state: .recording, outputPath: outputURL.path))
         self.movieOutput.startRecording(to: outputURL, recordingDelegate: self)
@@ -254,11 +254,11 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
           var payload: [String: Any] = [
             "outputPath": self.latestOutputPath as Any,
             "status": self.currentStatusMap(),
-            "gallerySaved": self.latestGallerySaved,
+            "fileSaved": self.latestFileSaved,
           ]
-          if !self.latestGallerySaved {
-            payload["galleryErrorMessage"] =
-              self.latestGalleryErrorMessage ?? "保存到相册失败"
+          if !self.latestFileSaved {
+            payload["fileErrorMessage"] =
+              self.latestFileErrorMessage ?? "保存到文件夹失败"
           }
           result(payload)
         }
@@ -291,6 +291,7 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
       self.session.commitConfiguration()
       self.videoInput = nil
       self.audioInput = nil
+      self.currentZoomRatio = 1.0
       self.configured = false
       self.updateStatus(RecordingStatus(state: .idle))
 
@@ -312,6 +313,54 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
     return status.toMap()
   }
 
+  func zoomCapabilities(result: @escaping FlutterResult) {
+    sessionQueue.async { [weak self] in
+      guard let self else { return }
+      let capabilities = self.currentZoomCapabilitiesMap()
+      DispatchQueue.main.async {
+        result(capabilities)
+      }
+    }
+  }
+
+  func setZoomRatio(_ ratio: CGFloat, result: @escaping FlutterResult) {
+    sessionQueue.async { [weak self] in
+      guard let self else { return }
+      guard let device = self.videoInput?.device else {
+        self.currentZoomRatio = max(1.0, ratio)
+        let capabilities = self.currentZoomCapabilitiesMap()
+        DispatchQueue.main.async {
+          result(capabilities)
+        }
+        return
+      }
+
+      do {
+        // 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()
+        self.currentZoomRatio = nextZoom
+        let capabilities = self.currentZoomCapabilitiesMap()
+        DispatchQueue.main.async {
+          result(capabilities)
+        }
+      } catch {
+        DispatchQueue.main.async {
+          result(
+            FlutterError(
+              code: "ZOOM_FAILED",
+              message: error.localizedDescription,
+              details: nil
+            )
+          )
+        }
+      }
+    }
+  }
+
   func fileOutput(
     _ output: AVCaptureFileOutput,
     didFinishRecordingTo outputFileURL: URL,
@@ -322,8 +371,8 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
     pendingStopResult = nil
 
     if let error {
-      latestGallerySaved = false
-      latestGalleryErrorMessage = error.localizedDescription
+      latestFileSaved = false
+      latestFileErrorMessage = error.localizedDescription
       updateStatus(
         RecordingStatus(
           state: .error, outputPath: latestOutputPath, message: error.localizedDescription))
@@ -331,29 +380,30 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
       return
     }
 
-    saveVideoToPhotoLibrary(fileURL: outputFileURL) { [weak self] success, message in
-      guard let self else { return }
-      self.latestGallerySaved = success
-      self.latestGalleryErrorMessage = message
-      if success {
-        self.updateStatus(
-          RecordingStatus(
-            state: .previewing,
-            outputPath: self.latestOutputPath,
-            elapsedMillis: self.elapsedMillis()
-          )
+    latestFileSaved = true
+    latestFileErrorMessage = nil
+    latestOutputPath = outputFileURL.path
+    guard FileManager.default.fileExists(atPath: outputFileURL.path) else {
+      latestFileSaved = false
+      latestFileErrorMessage = "录制文件未生成"
+      updateStatus(
+        RecordingStatus(
+          state: .error,
+          outputPath: latestOutputPath,
+          message: latestFileErrorMessage
         )
-      } else {
-        self.updateStatus(
-          RecordingStatus(
-            state: .error,
-            outputPath: self.latestOutputPath,
-            message: message ?? "保存到相册失败"
-          )
-        )
-      }
-      self.finishStopRecording(stopResult: stopResult)
+      )
+      finishStopRecording(stopResult: stopResult)
+      return
     }
+    updateStatus(
+      RecordingStatus(
+        state: .previewing,
+        outputPath: latestOutputPath,
+        elapsedMillis: elapsedMillis()
+      )
+    )
+    finishStopRecording(stopResult: stopResult)
   }
 
   private func finishStopRecording(stopResult: FlutterResult?) {
@@ -363,79 +413,23 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
       var payload: [String: Any] = [
         "outputPath": self.latestOutputPath as Any,
         "status": self.currentStatusMap(),
-        "gallerySaved": self.latestGallerySaved,
+        "fileSaved": self.latestFileSaved,
       ]
-      if !self.latestGallerySaved {
-        payload["galleryErrorMessage"] =
-          self.latestGalleryErrorMessage ?? "保存到相册失败，请开启相册权限"
+      if !self.latestFileSaved {
+        payload["fileErrorMessage"] =
+          self.latestFileErrorMessage ?? "保存到文件夹失败，请检查文件保存权限"
       }
       stopResult?(payload)
     }
   }
 
-  private func saveVideoToPhotoLibrary(
-    fileURL: URL,
-    completion: @escaping (Bool, String?) -> Void
-  ) {
-    let performSave = {
-      PHPhotoLibrary.shared().performChanges({
-        PHAssetCreationRequest.forAsset().addResource(with: .video, fileURL: fileURL, options: nil)
-      }) { success, error in
-        if success {
-          try? FileManager.default.removeItem(at: fileURL)
-          completion(true, nil)
-        } else {
-          completion(false, error?.localizedDescription ?? "保存到相册失败")
-        }
-      }
-    }
-
-    if #available(iOS 14, *) {
-      let status = PHPhotoLibrary.authorizationStatus(for: .addOnly)
-      switch status {
-      case .authorized, .limited:
-        performSave()
-      case .notDetermined:
-        PHPhotoLibrary.requestAuthorization(for: .addOnly) { newStatus in
-          if newStatus == .authorized || newStatus == .limited {
-            performSave()
-          } else {
-            completion(false, "未授予相册权限")
-          }
-        }
-      default:
-        completion(false, "未授予相册权限")
-      }
-    } else {
-      let status = PHPhotoLibrary.authorizationStatus()
-      switch status {
-      case .authorized:
-        performSave()
-      case .notDetermined:
-        PHPhotoLibrary.requestAuthorization { newStatus in
-          if newStatus == .authorized {
-            performSave()
-          } else {
-            completion(false, "未授予相册权限")
-          }
-        }
-      default:
-        completion(false, "未授予相册权限")
-      }
-    }
-  }
-
   private func configureSession(withAudio: Bool) throws {
     if configured {
       try configureAudioInput(enabled: withAudio)
       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"])
@@ -465,9 +459,74 @@ 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 [
+        "zoomRatio": Double(currentZoomRatio),
+        "minZoomRatio": 1.0,
+        "maxZoomRatio": 3.0,
+      ]
+    }
+
+    // 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 / baseline),
+      "minZoomRatio": Double(minZoom / baseline),
+      "maxZoomRatio": Double(maxZoom / baseline),
+    ]
+  }
+
+  private func applyCurrentZoom() throws {
+    guard let device = videoInput?.device else { return }
+    let nextZoom = clampedZoomRatio(currentZoomRatio, for: device)
+    try device.lockForConfiguration()
+    device.videoZoomFactor = nextZoom
+    device.unlockForConfiguration()
+    currentZoomRatio = nextZoom
+  }
+
+  private func clampedZoomRatio(_ ratio: CGFloat, for device: AVCaptureDevice) -> CGFloat {
+    min(max(ratio, device.minAvailableVideoZoomFactor), device.maxAvailableVideoZoomFactor)
+  }
+
   private func configureAudioInput(enabled: Bool) throws {
     session.beginConfiguration()
     defer { session.commitConfiguration() }
@@ -502,7 +561,30 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
     try FileManager.default.createDirectory(at: recordingsURL, withIntermediateDirectories: true)
 
     let fileName = Self.resolveFileName(displayName: displayName)
-    return recordingsURL.appendingPathComponent(fileName)
+    return uniqueOutputURL(in: recordingsURL, preferredFileName: fileName)
+  }
+
+  private func uniqueOutputURL(in directoryURL: URL, preferredFileName: String) -> URL {
+    let preferredURL = directoryURL.appendingPathComponent(preferredFileName)
+    guard !FileManager.default.fileExists(atPath: preferredURL.path) else {
+      let fileExtension = preferredURL.pathExtension
+      let baseName = preferredURL.deletingPathExtension().lastPathComponent
+      let timestamp = Self.fileNameDateFormatter.string(from: Date())
+
+      var index = 0
+      while true {
+        let suffix = index == 0 ? timestamp : "\(timestamp)_\(index)"
+        let nextName = fileExtension.isEmpty
+          ? "\(baseName)_\(suffix)"
+          : "\(baseName)_\(suffix).\(fileExtension)"
+        let nextURL = directoryURL.appendingPathComponent(nextName)
+        if !FileManager.default.fileExists(atPath: nextURL.path) {
+          return nextURL
+        }
+        index += 1
+      }
+    }
+    return preferredURL
   }
 
   private static func resolveFileName(displayName: String?) -> String {
@@ -520,6 +602,13 @@ private final class RecordingCameraController: NSObject, AVCaptureFileOutputReco
     return "REC_\(formatter.string(from: Date())).mov"
   }
 
+  private static let fileNameDateFormatter: DateFormatter = {
+    let formatter = DateFormatter()
+    formatter.locale = Locale(identifier: "en_US_POSIX")
+    formatter.dateFormat = "yyyyMMdd_HHmmss"
+    return formatter
+  }()
+
   private func updateStatus(_ next: RecordingStatus) {
     status = next
   }
@@ -544,9 +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 {
@@ -587,6 +676,12 @@ final class RecordingPlugin: NSObject, FlutterPlugin, FlutterStreamHandler {
       controller.startRecording(withAudio: withAudio, displayName: displayName, result: result)
     case "stopRecording":
       controller.stopRecording(result: result)
+    case "getZoomCapabilities":
+      controller.zoomCapabilities(result: result)
+    case "setZoomRatio":
+      let args = call.arguments as? [String: Any]
+      let ratio = args?["zoomRatio"] as? Double ?? 1.0
+      controller.setZoomRatio(CGFloat(ratio), result: result)
     case "disposePreview":
       controller.disposePreview(result: result)
     case "getStatus":

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

@@ -7,30 +7,40 @@ class RecordingSessionState {
     this.isTouchLocked = true,
     this.isPreviewReady = false,
     this.isStartingRecording = false,
+    this.isSwitchingLens = false,
     this.hasDndAccess = false,
     this.isBatteryOptimizedIgnored = true,
     this.notificationsGranted = true,
     this.isMicrophoneGranted = false,
+    this.zoomRatio = 1.0,
+    this.minZoomRatio = 1.0,
+    this.maxZoomRatio = 3.0,
     this.lastOutputPath,
     this.lastSavedDisplayName,
     this.errorMessage,
     this.permissionWarning,
-    this.gallerySaveFailed = false,
+    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;
   final bool isMicrophoneGranted;
+  final double zoomRatio;
+  final double minZoomRatio;
+  final double maxZoomRatio;
   final String? lastOutputPath;
   final String? lastSavedDisplayName;
   final String? errorMessage;
   final String? permissionWarning;
-  final bool gallerySaveFailed;
+  final bool fileSaveFailed;
+  final List<String> segmentOutputPaths;
 
   bool get isRecording => status.isRecording;
 
@@ -47,15 +57,20 @@ class RecordingSessionState {
     bool? isTouchLocked,
     bool? isPreviewReady,
     bool? isStartingRecording,
+    bool? isSwitchingLens,
     bool? hasDndAccess,
     bool? isBatteryOptimizedIgnored,
     bool? notificationsGranted,
     bool? isMicrophoneGranted,
+    double? zoomRatio,
+    double? minZoomRatio,
+    double? maxZoomRatio,
     String? lastOutputPath,
     String? lastSavedDisplayName,
     String? errorMessage,
     String? permissionWarning,
-    bool? gallerySaveFailed,
+    bool? fileSaveFailed,
+    List<String>? segmentOutputPaths,
     bool clearPermissionWarning = false,
     bool clearLastSaved = false,
   }) {
@@ -64,11 +79,15 @@ 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,
       notificationsGranted: notificationsGranted ?? this.notificationsGranted,
       isMicrophoneGranted: isMicrophoneGranted ?? this.isMicrophoneGranted,
+      zoomRatio: zoomRatio ?? this.zoomRatio,
+      minZoomRatio: minZoomRatio ?? this.minZoomRatio,
+      maxZoomRatio: maxZoomRatio ?? this.maxZoomRatio,
       lastOutputPath: lastOutputPath ?? this.lastOutputPath,
       lastSavedDisplayName: clearLastSaved
           ? null
@@ -77,7 +96,8 @@ class RecordingSessionState {
       permissionWarning: clearPermissionWarning
           ? null
           : (permissionWarning ?? this.permissionWarning),
-      gallerySaveFailed: gallerySaveFailed ?? this.gallerySaveFailed,
+      fileSaveFailed: fileSaveFailed ?? this.fileSaveFailed,
+      segmentOutputPaths: segmentOutputPaths ?? this.segmentOutputPaths,
     );
   }
 }

lib/features/recording/pages/page_record.dart

@@ -172,8 +172,12 @@ class _RecordingPageState extends ConsumerState<RecordingPage> {
     await ref.read(recordingViewModelProvider.notifier).stopRecording();
     if (!mounted) return;
     final latest = ref.read(recordingViewModelProvider).session;
-    if (latest.gallerySaveFailed) {
-      AppToast.show(latest.errorMessage ?? '保存到相册失败，请开启相册权限');
+    if (latest.fileSaveFailed) {
+      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();
@@ -190,7 +194,7 @@ class _RecordingPageState extends ConsumerState<RecordingPage> {
   Future<void> _showRecordingSavedDialogIfNeeded() async {
     final recordingInfo = ref.read(recordingViewModelProvider);
     final session = recordingInfo.session;
-    if (session.lastSavedDisplayName == null || session.gallerySaveFailed) {
+    if (session.lastSavedDisplayName == null || session.fileSaveFailed) {
       return;
     }
 
@@ -357,10 +361,7 @@ class _PreviewLoadingLayer extends ConsumerWidget {
 }
 
 class _RecordingHudLayer extends ConsumerWidget {
-  const _RecordingHudLayer({
-    required this.onStart,
-    required this.onStop,
-  });
+  const _RecordingHudLayer({required this.onStart, required this.onStop});
 
   final Future<void> Function() onStart;
   final Future<void> Function() onStop;
@@ -377,7 +378,11 @@ 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,
+          m.session.maxZoomRatio,
           m.hasValidClipboardInfo,
           m.clipboardRecordingModel.address.trim(),
         ),
@@ -391,7 +396,11 @@ class _RecordingHudLayer extends ConsumerWidget {
       notificationsGranted,
       isRecording,
       isStartingRecording,
+      isSwitchingLens,
       isTouchLocked,
+      zoomRatio,
+      minZoomRatio,
+      maxZoomRatio,
       showClipboardHint,
       clipboardAddress,
     ) = hudState;
@@ -405,7 +414,11 @@ class _RecordingHudLayer extends ConsumerWidget {
       notificationsGranted: notificationsGranted,
       isRecording: isRecording,
       isStartingRecording: isStartingRecording,
+      isSwitchingLens: isSwitchingLens,
       isTouchLocked: isTouchLocked,
+      zoomRatio: zoomRatio,
+      minZoomRatio: minZoomRatio,
+      maxZoomRatio: maxZoomRatio,
       showClipboardHint: showClipboardHint,
       clipboardAddress: clipboardAddress,
       onStart: onStart,
@@ -419,9 +432,15 @@ class _RecordingHudLayer extends ConsumerWidget {
         await viewModel.refreshBatteryOptimization();
       },
       onToggleTouchLock: () {
-        final locked = ref.read(recordingViewModelProvider).session.isTouchLocked;
+        final locked = ref
+            .read(recordingViewModelProvider)
+            .session
+            .isTouchLocked;
         viewModel.setTouchLocked(!locked);
       },
+      onZoomSelected: (ratio) async {
+        await viewModel.setZoomRatio(ratio);
+      },
     );
   }
 }

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

@@ -81,6 +81,21 @@ class RecordingPlatform {
     return RecordingStatus.fromMap(result ?? const {});
   }
 
+  static Future<RecordingZoomCapabilities> getZoomCapabilities() async {
+    final result = await _channel.invokeMapMethod<String, dynamic>(
+      'getZoomCapabilities',
+    );
+    return RecordingZoomCapabilities.fromMap(result);
+  }
+
+  static Future<RecordingZoomCapabilities> setZoomRatio(double ratio) async {
+    final result = await _channel.invokeMapMethod<String, dynamic>(
+      'setZoomRatio',
+      <String, dynamic>{'zoomRatio': ratio},
+    );
+    return RecordingZoomCapabilities.fromMap(result);
+  }
+
   static Future<RecordingStartResult> startRecording({
     bool withAudio = true,
     bool enableDoNotDisturb = true,
@@ -156,6 +171,29 @@ class RecordingPlatform {
   }
 }
 
+class RecordingZoomCapabilities {
+  const RecordingZoomCapabilities({
+    required this.zoomRatio,
+    required this.minZoomRatio,
+    required this.maxZoomRatio,
+  });
+
+  final double zoomRatio;
+  final double minZoomRatio;
+  final double maxZoomRatio;
+
+  factory RecordingZoomCapabilities.fromMap(Map<String, dynamic>? map) {
+    final minZoomRatio = (map?['minZoomRatio'] as num?)?.toDouble() ?? 1.0;
+    final maxZoomRatio = (map?['maxZoomRatio'] as num?)?.toDouble() ?? 3.0;
+    final zoomRatio = (map?['zoomRatio'] as num?)?.toDouble() ?? minZoomRatio;
+    return RecordingZoomCapabilities(
+      zoomRatio: zoomRatio.clamp(minZoomRatio, maxZoomRatio).toDouble(),
+      minZoomRatio: minZoomRatio,
+      maxZoomRatio: maxZoomRatio,
+    );
+  }
+}
+
 class RecordingStartResult {
   const RecordingStartResult({this.outputPath, required this.status});
 
@@ -167,14 +205,16 @@ class RecordingStopResult {
   const RecordingStopResult({
     this.outputPath,
     required this.status,
-    this.gallerySaved = true,
-    this.galleryErrorMessage,
+    this.fileSaved = true,
+    this.fileErrorMessage,
+    this.segmentOutputPaths = const [],
   });
 
   final String? outputPath;
   final RecordingStatus status;
-  final bool gallerySaved;
-  final String? galleryErrorMessage;
+  final bool fileSaved;
+  final String? fileErrorMessage;
+  final List<String> segmentOutputPaths;
 
   factory RecordingStopResult.fromMap(Map<String, dynamic>? result) {
     return RecordingStopResult(
@@ -182,8 +222,13 @@ class RecordingStopResult {
       status: RecordingStatus.fromMap(
         Map<dynamic, dynamic>.from(result?['status'] as Map? ?? const {}),
       ),
-      gallerySaved: result?['gallerySaved'] as bool? ?? true,
-      galleryErrorMessage: result?['galleryErrorMessage'] as String?,
+      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

@@ -7,6 +7,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:permission_handler/permission_handler.dart';
 import 'package:recording_tool/core/logging/app_logger.dart';
 import 'package:recording_tool/core/permission/permission_service.dart';
+import 'package:recording_tool/core/platform/app_platform_info.dart';
 import 'package:recording_tool/features/recording/model/model_clipboard.dart';
 import 'package:recording_tool/features/recording/model/model_recording.dart';
 import 'package:recording_tool/features/recording/model/model_recording_session.dart';
@@ -31,15 +32,19 @@ enum ClipboardReadResult {
   invalid,
 }
 
-List<Permission> recordingGalleryPermissionsForHost({
+List<Permission> recordingFileSavePermissionsForHost({
   required bool isIOS,
   required bool isAndroid,
+  int? androidSdkInt,
 }) {
   if (isIOS) {
-    return [Permission.photosAddOnly];
+    return const [];
   }
   if (isAndroid) {
-    return [Permission.videos, Permission.storage];
+    if (androidSdkInt != null && androidSdkInt <= 28) {
+      return [Permission.storage];
+    }
+    return const [];
   }
   return const [];
 }
@@ -144,11 +149,12 @@ class RecordingViewModel extends Notifier<RecordingModel> {
       return;
     }
 
+    final fileSavePermissions = await _fileSavePermissions();
     final permissions = await PermissionService.requestMissing([
       Permission.camera,
       Permission.microphone,
       if (Platform.isAndroid) Permission.notification,
-      ..._galleryPermissions(),
+      ...fileSavePermissions,
     ]);
 
     final cameraGranted = permissions[Permission.camera]?.isGranted ?? false;
@@ -170,8 +176,8 @@ class RecordingViewModel extends Notifier<RecordingModel> {
     if (!microphoneGranted) {
       warnings.add('未授予麦克风权限，当前将以静音模式录制');
     }
-    if (!_isGalleryPermissionGranted(permissions)) {
-      warnings.add('未授予相册权限，录制结束后可能无法保存到相册');
+    if (!_isFileSavePermissionGranted(permissions, fileSavePermissions)) {
+      warnings.add('未授予文件保存权限，录制结束后可能无法保存到文件夹');
     }
 
     final hasDnd = await RecordingPlatform.hasNotificationPolicyAccess();
@@ -193,6 +199,7 @@ class RecordingViewModel extends Notifier<RecordingModel> {
     await _listenStatus();
     try {
       final status = await _initializePreviewWithRetry();
+      await _refreshZoomCapabilities();
       _updateSession(
         (s) => s.copyWith(
           status: status,
@@ -239,6 +246,7 @@ class RecordingViewModel extends Notifier<RecordingModel> {
     );
     try {
       final status = await _initializePreviewWithRetry();
+      await _refreshZoomCapabilities();
       _updateSession(
         (s) => s.copyWith(
           status: status,
@@ -258,24 +266,36 @@ class RecordingViewModel extends Notifier<RecordingModel> {
     }
   }
 
-  /// 当前平台所需的相册/视频保存权限列表。
-  List<Permission> _galleryPermissions() {
-    return recordingGalleryPermissionsForHost(
+  /// 当前平台所需的视频文件保存权限列表。
+  Future<List<Permission>> _fileSavePermissions() async {
+    int? androidSdkInt;
+    if (Platform.isAndroid) {
+      try {
+        androidSdkInt = int.tryParse(
+          (await AppPlatformInfo.deviceInfo()).values['sdkInt'] ?? '',
+        );
+      } on PlatformException {
+        androidSdkInt = null;
+      }
+    }
+    return recordingFileSavePermissionsForHost(
       isIOS: Platform.isIOS,
       isAndroid: Platform.isAndroid,
+      androidSdkInt: androidSdkInt,
     );
   }
 
-  /// 判断相册相关权限是否至少有一项已授予。
-  bool _isGalleryPermissionGranted(
+  /// 判断文件保存相关权限是否至少有一项已授予。
+  bool _isFileSavePermissionGranted(
     Map<Permission, PermissionStatus> permissions,
+    List<Permission> fileSavePermissions,
   ) {
-    for (final permission in _galleryPermissions()) {
+    for (final permission in fileSavePermissions) {
       if (permissions[permission]?.isGranted ?? false) {
         return true;
       }
     }
-    return _galleryPermissions().isEmpty;
+    return fileSavePermissions.isEmpty;
   }
 
   /// 检测并尝试申请相机、麦克风权限，同步更新 session 中的 isMicrophoneGranted。
@@ -309,10 +329,62 @@ class RecordingViewModel extends Notifier<RecordingModel> {
     return status?.isGranted == true || status?.isLimited == true;
   }
 
+  /// 读取相机支持的倍距范围并同步当前倍距。
+  Future<void> _refreshZoomCapabilities() async {
+    try {
+      final zoom = await RecordingPlatform.getZoomCapabilities();
+      _updateSession(
+        (s) => s.copyWith(
+          zoomRatio: zoom.zoomRatio,
+          minZoomRatio: zoom.minZoomRatio,
+          maxZoomRatio: zoom.maxZoomRatio,
+          errorMessage: null,
+        ),
+      );
+    } on PlatformException catch (error) {
+      AppLogger.debug('读取相机倍距能力失败', error: error);
+    }
+  }
+
+  /// 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(
+        (s) => s.copyWith(
+          zoomRatio: zoom.zoomRatio,
+          minZoomRatio: zoom.minZoomRatio,
+          maxZoomRatio: zoom.maxZoomRatio,
+          errorMessage: null,
+        ),
+      );
+    } 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(isSwitchingLens: false, errorMessage: s.errorMessage),
+      );
+    }
+  }
+
   /// 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) {
@@ -338,7 +410,8 @@ class RecordingViewModel extends Notifier<RecordingModel> {
           lastOutputPath: result.outputPath,
           isTouchLocked: true,
           errorMessage: null,
-          gallerySaveFailed: false,
+          fileSaveFailed: false,
+          segmentOutputPaths: const [],
           clearLastSaved: true,
         ),
       );
@@ -351,13 +424,13 @@ class RecordingViewModel extends Notifier<RecordingModel> {
     }
   }
 
-  /// 停止录制、保存到相册，并恢复相机预览。
+  /// 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();
-      final galleryFailed = !result.gallerySaved;
+      final fileFailed = !result.fileSaved;
       final savedName = recordingFileNameForPlatform(
         state.clipboardRecordingModel.filename,
       );
@@ -365,11 +438,12 @@ class RecordingViewModel extends Notifier<RecordingModel> {
         (s) => s.copyWith(
           status: result.status,
           lastOutputPath: result.outputPath ?? s.lastOutputPath,
-          lastSavedDisplayName: galleryFailed ? null : savedName,
-          errorMessage: galleryFailed
-              ? (result.galleryErrorMessage ?? '保存到相册失败，请开启相册权限')
+          lastSavedDisplayName: fileFailed ? null : savedName,
+          errorMessage: fileFailed
+              ? (result.fileErrorMessage ?? '保存到文件夹失败，请检查文件保存权限')
               : null,
-          gallerySaveFailed: galleryFailed,
+          fileSaveFailed: fileFailed,
+          segmentOutputPaths: result.segmentOutputPaths,
         ),
       );
     } on PlatformException catch (error) {

lib/features/recording/widgets/widget_recording_hud.dart

@@ -18,14 +18,19 @@ class RecordingHudWidget extends StatelessWidget {
     required this.notificationsGranted,
     required this.isRecording,
     required this.isStartingRecording,
+    required this.isSwitchingLens,
     required this.isTouchLocked,
     this.showClipboardHint = false,
     this.clipboardAddress = '',
+    required this.zoomRatio,
+    required this.minZoomRatio,
+    required this.maxZoomRatio,
     required this.onStart,
     required this.onStop,
     required this.onOpenDnd,
     required this.onOpenBattery,
     required this.onToggleTouchLock,
+    required this.onZoomSelected,
   });
 
   final String? errorMessage;
@@ -35,14 +40,19 @@ 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;
+  final double zoomRatio;
+  final double minZoomRatio;
+  final double maxZoomRatio;
   final Future<void> Function() onStart;
   final Future<void> Function() onStop;
   final VoidCallback onOpenDnd;
   final VoidCallback onOpenBattery;
   final VoidCallback onToggleTouchLock;
+  final ValueChanged<double> onZoomSelected;
 
   static double get _recordButtonSize => 70.r;
   static double get _recordButtonBottom => 63.r;
@@ -133,6 +143,18 @@ class RecordingHudWidget extends StatelessWidget {
               ),
             ),
           ),
+        Positioned(
+          right: 16.r,
+          bottom: 260.r,
+          child: _ZoomPresetControl(
+            enabled: !isSwitchingLens,
+            zoomRatio: zoomRatio,
+            minZoomRatio: minZoomRatio,
+            maxZoomRatio: maxZoomRatio,
+            presets: _zoomPresetsForRange(minZoomRatio),
+            onSelected: onZoomSelected,
+          ),
+        ),
         Positioned(
           left: 0,
           right: 0,
@@ -141,7 +163,7 @@ class RecordingHudWidget extends StatelessWidget {
             child: RecordingControlButton(
               isRecording: isRecording,
               isStartingRecording: isStartingRecording,
-              enabled: !isStartingRecording,
+              enabled: !isStartingRecording && !isSwitchingLens,
               size: _recordButtonSize,
               onTap: () {
                 if (isRecording) {
@@ -170,4 +192,140 @@ 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,
+    required this.presets,
+    required this.onSelected,
+  });
+
+  final bool enabled;
+  final double zoomRatio;
+  final double minZoomRatio;
+  final double maxZoomRatio;
+  final List<double> presets;
+  final ValueChanged<double> onSelected;
+
+  @override
+  Widget build(BuildContext context) {
+    final availablePresets = presets
+        .where(_isPresetAvailable)
+        .toList(growable: false);
+    if (availablePresets.isEmpty) {
+      return const SizedBox.shrink();
+    }
+
+    return DecoratedBox(
+      decoration: BoxDecoration(
+        color: Colors.black.withValues(alpha: 0.46),
+        borderRadius: BorderRadius.circular(18.r),
+        border: Border.all(color: Colors.white.withValues(alpha: 0.18)),
+      ),
+      child: Padding(
+        padding: EdgeInsets.all(3.r),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            for (final preset in availablePresets)
+              _ZoomPresetButton(
+                displayRatio: preset,
+                requestRatio: preset,
+                selected: _isPresetSelected(preset),
+                enabled: enabled,
+                onSelected: onSelected,
+              ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  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.displayRatio,
+    required this.requestRatio,
+    required this.selected,
+    required this.enabled,
+    required this.onSelected,
+  });
+
+  final double displayRatio;
+  final double requestRatio;
+  final bool selected;
+  final bool enabled;
+  final ValueChanged<double> onSelected;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: EdgeInsets.symmetric(horizontal: 1.r),
+      child: TextButton(
+        onPressed: selected || !enabled
+            ? null
+            : () => RateLimit.instance.debounce<void>(
+                key:
+                    'recording.session.zoom.${requestRatio.toStringAsFixed(1)}',
+                value: null,
+                duration: Duration(milliseconds: 300),
+                onCallback: (_) async {
+                  onSelected(requestRatio);
+                },
+              ),
+        style: TextButton.styleFrom(
+          minimumSize: Size(38.r, 32.r),
+          padding: EdgeInsets.zero,
+          tapTargetSize: MaterialTapTargetSize.shrinkWrap,
+          foregroundColor: selected ? Colors.black : Colors.white,
+          disabledForegroundColor: Colors.black,
+          backgroundColor: selected ? Colors.white : Colors.transparent,
+          disabledBackgroundColor: Colors.white,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(15.r),
+          ),
+        ),
+        child: Text(
+          _formatZoomRatio(displayRatio),
+          style: TextStyle(
+            fontSize: 13.sp,
+            fontWeight: FontWeight.w700,
+            letterSpacing: 0,
+          ),
+        ),
+      ),
+    );
+  }
+
+  String _formatZoomRatio(double ratio) {
+    if (ratio < 1.0) {
+      return '广角';
+    }
+    if (ratio == ratio.roundToDouble()) {
+      return '${ratio.toStringAsFixed(0)}x';
+    }
+    return '${ratio.toStringAsFixed(1)}x';
+  }
 }

lib/features/recording/widgets/widget_recording_saved_dialog.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:recording_tool/features/dialog/dialog-record.dart';
 
-/// 录制结束并保存到相册后的后续操作弹窗。
+/// 录制结束并保存到文件夹后的后续操作弹窗。
 Future<void> showRecordingSavedDialog(
   BuildContext context, {
   required String sessionTitle,
@@ -10,7 +10,7 @@ Future<void> showRecordingSavedDialog(
 }) {
   return RecordDialog.showDouble(
     context,
-    title: '本轮比赛视频已保存到相册\n请选择后续录制信息',
+    title: '本轮比赛视频已保存到文件夹\n请选择后续录制信息',
     leftText: '继续本轮',
     rightText: '录制新轮',
     onLeftPressed: onContinueRound,

test/core/permission/permission_service_test.dart

@@ -71,7 +71,7 @@ void main() {
   });
 
   group('iOS permission configuration', () {
-    test('Podfile enables camera, microphone and photos permission macros', () {
+    test('Podfile enables camera and microphone permission macros only', () {
       final podfile = File('ios/Podfile').readAsStringSync();
 
       expect(
@@ -80,8 +80,8 @@ void main() {
       );
       expect(podfile, contains("'PERMISSION_CAMERA=1'"));
       expect(podfile, contains("'PERMISSION_MICROPHONE=1'"));
-      expect(podfile, contains("'PERMISSION_PHOTOS=1'"));
-      expect(podfile, contains("'PERMISSION_PHOTOS_ADD_ONLY=1'"));
+      expect(podfile, isNot(contains("'PERMISSION_PHOTOS=1'")));
+      expect(podfile, isNot(contains("'PERMISSION_PHOTOS_ADD_ONLY=1'")));
     });
   });
 }

test/features/dialog/record_dialog_test.dart

@@ -68,7 +68,7 @@ void main() {
             onPressed: () {
               RecordDialog.showDouble(
                 context,
-                title: '本轮比赛视频已保存到相册\n请选择后续录制信息',
+                title: '本轮比赛视频已保存到文件夹\n请选择后续录制信息',
                 leftText: '继续本轮',
                 rightText: '录制新轮',
                 onLeftPressed: () => leftTapped = true,
@@ -123,7 +123,7 @@ void main() {
     await tester.pumpAndSettle();
 
     expect(find.text('王东方 丨李想 空中格斗赛'), findsNothing);
-    expect(find.text('本轮比赛视频已保存到相册\n请选择后续录制信息'), findsOneWidget);
+    expect(find.text('本轮比赛视频已保存到文件夹\n请选择后续录制信息'), findsOneWidget);
     expect(find.text('继续本轮'), findsOneWidget);
     expect(find.text('录制新轮'), findsOneWidget);
   });

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(
@@ -18,4 +26,20 @@ void main() {
       );
     });
   });
+
+  group('RecordingStopResult', () {
+    test('parses file save result fields from platform payload', () {
+      final result = RecordingStopResult.fromMap(<String, dynamic>{
+        'outputPath': '/Documents/recordings/test.mov',
+        'status': <String, dynamic>{'state': 'previewing'},
+        'fileSaved': false,
+        'fileErrorMessage': '保存到文件夹失败',
+      });
+
+      expect(result.outputPath, '/Documents/recordings/test.mov');
+      expect(result.status.state, RecordingState.previewing);
+      expect(result.fileSaved, isFalse);
+      expect(result.fileErrorMessage, '保存到文件夹失败');
+    });
+  });
 }

test/features/recording/view_model_recording_test.dart

@@ -1,7 +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() {
@@ -24,6 +29,11 @@ void main() {
   tearDown(() {
     TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
         .setMockMethodCallHandler(SystemChannels.platform, null);
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(
+          const MethodChannel(RecordingChannelNames.method),
+          null,
+        );
   });
 
   group('RecordingViewModel', () {
@@ -36,27 +46,389 @@ void main() {
       expect(model.clipboardRecordingModel.title, defaultClipboardTitle);
       expect(model.session.isPreviewReady, isFalse);
       expect(model.session.isRecording, isFalse);
+      expect(model.session.zoomRatio, 1.0);
+      expect(model.session.minZoomRatio, 1.0);
+      expect(model.session.maxZoomRatio, 3.0);
     });
   });
 
-  group('recordingGalleryPermissionsForHost', () {
-    test('requests only add-only photo permission on iOS', () {
-      final permissions = recordingGalleryPermissionsForHost(
+  group('RecordingViewModel.setZoomRatio', () {
+    test('updates zoom ratio from native response', () async {
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(
+            const MethodChannel(RecordingChannelNames.method),
+            (call) async {
+              expect(call.method, 'setZoomRatio');
+              expect(call.arguments, <String, dynamic>{'zoomRatio': 2.0});
+              return <String, dynamic>{
+                'zoomRatio': 2.0,
+                'minZoomRatio': 1.0,
+                'maxZoomRatio': 3.0,
+              };
+            },
+          );
+      final container = ProviderContainer();
+      addTearDown(container.dispose);
+
+      await container.read(recordingViewModelProvider.notifier).setZoomRatio(2);
+
+      final session = container.read(recordingViewModelProvider).session;
+      expect(session.zoomRatio, 2.0);
+      expect(session.minZoomRatio, 1.0);
+      expect(session.maxZoomRatio, 3.0);
+      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
+          .setMockMethodCallHandler(
+            const MethodChannel(RecordingChannelNames.method),
+            (call) async {
+              calls.add(call);
+              return <String, dynamic>{
+                'zoomRatio': 1.0,
+                'minZoomRatio': 1.0,
+                'maxZoomRatio': 1.0,
+              };
+            },
+          );
+      final container = ProviderContainer();
+      addTearDown(container.dispose);
+
+      await container.read(recordingViewModelProvider.notifier).setZoomRatio(4);
+
+      expect(calls.single.arguments, <String, dynamic>{'zoomRatio': 3.0});
+      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 {
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(
+              const MethodChannel(RecordingChannelNames.method),
+              (call) async {
+                throw PlatformException(
+                  code: 'ZOOM_FAILED',
+                  message: 'Zoom is unavailable',
+                );
+              },
+            );
+        final container = ProviderContainer();
+        addTearDown(container.dispose);
+
+        await container
+            .read(recordingViewModelProvider.notifier)
+            .setZoomRatio(2);
+
+        final session = container.read(recordingViewModelProvider).session;
+        expect(session.zoomRatio, 1.0);
+        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',
+        ]);
+      },
+    );
+  });
+
+  group('recordingFileSavePermissionsForHost', () {
+    test('does not request photo permission on iOS', () {
+      final permissions = recordingFileSavePermissionsForHost(
         isIOS: true,
         isAndroid: false,
       );
 
-      expect(permissions, <Permission>[Permission.photosAddOnly]);
+      expect(permissions, isEmpty);
+      expect(permissions, isNot(contains(Permission.photosAddOnly)));
       expect(permissions, isNot(contains(Permission.photos)));
     });
 
-    test('keeps Android gallery permissions unchanged', () {
-      final permissions = recordingGalleryPermissionsForHost(
+    test('requests storage permission on Android 9 and below', () {
+      final permissions = recordingFileSavePermissionsForHost(
+        isIOS: false,
+        isAndroid: true,
+        androidSdkInt: 28,
+      );
+
+      expect(permissions, <Permission>[Permission.storage]);
+      expect(permissions, isNot(contains(Permission.videos)));
+    });
+
+    test('does not request file save permission on Android 10 and above', () {
+      final permissions = recordingFileSavePermissionsForHost(
+        isIOS: false,
+        isAndroid: true,
+        androidSdkInt: 29,
+      );
+
+      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, <Permission>[Permission.videos, Permission.storage]);
+      expect(permissions, isEmpty);
     });
   });
 

test/features/recording/widget_recording_hud_test.dart

@@ -0,0 +1,231 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:recording_tool/features/recording/widgets/widget_recording_hud.dart';
+
+void main() {
+  Future<void> pumpHud(
+    WidgetTester tester, {
+    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(
+      ScreenUtilInit(
+        designSize: const Size(375, 812),
+        builder: (context, _) {
+          return MaterialApp(
+            home: Scaffold(
+              backgroundColor: Colors.black,
+              body: RecordingHudWidget(
+                hasDndAccess: true,
+                isBatteryOptimizedIgnored: true,
+                notificationsGranted: true,
+                isRecording: isRecording,
+                isStartingRecording: false,
+                isSwitchingLens: isSwitchingLens,
+                isTouchLocked: false,
+                zoomRatio: zoomRatio,
+                minZoomRatio: minZoomRatio,
+                maxZoomRatio: maxZoomRatio,
+                onStart: () async {},
+                onStop: onStop ?? () async {},
+                onOpenDnd: () {},
+                onOpenBattery: () {},
+                onToggleTouchLock: () {},
+                onZoomSelected: onZoomSelected ?? (_) {},
+              ),
+            ),
+          );
+        },
+      ),
+    );
+    await tester.pump();
+  }
+
+  testWidgets('shows preset zoom buttons', (tester) async {
+    await pumpHud(tester);
+
+    expect(find.text('广角'), findsNothing);
+    expect(find.text('1x'), findsOneWidget);
+    expect(find.text('2x'), findsNothing);
+    expect(find.text('3x'), findsNothing);
+  });
+
+  testWidgets('shows wide angle when ultra-wide camera capability is 0.5', (
+    tester,
+  ) async {
+    await pumpHud(tester, minZoomRatio: 0.5);
+
+    expect(find.text('广角'), findsOneWidget);
+    expect(find.text('1x'), findsOneWidget);
+    expect(find.text('2x'), findsNothing);
+    expect(find.text('3x'), findsNothing);
+  });
+
+  testWidgets('shows wide angle when 0.6x camera capability supports it', (
+    tester,
+  ) async {
+    await pumpHud(tester, minZoomRatio: 0.6);
+
+    expect(find.text('广角'), findsOneWidget);
+    expect(find.text('1x'), findsOneWidget);
+  });
+
+  testWidgets('marks current 0.5x wide angle ratio as selected', (
+    tester,
+  ) async {
+    await pumpHud(tester, zoomRatio: 0.5, minZoomRatio: 0.5);
+
+    final selectedButton = tester.widget<TextButton>(
+      find.ancestor(of: find.text('广角'), matching: find.byType(TextButton)),
+    );
+    expect(selectedButton.enabled, isFalse);
+  });
+
+  testWidgets('marks current 0.6x wide angle ratio as selected', (
+    tester,
+  ) async {
+    await pumpHud(tester, zoomRatio: 0.6, minZoomRatio: 0.6);
+
+    final selectedButton = tester.widget<TextButton>(
+      find.ancestor(of: find.text('广角'), matching: find.byType(TextButton)),
+    );
+    expect(selectedButton.enabled, isFalse);
+  });
+
+  testWidgets('does not expose presets beyond max zoom ratio', (tester) async {
+    await pumpHud(tester, minZoomRatio: 0.5, maxZoomRatio: 0.55);
+
+    expect(find.text('广角'), findsOneWidget);
+    expect(find.text('1x'), findsNothing);
+  });
+
+  testWidgets('tapping 0.5x reports 0.5 when camera capability is 0.5', (
+    tester,
+  ) async {
+    double? selected;
+    await pumpHud(
+      tester,
+      minZoomRatio: 0.5,
+      onZoomSelected: (ratio) => selected = ratio,
+    );
+
+    await tester.tap(find.text('广角'));
+    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('广角'));
+    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('广角'), 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('广角'));
+    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('广角'), 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(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('广角'), matching: find.byType(TextButton)),
+    );
+
+    expect(ultraWideButton.enabled, isFalse);
+    await tester.tap(find.text('广角'));
+    await tester.pump(const Duration(milliseconds: 350));
+
+    expect(selected, isNull);
+  });
+}