隐形守护者-基于Rokid AI眼镜的家庭位置共享AR应用开发

Rokid CXR-M SDK是面向移动端的开发工具包，主要用于构建手机端与Rokid Glasses的控制和协同应用。该SDK通过蓝牙和Wi-Fi双通道连接，实现设备间的数据通信、实时音视频获取以及场景自定义。其核心架构如下图所示：设备连接与状态管理（蓝牙/Wi-Fi）自定义AI助手场景媒体操作（拍照、录像、录音）数据传输与文件同步自定义AR界面展示这些能力为实现家庭位置共享应用提供了坚实的技术

小妖同学学AI

265人浏览 · 2025-11-28 12:35:59

小妖同学学AI · 2025-11-28 12:35:59 发布

数字时代下的家庭安全新需求

技术基础：Rokid CXR-M SDK核心能力解析

小伙伴们，今天给大家分享如何利用Rokid CXR-M SDK开发一款家庭成员位置共享应用，通过手机与AI眼镜的协同工作，为家庭安全提供可视化保障。我们从系统架构设计出发，深入剖析蓝牙/Wi-Fi连接、位置获取、数据同步、AR界面展示等核心模块的实现细节，并结合实际代码示例展示了位置共享场景下的技术难点与解决方案。该应用不仅实现了基础的位置追踪功能，还创新性地结合AR技术提供沉浸式家庭安全体验，同时严格保障用户隐私安全。通过本项目的开发实践，验证了Rokid AI眼镜在家庭安全领域的巨大应用潜力。

数字时代下的家庭安全新需求

在快节奏的现代生活中，家庭成员时常如同散落的星辰，分布在不同坐标：孩子奔波于校园，父母穿梭于职场，老人则可能在外散步或参与社区活动。这种时空上的分散，虽是社会运行的常态，却也织就了一张无形的牵挂之网，使得及时、准确地知晓家人位置成为一种强烈而普遍的情感需求。

然而，传统的位置共享应用多依赖于手机屏幕，操作往往繁琐，需要经历解锁、打开应用、等待加载等一系列步骤。在买菜、拎东西或骑行等日常场景中，频繁查看手机既不现实，也构成了潜在的安全隐患。更为棘手的是，在真正紧急或焦虑的时刻——例如孩子未能按时回家，或长者长时间失联——这类应用无法提供“一眼即得”的直观信息。用户往往需要在一片焦急中，费力地在地图缩放下辨认位置，这种延迟与不确定性，恰恰与“即时安心”的初衷背道而驰。

Rokid AI眼镜凭借其轻量化设计、AR显示能力和多模态交互特性，为家庭位置共享提供了全新解决方案。通过将位置信息直接投射在用户视野中，无需频繁查看手机，即可随时了解家人安全状态。这种"隐形守护"模式更加自然、低干扰，特别适合家庭场景使用。

根据《2025年智能穿戴设备安全应用白皮书》显示，73%的家长希望有更便捷的方式来关注孩子安全，而62%的老年人表示愿意使用不打扰日常生活的安全监护设备。Rokid眼镜的位置共享应用正是回应这一市场需求的创新尝试。

技术基础：Rokid CXR-M SDK核心能力解析

SDK概述与架构

Rokid CXR-M SDK是面向移动端的开发工具包，主要用于构建手机端与Rokid Glasses的控制和协同应用。该SDK通过蓝牙和Wi-Fi双通道连接，实现设备间的数据通信、实时音视频获取以及场景自定义。其核心架构如下图所示：

CXR-M SDK支持多种关键功能，包括：

设备连接与状态管理（蓝牙/Wi-Fi）
自定义AI助手场景
媒体操作（拍照、录像、录音）
数据传输与文件同步
自定义AR界面展示

这些能力为实现家庭位置共享应用提供了坚实的技术基础。

权限与依赖配置

在开发前，需要正确配置项目依赖和权限。根据SDK文档，需要添加以下关键依赖：

// build.gradle.kts
dependencies {
    implementation("com.rokid.cxr:client-m:1.0.1-20250812.080117-2")
    implementation("com.squareup.retrofit2:retrofit:2.9.0")
    implementation("com.squareup.retrofit2:converter-gson:2.9.0")
    implementation("com.squareup.okhttp3:okhttp:4.9.3")
    implementation("com.google.code.gson:gson:2.10.1")
    // 其他相关依赖
}

同时，需要在AndroidManifest.xml中声明必要的权限，包括位置、蓝牙和网络权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
<uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />

权限申请是应用正常运行的前提，需要在运行时动态请求用户授权，确保SDK功能可用。

系统架构设计

整体架构

家庭位置共享系统采用三层架构设计：设备层、服务层和应用层。

层级	组件	功能描述
设备层	Rokid Glasses	位置信息显示、用户交互、传感器数据采集
设备层	Android手机	位置获取、数据处理、网络通信
服务层	位置服务	位置数据加密、存储、同步
服务层	通知服务	异常情况预警、消息推送
应用层	AR界面	3D位置可视化、家庭成员状态展示
应用层	管理后台	隐私设置、权限管理、历史记录查询

这种分层架构确保了系统的可扩展性和模块化，便于后续功能迭代。

数据流设计

系统数据流主要包括位置获取、处理、传输和展示四个环节：

位置获取：手机端通过GPS/网络定位获取精确位置
数据处理：对位置数据进行加密、压缩和格式化
数据传输：通过蓝牙将关键数据传输至眼镜，通过网络同步至服务器
数据展示：眼镜端接收数据后，在AR界面可视化展示

关键数据包括：经纬度坐标、时间戳、用户身份标识、状态信息（正常/异常）、电池状态等。所有位置数据均采用端到端加密，确保传输安全。

核心功能实现

设备连接模块

稳定可靠的设备连接是位置共享应用的基础。我们基于CXR-M SDK实现蓝牙和Wi-Fi双通道连接，确保在不同场景下都有良好的连接质量。

class FamilyGuardBluetoothHelper(
    private val context: Context,
    private val connectionCallback: (Boolean) -> Unit
) {
    private val bluetoothHelper = BluetoothHelper(context as AppCompatActivity, 
        { status -> 
            when(status) {
                BluetoothHelper.INIT_STATUS.INIT_END -> {
                    Log.d(TAG, "Bluetooth initialized successfully")
                    startDeviceScan()
                }
                else -> Log.d(TAG, "Bluetooth init status: $status")
            }
        },
        { 
            // Device found callback
            processDiscoveredDevices()
        }
    )
    
    private fun startDeviceScan() {
        bluetoothHelper.startScan()
    }
    
    private fun processDiscoveredDevices() {
        val glassesDevices = bluetoothHelper.scanResultMap.filter { 
            it.value.name?.contains("Glasses", ignoreCase = true) ?: false 
        }
        
        if (glassesDevices.isNotEmpty()) {
            val firstDevice = glassesDevices.values.first()
            initDeviceConnection(firstDevice)
        }
    }
    
    private fun initDeviceConnection(device: BluetoothDevice) {
        CxrApi.getInstance().initBluetooth(context, device, object : BluetoothStatusCallback {
            override fun onConnectionInfo(
                socketUuid: String?,
                macAddress: String?,
                rokidAccount: String?,
                glassesType: Int
            ) {
                socketUuid?.let { uuid ->
                    macAddress?.let { address ->
                        connectToDevice(uuid, address)
                    }
                }
            }
            
            override fun onConnected() {
                Log.d(TAG, "Bluetooth connected successfully")
                connectionCallback(true)
                initWifiConnection()
            }
            
            override fun onDisconnected() {
                Log.d(TAG, "Bluetooth disconnected")
                connectionCallback(false)
                reconnectToDevice()
            }
            
            override fun onFailed(errorCode: ValueUtil.CxrBluetoothErrorCode?) {
                Log.e(TAG, "Bluetooth connection failed: $errorCode")
                connectionCallback(false)
            }
        })
    }
    
    private fun initWifiConnection() {
        CxrApi.getInstance().initWifiP2P(object : WifiP2PStatusCallback {
            override fun onConnected() {
                Log.d(TAG, "Wi-Fi P2P connected successfully")
                // 启动位置数据同步服务
                startLocationSyncService()
            }
            
            override fun onDisconnected() {
                Log.d(TAG, "Wi-Fi P2P disconnected")
            }
            
            override fun onFailed(errorCode: ValueUtil.CxrWifiErrorCode?) {
                Log.e(TAG, "Wi-Fi P2P connection failed: $errorCode")
            }
        })
    }
    
    // 其他连接管理方法...
    
    companion object {
        private const val TAG = "FamilyGuardBluetooth"
    }
}

该模块实现了蓝牙设备扫描、连接建立、状态监听和自动重连功能。当蓝牙连接成功后，自动初始化Wi-Fi P2P连接，为后续大容量位置数据传输提供高速通道。

位置获取与处理模块

位置获取模块采用多源定位策略，结合GPS、WiFi和基站定位，确保在各种环境下都能获取精确位置：

class FamilyLocationManager(private val context: Context) {
    private val fusedLocationProviderClient = 
        LocationServices.getFusedLocationProviderClient(context)
    
    private val locationCallback = object : LocationCallback() {
        override fun onLocationResult(locationResult: LocationResult) {
            locationResult.locations.lastOrNull()?.let { location ->
                processLocationData(location)
            }
        }
    }
    
    fun startLocationUpdates() {
        val locationRequest = LocationRequest.Builder(
            Priority.PRIORITY_HIGH_ACCURACY, 5000 // 5 seconds interval
        ).build()
        
        val permissionStatus = ContextCompat.checkSelfPermission(
            context, Manifest.permission.ACCESS_FINE_LOCATION
        )
        
        if (permissionStatus == PackageManager.PERMISSION_GRANTED) {
            fusedLocationProviderClient.requestLocationUpdates(
                locationRequest,
                locationCallback,
                Looper.getMainLooper()
            )
        } else {
            // Request permission
            ActivityCompat.requestPermissions(
                context as Activity,
                arrayOf(Manifest.permission.ACCESS_FINE_LOCATION),
                LOCATION_PERMISSION_REQUEST_CODE
            )
        }
    }
    
    private fun processLocationData(location: Location) {
        val locationData = FamilyLocationData(
            userId = getCurrentUserId(),
            latitude = location.latitude,
            longitude = location.longitude,
            timestamp = System.currentTimeMillis(),
            accuracy = location.accuracy,
            batteryLevel = getBatteryLevel(),
            status = getUserStatus() // NORMAL, WARNING, EMERGENCY
        )
        
        // Encrypt location data
        val encryptedData = encryptLocationData(locationData)
        
        // Send to glasses via Bluetooth
        sendLocationToGlasses(encryptedData)
        
        // Sync to cloud server
        syncLocationToCloud(encryptedData)
    }
    
    private fun encryptLocationData(data: FamilyLocationData): ByteArray {
        try {
            val cipher = Cipher.getInstance("AES/GCM/NoPadding")
            val secretKey = getSecretKey() // Get from secure storage
            val iv = ByteArray(12)
            SecureRandom().nextBytes(iv)
            val gcmParameterSpec = GCMParameterSpec(128, iv)
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, gcmParameterSpec)
            val encrypted = cipher.doFinal(Gson().toJson(data).toByteArray())
            return iv + encrypted // Prepend IV to encrypted data
        } catch (e: Exception) {
            Log.e(TAG, "Encryption failed", e)
            return byteArrayOf()
        }
    }
    
    // Other methods for sending data and managing updates
    
    companion object {
        private const val TAG = "FamilyLocationManager"
        private const val LOCATION_PERMISSION_REQUEST_CODE = 1001
    }
}

该模块实现了高精度位置获取、数据加密和双通道传输功能。采用5秒的更新间隔平衡了实时性与电池消耗，并通过AES-GCM加密算法确保位置数据传输安全。

AR界面展示模块

AR界面是家庭位置共享应用的核心交互层，通过Rokid SDK的自定义页面功能实现：

class FamilyLocationARView(private val context: Context) {
    
    // Initial JSON configuration for the AR view
    private fun getInitialViewConfig(): String {
        return """
        {
          "type": "LinearLayout",
          "props": {
            "layout_width": "match_parent",
            "layout_height": "match_parent",
            "orientation": "vertical",
            "gravity": "center",
            "paddingTop": "20dp",
            "backgroundColor": "#88000000"
          },
          "children": [
            {
              "type": "TextView",
              "props": {
                "id": "tv_title",
                "layout_width": "wrap_content",
                "layout_height": "wrap_content",
                "text": "家庭守护",
                "textSize": "20sp",
                "textColor": "#FFFFFFFF",
                "textStyle": "bold",
                "marginBottom": "15dp"
              }
            },
            {
              "type": "RelativeLayout",
              "props": {
                "layout_width": "match_parent",
                "layout_height": "300dp",
                "backgroundColor": "#44000000",
                "marginStart": "15dp",
                "marginEnd": "15dp",
                "marginBottom": "15dp"
              },
              "children": [
                {
                  "type": "ImageView",
                  "props": {
                    "id": "iv_map_background",
                    "layout_width": "match_parent",
                    "layout_height": "match_parent",
                    "name": "map_background",
                    "scaleType": "center_crop"
                  }
                },
                {
                  "type": "TextView",
                  "props": {
                    "id": "tv_family_members",
                    "layout_width": "match_parent",
                    "layout_height": "wrap_content",
                    "layout_alignParentBottom": "true",
                    "padding": "10dp",
                    "textColor": "#FFFFFFFF",
                    "textSize": "14sp",
                    "backgroundColor": "#88000000"
                  }
                }
              ]
            },
            {
              "type": "LinearLayout",
              "props": {
                "layout_width": "match_parent",
                "layout_height": "wrap_content",
                "orientation": "horizontal",
                "gravity": "center"
              },
              "children": [
                {
                  "type": "ImageView",
                  "props": {
                    "id": "iv_refresh",
                    "layout_width": "40dp",
                    "layout_height": "40dp",
                    "name": "refresh_icon",
                    "layout_margin": "10dp"
                  }
                },
                {
                  "type": "ImageView",
                  "props": {
                    "id": "iv_settings",
                    "layout_width": "40dp",
                    "layout_height": "40dp",
                    "name": "settings_icon",
                    "layout_margin": "10dp"
                  }
                }
              ]
            }
          ]
        }
        """.trimIndent()
    }
    
    fun openARView() {
        val initialConfig = getInitialViewConfig()
        val status = CxrApi.getInstance().openCustomView(initialConfig)
        
        if (status == ValueUtil.CxrStatus.REQUEST_SUCCEED) {
            Log.d(TAG, "AR view opened successfully")
            // Send map icons and member status icons
            sendMapIcons()
        } else {
            Log.e(TAG, "Failed to open AR view: $status")
        }
    }
    
    private fun sendMapIcons() {
        val icons = listOf(
            IconInfo("map_background", loadBase64Image(R.drawable.family_map_background)),
            IconInfo("refresh_icon", loadBase64Image(R.drawable.ic_refresh)),
            IconInfo("settings_icon", loadBase64Image(R.drawable.ic_settings)),
            IconInfo("member_safe", loadBase64Image(R.drawable.ic_member_safe)),
            IconInfo("member_warning", loadBase64Image(R.drawable.ic_member_warning))
        )
        
        CxrApi.getInstance().sendCustomViewIcons(icons)
    }
    
    fun updateFamilyMembersDisplay(members: List<FamilyMember>) {
        val updates = mutableListOf<Map<String, Any>>()
        
        // Update family members text
        val membersText = members.joinToString("\n") { member ->
            val statusIcon = when(member.safetyStatus) {
                SafetyStatus.SAFE -> "✓"
                SafetyStatus.WARNING -> "⚠"
                SafetyStatus.EMERGENCY -> "❗"
                else -> "•"
            }
            "$statusIcon ${member.name}: ${member.locationName}"
        }
        
        updates.add(mapOf(
            "action" to "update",
            "id" to "tv_family_members",
            "props" to mapOf("text" to membersText)
        ))
        
        // Update timestamp
        val currentTime = SimpleDateFormat("HH:mm", Locale.getDefault()).format(Date())
        updates.add(mapOf(
            "action" to "update",
            "id" to "tv_title",
            "props" to mapOf("text" to "家庭守护 • $currentTime")
        ))
        
        // Send updates to glasses
        val updateJson = Gson().toJson(updates)
        CxrApi.getInstance().updateCustomView(updateJson)
    }
    
    private fun loadBase64Image(resourceId: Int): String {
        val drawable = ContextCompat.getDrawable(context, resourceId)
        val bitmap = (drawable as BitmapDrawable).bitmap
        val resizedBitmap = Bitmap.createScaledBitmap(bitmap, 128, 128, false)
        
        val byteArrayOutputStream = ByteArrayOutputStream()
        resizedBitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream)
        val byteArray = byteArrayOutputStream.toByteArray()
        return Base64.encodeToString(byteArray, Base64.DEFAULT)
    }
    
    companion object {
        private const val TAG = "FamilyLocationARView"
    }
}

该模块定义了AR界面的初始布局和动态更新机制。界面采用半透明背景设计，减少对用户视野的干扰，同时清晰展示家庭成员位置和状态信息。位置数据通过图标和文字结合的方式直观呈现，并支持实时刷新。

通知与预警系统

安全预警是家庭位置共享应用的核心价值。我们设计了多级预警机制，根据位置异常程度触发不同级别的通知：

class FamilySafetyMonitor {
    private val context: Context
    private val notificationManager: NotificationManager
    private val lastAlertTimes = mutableMapOf<String, Long>()
    
    init {
        this.context = context
        this.notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            createNotificationChannels()
        }
    }
    
    private fun createNotificationChannels() {
        val alertChannel = NotificationChannel(
            ALERT_CHANNEL_ID,
            "安全警报",
            NotificationManager.IMPORTANCE_HIGH
        ).apply {
            description = "家庭成员安全警报通知"
            enableLights(true)
            lightColor = Color.RED
            enableVibration(true)
            vibrationPattern = longArrayOf(0, 1000, 500, 1000)
        }
        
        val infoChannel = NotificationChannel(
            INFO_CHANNEL_ID,
            "位置更新",
            NotificationManager.IMPORTANCE_LOW
        ).apply {
            description = "家庭成员位置更新通知"
            enableLights(false)
            enableVibration(false)
        }
        
        notificationManager.createNotificationChannels(listOf(alertChannel, infoChannel))
    }
    
    fun checkLocationSafety(member: FamilyMember, currentLocation: Location) {
        when {
            isEmergencySituation(member, currentLocation) -> handleEmergency(member)
            isWarningSituation(member, currentLocation) -> handleWarning(member)
            else -> handleNormalUpdate(member)
        }
    }
    
    private fun isEmergencySituation(member: FamilyMember, location: Location): Boolean {
        // Check if member is in a dangerous area
        if (isInDangerZone(location)) return true
        
        // Check if member has deviated significantly from expected route
        if (member.expectedRoute != null && isFarFromRoute(location, member.expectedRoute)) {
            return true
        }
        
        // Check if battery is critically low and member is in unfamiliar area
        if (member.batteryLevel < 15 && !isFamiliarArea(location, member)) {
            return true
        }
        
        return false
    }
    
    private fun handleEmergency(member: FamilyMember) {
        // Send emergency notification to all family members
        sendEmergencyNotification(member)
        
        // Trigger glasses vibration and red alert display
        triggerGlassesAlert(member, AlertLevel.EMERGENCY)
        
        // Send emergency message with location to pre-set contacts
        sendEmergencySMS(member)
        
        // Log emergency event for later review
        logSafetyEvent(member, SafetyEventType.EMERGENCY)
    }
    
    private fun sendEmergencyNotification(member: FamilyMember) {
        val notification = NotificationCompat.Builder(context, ALERT_CHANNEL_ID)
            .setSmallIcon(R.drawable.ic_emergency)
            .setContentTitle("紧急警报: ${member.name}")
            .setContentText("${member.name}可能处于危险中，请立即联系！")
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setCategory(NotificationCompat.CATEGORY_ALARM)
            .setAutoCancel(true)
            .setFullScreenIntent(createEmergencyPendingIntent(member), true)
            .build()
        
        notificationManager.notify(member.id.hashCode(), notification)
        
        // Send to glasses
        sendAlertToGlasses(member.name, "紧急情况", AlertLevel.EMERGENCY)
    }
    
    private fun triggerGlassesAlert(member: FamilyMember, level: AlertLevel) {
        val alertConfig = when(level) {
            AlertLevel.WARNING -> """
                {
                  "action": "update",
                  "id": "tv_family_members",
                  "props": {
                    "textColor": "#FFFFAA00",
                    "text": "⚠ ${member.name}需要注意"
                  }
                }
            """.trimIndent()
            AlertLevel.EMERGENCY -> """
                {
                  "action": "update",
                  "id": "tv_family_members",
                  "props": {
                    "textColor": "#FFFF0000",
                    "text": "❗❗ ${member.name}紧急情况!!"
                  }
                }
            """.trimIndent()
        }
        
        CxrApi.getInstance().updateCustomView(alertConfig)
        
        // Make glasses vibrate
        triggerGlassesVibration(level.duration)
    }
    
    private fun triggerGlassesVibration(duration: Int) {
        // Send vibration command through SDK
        // This is a simplified example - actual implementation would use appropriate SDK methods
        val vibrationCommand = mapOf(
            "command" to "vibrate",
            "pattern" to when(duration) {
                1000 -> "short"
                3000 -> "medium"
                else -> "long"
            }
        )
        
        val jsonCommand = Gson().toJson(vibrationCommand)
        // Send command via appropriate SDK method
    }
    
    // Other methods for handling warnings and normal updates
    
    enum class AlertLevel(val duration: Int) {
        WARNING(1000),
        EMERGENCY(3000)
    }
    
    companion object {
        private const val ALERT_CHANNEL_ID = "family_alert_channel"
        private const val INFO_CHANNEL_ID = "family_info_channel"
    }
}

预警系统根据位置数据的异常程度触发不同级别的响应，从温和提醒到紧急警报逐级升级。系统考虑了多种危险情况，包括进入危险区域、偏离预定路线、低电量在陌生区域等，并采取相应的通知措施。

隐私与安全设计

位置数据涉及高度敏感的个人隐私，我们在设计中严格遵循"最小权限原则"和"端到端加密"原则：

class FamilyLocationSecurity {
    private val encryptionKey: ByteArray
    private val securePreferences: SharedPreferences
    
    init {
        // Generate or retrieve encryption key from Android KeyStore
        encryptionKey = generateOrRetrieveKey()
        securePreferences = context.getSharedPreferences("family_secure_prefs", Context.MODE_PRIVATE)
    }
    
    private fun generateOrRetrieveKey(): ByteArray {
        val keyStore = KeyStore.getInstance("AndroidKeyStore")
        keyStore.load(null)
        
        val keyAlias = "family_location_key"
        if (!keyStore.containsAlias(keyAlias)) {
            val keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore")
            val builder = KeyGenParameterSpec.Builder(
                keyAlias,
                KeyProperties.PURPOSE_ENCRYPT or KeyProperties.PURPOSE_DECRYPT
            )
            builder.setBlockModes(KeyProperties.BLOCK_MODE_GCM)
            builder.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
            builder.setKeySize(256)
            keyGenerator.init(builder.build())
            keyGenerator.generateKey()
        }
        
        val secretKeyEntry = keyStore.getEntry(keyAlias, null) as KeyStore.SecretKeyEntry
        return secretKeyEntry.secretKey.encoded
    }
    
    fun encryptLocationData(data: FamilyLocationData): ByteArray {
        val iv = ByteArray(12)
        SecureRandom().nextBytes(iv)
        
        val cipher = Cipher.getInstance("AES/GCM/NoPadding")
        val secretKeySpec = SecretKeySpec(encryptionKey, "AES")
        val gcmParams = GCMParameterSpec(128, iv)
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, gcmParams)
        
        val jsonData = Gson().toJson(data)
        val encryptedData = cipher.doFinal(jsonData.toByteArray())
        
        // Combine IV and encrypted data
        val result = ByteArray(iv.size + encryptedData.size)
        System.arraycopy(iv, 0, result, 0, iv.size)
        System.arraycopy(encryptedData, 0, result, iv.size, encryptedData.size)
        
        return result
    }
    
    fun decryptLocationData(encryptedData: ByteArray): FamilyLocationData? {
        if (encryptedData.size < 12) return null // Invalid data
        
        val iv = encryptedData.copyOfRange(0, 12)
        val actualEncryptedData = encryptedData.copyOfRange(12, encryptedData.size)
        
        val cipher = Cipher.getInstance("AES/GCM/NoPadding")
        val secretKeySpec = SecretKeySpec(encryptionKey, "AES")
        val gcmParams = GCMParameterSpec(128, iv)
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, gcmParams)
        
        return try {
            val decryptedBytes = cipher.doFinal(actualEncryptedData)
            val jsonData = String(decryptedBytes)
            Gson().fromJson(jsonData, FamilyLocationData::class.java)
        } catch (e: Exception) {
            Log.e(TAG, "Decryption failed", e)
            null
        }
    }
    
    fun getShareableLocationData(userId: String, requesterId: String): FamilyLocationData? {
        // Check if the requester has permission to view this user's location
        if (!hasLocationPermission(userId, requesterId)) {
            return null
        }
        
        // Get last known location with appropriate precision based on relationship
        return when (getLocationPrecision(userId, requesterId)) {
            LocationPrecision.EXACT -> getLastKnownLocation(userId)
            LocationPrecision.APPROXIMATE -> getApproximateLocation(userId)
            LocationPrecision.NEIGHBORHOOD -> getNeighborhoodLocation(userId)
        }
    }
    
    private fun hasLocationPermission(targetUserId: String, requesterId: String): Boolean {
        val permissions = securePreferences.getStringSet("$targetUserId_permissions", emptySet())
        return permissions?.contains(requesterId) ?: false
    }
    
    enum class LocationPrecision {
        EXACT,       // Exact coordinates (for immediate family members)
        APPROXIMATE, // Approximate area (200m radius)
        NEIGHBORHOOD // Neighborhood level (1km radius)
    }
    
    companion object {
        private const val TAG = "FamilyLocationSecurity"
    }
}

隐私保护机制包括数据加密、权限控制和精度分级。系统根据家庭成员关系动态调整位置精度，确保敏感数据只对需要的人可见。所有位置数据在传输和存储过程中均采用端到端加密，即使服务器被攻破，攻击者也无法获取明文位置信息。

性能优化与电池管理

位置共享应用需要在实时性和电池消耗之间取得平衡。我们实现了多项优化策略：

class FamilyLocationOptimizer {
    private val context: Context
    private val locationUpdateIntervals = mutableMapOf<String, Long>()
    private val batteryLevelThresholds = mapOf(
        0.2f to 60000L,   // Below 20% battery, update every 60 seconds
        0.4f to 30000L,   // Below 40% battery, update every 30 seconds
        1.0f to 10000L    // Normal battery, update every 10 seconds
    )
    
    fun getOptimalUpdateInterval(userId: String): Long {
        val batteryLevel = getBatteryLevel()
        var interval = 10000L // Default 10 seconds
        
        // Adjust based on battery level
        for ((threshold, thresholdInterval) in batteryLevelThresholds) {
            if (batteryLevel < threshold) {
                interval = max(interval, thresholdInterval)
                break
            }
        }
        
        // Adjust based on user activity
        if (isUserStationary(userId)) {
            interval = max(interval, 60000L) // If stationary, update every 60 seconds
        }
        
        // Adjust based on time of day
        if (isNightTime()) {
            interval = max(interval, 120000L) // At night, update every 2 minutes
        }
        
        // Store and return
        locationUpdateIntervals[userId] = interval
        return interval
    }
    
    private fun getBatteryLevel(): Float {
        val batteryIntent = context.registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
        val level = batteryIntent?.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) ?: -1
        val scale = batteryIntent?.getIntExtra(BatteryManager.EXTRA_SCALE, -1) ?: -1
        
        return if (level == -1 || scale == -1) {
            1.0f // Default to full battery if unable to determine
        } else {
            level.toFloat() / scale.toFloat()
        }
    }
    
    private fun isUserStationary(userId: String): Boolean {
        val lastTwoLocations = getLocationHistory(userId, 2)
        if (lastTwoLocations.size < 2) return false
        
        val distance = calculateDistance(
            lastTwoLocations[0].latitude, lastTwoLocations[0].longitude,
            lastTwoLocations[1].latitude, lastTwoLocations[1].longitude
        )
        
        return distance < 50 // Less than 50 meters movement
    }
    
    private fun isNightTime(): Boolean {
        val calendar = Calendar.getInstance()
        val hour = calendar.get(Calendar.HOUR_OF_DAY)
        return hour < 6 || hour > 22 // Consider 10 PM to 6 AM as night time
    }
    
    fun optimizeDataTransfer(data: ByteArray): ByteArray {
        // Apply compression to reduce data size
        val compressed = compressData(data)
        
        // For battery saving, skip sending if data hasn't changed significantly
        if (shouldSkipUpdate(compressed)) {
            return byteArrayOf()
        }
        
        return compressed
    }
    
    private fun compressData(data: ByteArray): ByteArray {
        val byteArrayOutputStream = ByteArrayOutputStream()
        val deflater = Deflater(Deflater.BEST_SPEED)
        val deflaterOutputStream = DeflaterOutputStream(byteArrayOutputStream, deflater)
        
        try {
            deflaterOutputStream.write(data)
            deflaterOutputStream.finish()
            return byteArrayOutputStream.toByteArray()
        } finally {
            deflaterOutputStream.close()
            byteArrayOutputStream.close()
        }
    }
    
    private fun shouldSkipUpdate(data: ByteArray): Boolean {
        val userId = getCurrentUserId()
        val lastSentData = getLastSentData(userId)
        
        if (lastSentData == null) return false
        
        // Calculate similarity between current and last data
        val similarity = calculateDataSimilarity(data, lastSentData)
        
        // Skip update if data is too similar (95% similarity threshold)
        return similarity > 0.95
    }
    
    // Other optimization methods
    
    companion object {
        private const val TAG = "FamilyLocationOptimizer"
    }
}

性能优化策略包括：

动态调整位置更新频率，根据电池水平、用户活动状态和时间自动调节
数据压缩减少传输量，降低网络和蓝牙带宽消耗
智能更新跳过机制，当位置变化不大时跳过更新
夜间模式降低更新频率，减少对睡眠的干扰
优先级管理，紧急通知优先于常规位置更新

这些优化使应用在保证功能的同时，将电池消耗降至最低，提升用户体验。

未来展望与扩展

家庭位置共享应用未来可朝以下方向拓展与升级：

多模态交互：结合Rokid眼镜的语音识别功能，用户可通过自然语言进行查询，例如直接询问“小R，妈妈在哪里？”实现更直观的交互体验。
情境感知：通过接入日历等个人信息，系统可自动识别用户当前情境（如上学或上班路线），从而减少误报，提供更贴合实际的位置服务。
健康监测集成：融合心率、步数等健康数据，对家庭成员状态进行更全面的监测，在位置共享的基础上增强对成员身心状态的关注。
紧急求助功能：支持通过双击Rokid眼镜侧边按钮快速触发求助，自动将当前位置发送给预设联系人，为紧急情况提供及时响应。
社区安全网络：用户可匿名分享区域安全信息，共同构建实时更新的社区级安全地图，增强群体安全意识与联防能力。

随着Rokid SDK的持续迭代，未来将逐步支持更丰富的AR交互方式与更高精度的室内定位技术，进一步提升应用的功能深度与实用价值。

写在最后

我们基于Rokid CXR-M SDK，开发了一款面向家庭成员的位置共享应用，通过手机与AI眼镜的协同交互，实现了安全、便捷且低干扰的家庭守护体验。系统充分运用了SDK提供的蓝牙/Wi-Fi双通道连接、自定义AR界面与高效数据传输等核心能力，并在隐私保护、性能优化与用户体验方面进行了深入设计。

该应用不仅有效改善了传统位置共享应用的使用痛点，更通过AR技术重塑交互方式：将位置信息自然融入用户视野，无需频繁操作手机，真正做到了“无感守护”。在技术实现层面，我们注重代码质量与架构清晰，采用模块化开发策略，确保系统具备良好的可维护性与扩展性。

随着智能穿戴设备的普及，AR技术在家庭安全领域展现出广阔前景。本项目的成功实践，验证了Rokid眼镜在该场景下的应用潜力，也为后续开发者提供了有价值的参考。技术之温度，在于服务于人，而家庭安全正是技术最具温情的落点之一。我们相信，通过持续的技术创新与人文关怀，智能设备将为每一个家庭带来更安心、更便捷的生活体验。

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