修复：无摄像头设备闪光崩溃 #749

app/src/main/kotlin/cn/ppps/forwarder/service/ForegroundService.kt

@@ -112,7 +112,7 @@ class ForegroundService : Service() {
             vibrationUtils.stopVibration()
         }
         //停止闪光灯
-        if (flashUtils.isFlashing) {
+        if (::flashUtils.isInitialized && flashUtils.isFlashing) {
             flashUtils.stopFlashing()
         }
         //停止播放音乐
@@ -192,7 +192,7 @@ class ForegroundService : Service() {
                 vibrationUtils.startVibration(alarm.vibrate, alarm.repeatTimes)
             }
             //闪光灯提醒
-            if (alarm.flashTimes >= 0) {
+            if (alarm.flashTimes >= 0 && ::flashUtils.isInitialized && flashUtils.isFlashSupported) {
                 isFlash = true
                 flashUtils.startFlashing(alarm.flash, alarm.flashTimes)
             }
@@ -252,7 +252,9 @@ class ForegroundService : Service() {
     override fun onDestroy() {
         //非纯客户端模式
         if (!SettingUtils.enablePureClientMode) stopForegroundService()
-        flashUtils.release()
+        if (::flashUtils.isInitialized) {
+            flashUtils.release()
+        }
         super.onDestroy()
     }
 
@@ -337,7 +339,7 @@ class ForegroundService : Service() {
                 vibrationUtils.stopVibration()
             }
             //停止闪光灯
-            if (flashUtils.isFlashing) {
+            if (::flashUtils.isInitialized && flashUtils.isFlashing) {
                 flashUtils.stopFlashing()
             }
         } catch (e: Exception) {

app/src/main/kotlin/cn/ppps/forwarder/utils/FlashUtils.kt

@@ -4,6 +4,7 @@ package cn.ppps.forwarder.utils
 
 import android.content.Context
 import android.hardware.Camera
+import android.hardware.camera2.CameraCharacteristics
 import android.hardware.camera2.CameraAccessException
 import android.hardware.camera2.CameraManager
 import android.os.Build
@@ -17,6 +18,8 @@ class FlashUtils(context: Context) {
     private var legacyParams: Camera.Parameters? = null
     private var handler: Handler? = null
     private val duration = 100L // 闪烁持续时间
+    var isFlashSupported = false
+        private set
     var isFlashing = false
         private set
 
@@ -24,16 +27,28 @@ class FlashUtils(context: Context) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             cameraManager = context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
             try {
-                cameraId = cameraManager?.cameraIdList?.get(0) // 获取后置摄像头 ID
+                val manager = cameraManager
+                cameraId = manager?.cameraIdList?.firstOrNull { id ->
+                    manager.getCameraCharacteristics(id).get(CameraCharacteristics.FLASH_INFO_AVAILABLE) == true
+                }
+                isFlashSupported = cameraId != null
             } catch (e: CameraAccessException) {
                 e.printStackTrace()
+                isFlashSupported = false
             }
         } else {
             try {
                 legacyCamera = Camera.open()
                 legacyParams = legacyCamera?.parameters
+                isFlashSupported = legacyParams?.supportedFlashModes?.contains(Camera.Parameters.FLASH_MODE_TORCH) == true
+                if (!isFlashSupported) {
+                    legacyCamera?.release()
+                    legacyCamera = null
+                    legacyParams = null
+                }
             } catch (e: Exception) {
                 e.printStackTrace()
+                isFlashSupported = false
             }
         }
     }
@@ -44,11 +59,13 @@ class FlashUtils(context: Context) {
      * @param repeatTimes 闪烁的重复次数，0 表示无限循环
      */
     fun startFlashing(pattern: String, repeatTimes: Int) {
-        if (isFlashing) return
+        if (!isFlashSupported || isFlashing || repeatTimes < 0 || pattern.isEmpty()) return
+
+        val sequence = pattern.filter { it == 'X' || it == 'O' || it == '1' || it == '0' }.toCharArray()
+        if (sequence.isEmpty()) return
+
         isFlashing = true
         handler = Handler(Looper.getMainLooper())
-
-        val sequence = pattern.toCharArray()
         var index = 0
         var repeatCount = 0
 
@@ -89,10 +106,14 @@ class FlashUtils(context: Context) {
      * 设置闪光灯状态，兼容 Android 4.4+
      */
     private fun setFlashlight(enable: Boolean) {
+        if (!isFlashSupported) return
+
         try {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-                cameraManager?.setTorchMode(cameraId!!, enable)
+                val currentCameraId = cameraId ?: return
+                cameraManager?.setTorchMode(currentCameraId, enable)
             } else {
+                if (legacyCamera == null || legacyParams == null) return
                 legacyParams?.flashMode = if (enable) Camera.Parameters.FLASH_MODE_TORCH else Camera.Parameters.FLASH_MODE_OFF
                 legacyCamera?.parameters = legacyParams
                 if (enable) legacyCamera?.startPreview() else legacyCamera?.stopPreview()
@@ -106,6 +127,7 @@ class FlashUtils(context: Context) {
      * 释放旧 API 资源
      */
     fun release() {
+        stopFlashing()
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
             legacyCamera?.stopPreview()
             legacyCamera?.release()