fix(camera): 修复检查活动中相机预览启动逻辑

- 添加了 previewStartAttempted 标志防止重复启动相机预览
- 在多个关键位置增加了调试日志用于追踪相机状态
- 优化了相机预览可用性检测和启动时机
- 修复了相机预览启动失败后的状态重置逻辑
- 改进了相机预览启动时的 UI 可见性控制
- 添加了相机预览停止时的异常处理机制

app/src/main/java/com/nova/brain/glass/ui/InspectionActivity.kt

@@ -41,10 +41,12 @@ class InspectionActivity :
     private var isPreviewActive = false
     private var currentZoomLevel = 1
     private var maxZoomLevel = 1
+    private var previewStartAttempted = false
 
     private val listener = object : OfflineCmdListener {
         override fun onOfflineCmd(cmd: String) {
             runOnUiThread {
+                LogHelper.d("InspectionActivity onOfflineCmd: $cmd")
                 when (cmd) {
                     "退出", "返回", "退回" -> finish()
                     "开始", "开始任务" -> startCapture()
@@ -93,6 +95,7 @@ class InspectionActivity :
 
     private val previewTextureListener = object : TextureView.SurfaceTextureListener {
         override fun onSurfaceTextureAvailable(surface: android.graphics.SurfaceTexture, width: Int, height: Int) {
+            LogHelper.d("Inspection preview surface available: ${width}x$height, requested=$isPreviewRequested")
             if (isPreviewRequested) {
                 startCameraPreview()
             }
@@ -169,27 +172,43 @@ class InspectionActivity :
             capturePhoto()
             return
         }
+        LogHelper.d("Inspection startCapture: previewActive=$isPreviewActive, textureAvailable=${binding.cameraPreview.isAvailable}")
         binding.hint.text = "相机预览启动中，请稍后..."
         isPreviewRequested = true
+        previewStartAttempted = false
         SprayingPhotoManager.clear()
+        binding.cameraPreviewContainer.visibility = View.VISIBLE
+        binding.zoomText.visibility = View.VISIBLE
         if (binding.cameraPreview.isAvailable) {
             startCameraPreview()
         } else {
-            binding.cameraPreviewContainer.visibility = View.VISIBLE
-            binding.zoomText.visibility = View.VISIBLE
+            binding.cameraPreview.post {
+                LogHelper.d("Inspection preview post check: textureAvailable=${binding.cameraPreview.isAvailable}, requested=$isPreviewRequested")
+                if (isPreviewRequested && binding.cameraPreview.isAvailable) {
+                    startCameraPreview()
+                }
+            }
         }
     }
 
     private fun startCameraPreview() {
+        if (!isPreviewRequested || previewStartAttempted) {
+            LogHelper.d("Inspection startCameraPreview skipped: requested=$isPreviewRequested attempted=$previewStartAttempted")
+            return
+        }
         val surfaceTexture = binding.cameraPreview.surfaceTexture ?: return
+        previewStartAttempted = true
         val surface = Surface(surfaceTexture)
+        LogHelper.d("Inspection startCameraPreview invoke startCameraShare")
         runCatching {
             GlassMediaServiceHelper.startCameraShare(surface, cameraSurfaceCallback)
         }.onFailure {
             isPreviewRequested = false
+            previewStartAttempted = false
             binding.cameraPreviewContainer.visibility = View.GONE
             binding.zoomText.visibility = View.GONE
             binding.hint.text = "相机预览启动失败，请重试"
+            LogHelper.e("Inspection startCameraPreview failed: ${it.message}", it)
             (it.message ?: "相机预览启动失败").showMessage()
         }
     }
@@ -197,8 +216,12 @@ class InspectionActivity :
     private fun stopCameraPreview() {
         isPreviewRequested = false
         isPreviewActive = false
+        previewStartAttempted = false
+        LogHelper.d("Inspection stopCameraPreview")
         runCatching {
             GlassMediaServiceHelper.stopCameraShare(cameraSurfaceCallback)
+        }.onFailure {
+            LogHelper.e("Inspection stopCameraPreview failed: ${it.message}", it)
         }
         binding.cameraPreviewContainer.visibility = View.GONE
         binding.zoomText.visibility = View.GONE