Fix photo error reporting and add detailed logging

app/src/main/java/com/example/app/SimpleCameraActivity.kt

@@ -43,6 +43,11 @@ class SimpleCameraActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_simple_camera)
         
+        // 记录应用启动信息
+        Log.d(TAG, "SimpleCameraActivity 启动")
+        Log.d(TAG, "Android SDK: ${Build.VERSION.SDK_INT}")
+        Log.d(TAG, "设备型号: ${Build.MODEL}")
+
         // 初始化视图
         viewFinder = findViewById(R.id.viewFinder)
         captureButton = findViewById(R.id.captureButton)
@@ -52,15 +57,20 @@ class SimpleCameraActivity : AppCompatActivity() {
 
         // 请求权限
         if (allPermissionsGranted()) {
+            Log.d(TAG, "权限已授予，启动相机")
             startCamera()
         } else {
+            Log.d(TAG, "请求相机权限")
             ActivityCompat.requestPermissions(
                 this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS
             )
         }
 
         // 设置拍照按钮点击监听器
-        captureButton.setOnClickListener { takePhoto() }
+        captureButton.setOnClickListener { 
+            Log.d(TAG, "拍照按钮被点击")
+            takePhoto() 
+        }
     }
 
     override fun onDestroy() {
@@ -139,20 +149,48 @@ class SimpleCameraActivity : AppCompatActivity() {
             object : ImageCapture.OnImageSavedCallback {
                 override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
                     val savedUri = outputFileResults.savedUri
-                    val msg = if (savedUri != null) {
+                    if (savedUri != null) {
-                        "照片已保存: ${savedUri.lastPathSegment}"
+                        val msg = "照片已保存: ${savedUri.lastPathSegment}"
-                    } else {
-                        "照片保存成功"
-                    }
                         Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
                         Log.d(TAG, msg)
+                        
+                        // 验证文件是否真的存在
+                        try {
+                            val cursor = contentResolver.query(savedUri, null, null, null, null)
+                            if (cursor != null && cursor.moveToFirst()) {
+                                Log.d(TAG, "文件验证成功: ${savedUri}")
+                            } else {
+                                Log.w(TAG, "文件验证失败，但onImageSaved被调用: ${savedUri}")
+                            }
+                            cursor?.close()
+                        } catch (e: Exception) {
+                            Log.e(TAG, "文件验证异常: ${e.message}")
+                        }
+                    } else {
+                        Log.w(TAG, "onImageSaved被调用但savedUri为null")
+                        Toast.makeText(baseContext, "照片保存完成", Toast.LENGTH_SHORT).show()
+                    }
                 }
 
                 override fun onError(exception: ImageCaptureException) {
-                    Log.e(TAG, "拍照失败: ${exception.message}", exception)
+                    val errorMsg = "拍照失败: ${exception.message}"
+                    Log.e(TAG, errorMsg, exception)
+                    
+                    // 检查错误类型
+                    when (exception.imageCaptureError) {
+                        ImageCapture.ERROR_CAMERA_CLOSED -> 
+                            Toast.makeText(baseContext, "相机已关闭", Toast.LENGTH_LONG).show()
+                        ImageCapture.ERROR_FILE_IO -> 
+                            Toast.makeText(baseContext, "文件保存失败", Toast.LENGTH_LONG).show()
+                        ImageCapture.ERROR_INVALID_CAMERA -> 
+                            Toast.makeText(baseContext, "无效的相机", Toast.LENGTH_LONG).show()
+                        ImageCapture.ERROR_UNKNOWN -> 
+                            Toast.makeText(baseContext, "未知错误", Toast.LENGTH_LONG).show()
+                        else -> 
                             Toast.makeText(baseContext, "拍照失败: ${exception.message}", Toast.LENGTH_LONG).show()
                     }
                 }
+            }
         )
     }