优化UI

app/src/main/java/com/example/defenseapplication/login/FaceVerificationActivity.kt

@@ -4,8 +4,10 @@ import android.Manifest
 import android.content.pm.PackageManager
 import android.os.Bundle
 import android.widget.Toast
+import androidx.annotation.OptIn
 import androidx.appcompat.app.AppCompatActivity
 import androidx.camera.core.CameraSelector
+import androidx.camera.core.ExperimentalGetImage
 import androidx.camera.core.ImageAnalysis
 import androidx.camera.core.Preview
 import androidx.camera.lifecycle.ProcessCameraProvider
@@ -38,6 +40,9 @@ class FaceVerificationActivity : AppCompatActivity() {
             .statusBarDarkFont(true)
             .titleBar(binding.topContainer)
             .init()
+        binding.backIcon.setOnClickListener {
+            finish()
+        }
         // 初始化人脸检测器（选项可自行调整）
         val options = FaceDetectorOptions.Builder()
             .setPerformanceMode(FaceDetectorOptions.PERFORMANCE_MODE_FAST)
@@ -65,6 +70,7 @@ class FaceVerificationActivity : AppCompatActivity() {
         }
     }
 
+    @OptIn(ExperimentalGetImage::class)
     private fun startCamera() {
         val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
         cameraProviderFuture.addListener({
@@ -81,8 +87,8 @@ class FaceVerificationActivity : AppCompatActivity() {
                 .build()
             imageAnalysis.setAnalyzer(cameraExecutor, FaceAnalyzer(faceDetector, binding.overlay))
 
-            // 选择后置摄像头
-            val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
+            // 选择前置摄像头
+            val cameraSelector = CameraSelector.DEFAULT_FRONT_CAMERA
 
             // 绑定到生命周期
             cameraProvider.bindToLifecycle(this, cameraSelector, preview, imageAnalysis)