Use the internal max faces number to check enrolled.

Test: manually tested on device
Test: robotest for FaceEnrollIntroductionTest
Bug: 243759589
Change-Id: I193c7b7c49f884541bd5d8282d15bf69e46f3392

src/com/android/settings/biometrics/face/FaceEnrollIntroduction.java

@@ -26,7 +26,6 @@ import android.content.Intent;
 import android.hardware.SensorPrivacyManager;
 import android.hardware.biometrics.BiometricAuthenticator;
 import android.hardware.face.FaceManager;
-import android.hardware.face.FaceSensorPropertiesInternal;
 import android.os.Bundle;
 import android.text.Html;
 import android.text.method.LinkMovementMethod;
@@ -56,8 +55,6 @@ import com.google.android.setupcompat.template.FooterButton;
 import com.google.android.setupcompat.util.WizardManagerHelper;
 import com.google.android.setupdesign.span.LinkSpan;
 
-import java.util.List;
-
 /**
  * Provides introductory info about face unlock and prompts the user to agree before starting face
  * enrollment.
@@ -311,20 +308,12 @@ public class FaceEnrollIntroduction extends BiometricEnrollIntroduction {
     }
 
     private boolean maxFacesEnrolled() {
-        final boolean isSetupWizard = WizardManagerHelper.isAnySetupWizard(getIntent());
         if (mFaceManager != null) {
-            final List<FaceSensorPropertiesInternal> props =
-                    mFaceManager.getSensorPropertiesInternal();
             // This will need to be updated for devices with multiple face sensors.
-            final int max = props.get(0).maxEnrollmentsPerUser;
             final int numEnrolledFaces = mFaceManager.getEnrolledFaces(mUserId).size();
-            final int maxFacesEnrollableIfSUW = getApplicationContext().getResources()
+            final int maxFacesEnrollable = getApplicationContext().getResources()
                     .getInteger(R.integer.suw_max_faces_enrollable);
-            if (isSetupWizard) {
+            return numEnrolledFaces >= maxFacesEnrollable;
-                return numEnrolledFaces >= maxFacesEnrollableIfSUW;
-            } else {
-                return numEnrolledFaces >= max;
-            }
         } else {
             return false;
         }

tests/robotests/src/com/android/settings/biometrics/face/FaceEnrollIntroductionTest.java

@@ -22,13 +22,16 @@ import static com.google.common.truth.Truth.assertWithMessage;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.when;
 
 import android.content.Intent;
+import android.hardware.face.Face;
 import android.hardware.face.FaceManager;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
+import com.android.settings.R;
 import com.android.settings.biometrics.BiometricUtils;
 import com.android.settings.password.ChooseLockSettingsHelper;
 import com.android.settings.testutils.shadow.ShadowLockPatternUtils;
@@ -47,6 +50,9 @@ import org.robolectric.android.controller.ActivityController;
 import org.robolectric.annotation.Config;
 import org.robolectric.shadows.ShadowActivity;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @RunWith(RobolectricTestRunner.class)
 @Config(shadows = {
         ShadowLockPatternUtils.class,
@@ -77,6 +83,34 @@ public class FaceEnrollIntroductionTest {
         mActivity.mOverrideFaceManager = mFaceManager;
     }
 
+    private void setFaceManagerToHave(int numEnrollments) {
+        List<Face> faces = new ArrayList<>();
+        for (int i = 0; i < numEnrollments; i++) {
+            faces.add(new Face("Face " + i /* name */, 1 /*faceId */, 1 /* deviceId */));
+        }
+        when(mFaceManager.getEnrolledFaces(anyInt())).thenReturn(faces);
+    }
+
+    @Test
+    public void intro_CheckCanEnroll() {
+        setFaceManagerToHave(0 /* numEnrollments */);
+        setupActivity(new Intent());
+        mController.create();
+        int result = mActivity.checkMaxEnrolled();
+
+        assertThat(result).isEqualTo(0);
+    }
+
+    @Test
+    public void intro_CheckMaxEnrolled() {
+        setFaceManagerToHave(1 /* numEnrollments */);
+        setupActivity(new Intent());
+        mController.create();
+        int result = mActivity.checkMaxEnrolled();
+
+        assertThat(result).isEqualTo(R.string.face_intro_error_max);
+    }
+
     @Test
     public void testOnCreate() {
         setupActivity(new Intent());