Launch multiple biometric enrollment when no biometric is enrolled

When a user clicks the biometric item in the Device unlock page and no
biometric is enrolled:
- Fingerint clicked: Launch fingerprint enroll then face enroll.
- Face clicked: Launch face enroll then fingerprint enroll.

Bug: 370940762
Test: atest FaceSafetySourceTest FingerprintSafetySourceTest
Flag: com.android.settings.flags.biometrics_onboarding_education
Change-Id: I874b96a75ec0c126ae1674bb6ab220a0a8533fcd

src/com/android/settings/safetycenter/BiometricSourcesUtils.java

@@ -19,11 +19,15 @@ package com.android.settings.safetycenter;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
+import android.hardware.face.FaceManager;
+import android.hardware.fingerprint.FingerprintManager;
 import android.safetycenter.SafetyEvent;
 import android.safetycenter.SafetySourceData;
 import android.safetycenter.SafetySourceIssue;
 import android.safetycenter.SafetySourceStatus;
 
+import com.android.settings.Utils;
+
 /** Static helpers for setting SafetyCenter data for biometric safety sources. */
 public final class BiometricSourcesUtils {
 
@@ -89,6 +93,15 @@ public final class BiometricSourcesUtils {
                 .setSafetySourceData(context, safetySourceId, safetySourceData, safetyEvent);
     }
 
+    /** Check whether the multiple biometrics enrollment is needed. */
+    public static boolean isMultipleBiometricsEnrollmentNeeded(Context context, int userId) {
+        FaceManager faceManager = Utils.getFaceManagerOrNull(context);
+        FingerprintManager fingerprintManager = Utils.getFingerprintManagerOrNull(context);
+        return Utils.isMultipleBiometricsSupported(context)
+                && !faceManager.hasEnrolledTemplates(userId)
+                && !fingerprintManager.hasEnrolledFingerprints(userId);
+    }
+
     /** Helper method for creating a pending intent. */
     public static PendingIntent createPendingIntent(
             Context context, Intent intent, int requestCode) {