The index implementation for face unlock settings.

- Index the delete face unlock preference and set up face unlock preference.

Fixes: 147031175
Test: manual
Change-Id: Ia984a116947d0c2e6a909f53914d081e25496f87

res/xml/security_settings_face.xml

@@ -71,14 +71,16 @@
         android:title="@string/security_settings_face_preference_title">
         <com.android.settingslib.widget.LayoutPreference
             android:key="security_settings_face_delete_faces_container"
+            android:title="@string/security_settings_face_settings_remove_face_data"
             android:selectable="false"
             android:layout="@layout/face_remove_button"
             settings:allowDividerBelow="true"/>
 
         <com.android.settingslib.widget.LayoutPreference
             android:key="security_settings_face_enroll_faces_container"
+            android:title="@string/security_settings_face_settings_enroll"
             android:selectable="false"
-            android:layout="@layout/face_enroll_button "
+            android:layout="@layout/face_enroll_button"
             settings:allowDividerBelow="true"/>
     </PreferenceCategory>
 

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

@@ -56,6 +56,11 @@ public class FaceSettings extends DashboardFragment {
     private static final String TAG = "FaceSettings";
     private static final String KEY_TOKEN = "hw_auth_token";
 
+    private static final String PREF_KEY_DELETE_FACE_DATA =
+            "security_settings_face_delete_faces_container";
+    private static final String PREF_KEY_ENROLL_FACE_UNLOCK =
+            "security_settings_face_enroll_faces_container";
+
     private UserManager mUserManager;
     private FaceManager mFaceManager;
     private int mUserId;
@@ -309,6 +314,15 @@ public class FaceSettings extends DashboardFragment {
                 protected boolean isPageSearchEnabled(Context context) {
                     return isAvailable(context);
                 }
-            };
 
+                @Override
+                public List<String> getNonIndexableKeys(Context context) {
+                    final List<String> keys = super.getNonIndexableKeys(context);
+                    final FaceManager faceManager = context.getSystemService(FaceManager.class);
+                    final boolean hasEnrolled = faceManager.hasEnrolledTemplates(
+                            UserHandle.myUserId());
+                    keys.add(hasEnrolled ? PREF_KEY_ENROLL_FACE_UNLOCK : PREF_KEY_DELETE_FACE_DATA);
+                    return keys;
+                }
+            };
 }