diff --git a/core/java/android/service/watchdog/ExplicitHealthCheckService.java b/core/java/android/service/watchdog/ExplicitHealthCheckService.java
index 49e00d6..7befbfb 100644
--- a/core/java/android/service/watchdog/ExplicitHealthCheckService.java
+++ b/core/java/android/service/watchdog/ExplicitHealthCheckService.java
@@ -151,7 +151,7 @@
      */
     @NonNull public abstract List<String> onGetRequestedPackages();
 
-    private final Handler mHandler = new Handler(Looper.getMainLooper(), null, true);
+    private final Handler mHandler = Handler.createAsync(Looper.getMainLooper());
     @Nullable private RemoteCallback mCallback;
 
     @Override
diff --git a/services/core/java/com/android/server/ExplicitHealthCheckController.java b/services/core/java/com/android/server/ExplicitHealthCheckController.java
index 20de40e..3d610d3 100644
--- a/services/core/java/com/android/server/ExplicitHealthCheckController.java
+++ b/services/core/java/com/android/server/ExplicitHealthCheckController.java
@@ -343,7 +343,7 @@
             };
 
             mContext.bindServiceAsUser(intent, mConnection,
-                    Context.BIND_AUTO_CREATE, UserHandle.of(UserHandle.USER_SYSTEM));
+                    Context.BIND_AUTO_CREATE, UserHandle.SYSTEM);
             Slog.i(TAG, "Explicit health check service is bound");
         }
     }
diff --git a/services/core/java/com/android/server/RescueParty.java b/services/core/java/com/android/server/RescueParty.java
index 6e2e5f7..eb65b2a 100644
--- a/services/core/java/com/android/server/RescueParty.java
+++ b/services/core/java/com/android/server/RescueParty.java
@@ -514,7 +514,8 @@
         Exception res = null;
         final ContentResolver resolver = context.getContentResolver();
         try {
-            Settings.Global.resetToDefaultsAsUser(resolver, null, mode, UserHandle.USER_SYSTEM);
+            Settings.Global.resetToDefaultsAsUser(resolver, null, mode,
+                UserHandle.SYSTEM.getIdentifier());
         } catch (Exception e) {
             res = new RuntimeException("Failed to reset global settings", e);
         }
@@ -771,12 +772,13 @@
     }
 
     private static int[] getAllUserIds() {
-        int[] userIds = { UserHandle.USER_SYSTEM };
+        int systemUserId = UserHandle.SYSTEM.getIdentifier();
+        int[] userIds = { systemUserId };
         try {
             for (File file : FileUtils.listFilesOrEmpty(Environment.getDataSystemDeDirectory())) {
                 try {
                     final int userId = Integer.parseInt(file.getName());
-                    if (userId != UserHandle.USER_SYSTEM) {
+                    if (userId != systemUserId) {
                         userIds = ArrayUtils.appendInt(userIds, userId);
                     }
                 } catch (NumberFormatException ignored) {