Merge "Ensure getUserName cannot return null" into tm-dev am: 1503b56202

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18126297

Change-Id: Id4c754cbba26b3774ad525b0aaccbec064c1df09
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

core/api/test-current.txt

@@ -919,7 +919,7 @@ package android.content.pm {
     field public int id;
     field public String lastLoggedInFingerprint;
     field public long lastLoggedInTime;
-    field public String name;
+    field @Nullable public String name;
     field public boolean partial;
     field public boolean preCreated;
     field public int profileBadge;

core/java/android/content/pm/UserInfo.java

@@ -18,6 +18,7 @@ package android.content.pm;
 
 import android.annotation.IntDef;
 import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.annotation.TestApi;
 import android.annotation.UserIdInt;
 import android.compat.annotation.UnsupportedAppUsage;
@@ -170,7 +171,7 @@ public class UserInfo implements Parcelable {
     @UnsupportedAppUsage
     public int serialNumber;
     @UnsupportedAppUsage
-    public String name;
+    public @Nullable String name;
     @UnsupportedAppUsage
     public String iconPath;
     @UnsupportedAppUsage

core/java/android/os/UserManager.java

@@ -2179,7 +2179,10 @@ public class UserManager {
             }
         } else {
             UserInfo userInfo = getUserInfo(mUserId);
-            return userInfo == null ? "" : userInfo.name;
+            if (userInfo != null && userInfo.name != null) {
+                return userInfo.name;
+            }
+            return "";
         }
     }
 

services/core/java/com/android/server/pm/UserManagerService.java

@@ -1430,6 +1430,8 @@ public class UserManagerService extends IUserManager.Stub {
     /**
      * Returns a UserInfo object with the name filled in, for Owner and Guest, or the original
      * if the name is already set.
+     *
+     * Note: Currently, the resulting name can be null if a user was truly created with a null name.
      */
     private UserInfo userWithName(UserInfo orig) {
         if (orig != null && orig.name == null) {
@@ -1638,7 +1640,7 @@ public class UserManagerService extends IUserManager.Stub {
     }
 
     @Override
-    public String getUserName() {
+    public @NonNull String getUserName() {
         final int callingUid = Binder.getCallingUid();
         if (!hasQueryOrCreateUsersPermission()
                 && !hasPermissionGranted(
@@ -1649,7 +1651,10 @@ public class UserManagerService extends IUserManager.Stub {
         final int userId = UserHandle.getUserId(callingUid);
         synchronized (mUsersLock) {
             UserInfo userInfo = userWithName(getUserInfoLU(userId));
-            return userInfo == null ? "" : userInfo.name;
+            if (userInfo != null && userInfo.name != null) {
+                return userInfo.name;
+            }
+            return "";
         }
     }
 
@@ -4165,7 +4170,7 @@ public class UserManagerService extends IUserManager.Stub {
      * @return the converted user, or {@code null} if no pre-created user could be converted.
      */
     private @Nullable UserInfo convertPreCreatedUserIfPossible(String userType,
-            @UserInfoFlag int flags, String name, @Nullable Object token) {
+            @UserInfoFlag int flags, @Nullable String name, @Nullable Object token) {
         final UserData preCreatedUserData;
         synchronized (mUsersLock) {
             preCreatedUserData = getPreCreatedUserLU(userType);