Merge "Expose findCurrentGuestUser() to system apps"

core/java/android/os/IUserManager.aidl

@@ -87,6 +87,7 @@ interface IUserManager {
     void setDefaultGuestRestrictions(in Bundle restrictions);
     Bundle getDefaultGuestRestrictions();
     boolean markGuestForDeletion(int userId);
+    UserInfo findCurrentGuestUser();
     boolean isQuietModeEnabled(int userId);
     void setSeedAccountData(int userId, in String accountName,
             in String accountType, in PersistableBundle accountOptions, boolean persist);

core/java/android/os/UserManager.java

@@ -2374,6 +2374,20 @@ public class UserManager {
         return guest;
     }
 
+    /**
+     * Gets the existing guest user if it exists.  This does not include guest users that are dying.
+     * @return The existing guest user if it exists. Null otherwise.
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.MANAGE_USERS)
+    public UserInfo findCurrentGuestUser() {
+        try {
+            return mService.findCurrentGuestUser();
+        } catch (RemoteException re) {
+            throw re.rethrowFromSystemServer();
+        }
+    }
+
     /**
      * Creates a user with the specified name and options as a profile of another user.
      * Requires {@link android.Manifest.permission#MANAGE_USERS} permission.

packages/CarSystemUI/src/com/android/systemui/statusbar/car/UserGridRecyclerView.java

@@ -21,6 +21,7 @@ import static android.content.DialogInterface.BUTTON_POSITIVE;
 import static android.os.UserManager.DISALLOW_ADD_USER;
 import static android.os.UserManager.SWITCHABILITY_STATUS_OK;
 
+import android.annotation.Nullable;
 import android.app.ActivityManager;
 import android.app.AlertDialog;
 import android.app.AlertDialog.Builder;
@@ -266,7 +267,10 @@ public class UserGridRecyclerView extends RecyclerView {
 
                 if (userRecord.mIsStartGuestSession) {
                     notifyUserSelected(userRecord);
-                    mCarUserManagerHelper.startGuestSession(mGuestName);
+                    UserInfo guest = createNewOrFindExistingGuest(mContext);
+                    if (guest != null) {
+                        mCarUserManagerHelper.switchToUser(guest);
+                    }
                     return;
                 }
 
@@ -381,6 +385,24 @@ public class UserGridRecyclerView extends RecyclerView {
             return circleIcon;
         }
 
+        /**
+         * Finds the existing Guest user, or creates one if it doesn't exist.
+         * @param context App context
+         * @return UserInfo representing the Guest user
+         */
+        @Nullable
+        public UserInfo createNewOrFindExistingGuest(Context context) {
+            // CreateGuest will return null if a guest already exists.
+            UserInfo newGuest = mUserManager.createGuest(context, mGuestName);
+            if (newGuest != null) {
+                new UserIconProvider().assignDefaultIcon(
+                        mUserManager, context.getResources(), newGuest);
+                return newGuest;
+            }
+
+            return mUserManager.findCurrentGuestUser();
+        }
+
         @Override
         public void onClick(DialogInterface dialog, int which) {
             if (which == BUTTON_POSITIVE) {

packages/CarSystemUI/src/com/android/systemui/statusbar/car/UserIconProvider.java

@@ -88,7 +88,7 @@ public class UserIconProvider {
      * @param userInfo User whose avatar is set to default icon.
      * @return Bitmap of the user icon.
      */
-    private Bitmap assignDefaultIcon(
+    public Bitmap assignDefaultIcon(
             UserManager userManager, Resources resources, UserInfo userInfo) {
         Bitmap bitmap = userInfo.isGuest()
                 ? getGuestUserDefaultIcon(resources)

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

@@ -3452,8 +3452,13 @@ public class UserManagerService extends IUserManager.Stub {
     /**
      * Find the current guest user. If the Guest user is partial,
      * then do not include it in the results as it is about to die.
+     *
+     * @return The current guest user.  Null if it doesn't exist.
+     * @hide
      */
-    private UserInfo findCurrentGuestUser() {
+    @Override
+    public UserInfo findCurrentGuestUser() {
+        checkManageUsersPermission("findCurrentGuestUser");
         synchronized (mUsersLock) {
             final int size = mUsers.size();
             for (int i = 0; i < size; i++) {

services/tests/servicestests/src/com/android/server/pm/UserManagerTest.java

@@ -262,6 +262,19 @@ public class UserManagerTest extends AndroidTestCase {
         assertNull(userInfo2);
     }
 
+    @MediumTest
+    public void testFindExistingGuest_guestExists() throws Exception {
+        UserInfo userInfo1 = createUser("Guest", UserInfo.FLAG_GUEST);
+        UserInfo foundGuest = mUserManager.findCurrentGuestUser();
+        assertNotNull(foundGuest);
+    }
+
+    @SmallTest
+    public void testFindExistingGuest_guestDoesNotExist() throws Exception {
+        UserInfo foundGuest = mUserManager.findCurrentGuestUser();
+        assertNull(foundGuest);
+    }
+
     @MediumTest
     public void testSetUserAdmin() throws Exception {
         UserInfo userInfo = createUser("SecondaryUser", /*flags=*/ 0);