Owner should not be announces as a user switch.

1. The accessibility layer announces user switches. Even though
   the initial switch to the owner on a singe user device is a
   valid use switch we should not announce it for accessibility.

bug:7264693

Change-Id: Idf022fab6b74c84b7a96bc4ed7c7fee2b83029a6

Author: sganov

core/res/res/values/strings.xml

@@ -3934,6 +3934,6 @@
     <!-- Text spoken when the user stops preforming a gesture that would enable accessibility. [CHAR LIMIT=none] -->
     <string name="enable_accessibility_canceled">Enable accessibility canceled.</string>
     <!-- Text spoken when the current user is switched if accessibility is enabled. [CHAR LIMIT=none] -->
-    <string name="user_switched">Switched to user <xliff:g id="name" example="Bob">%1$s</xliff:g>.</string>
+    <string name="user_switched">Current user <xliff:g id="name" example="Bob">%1$s</xliff:g>.</string>
 
 </resources>

services/java/com/android/server/accessibility/AccessibilityManagerService.java

@@ -111,7 +111,7 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub {
 
     // TODO: This is arbitrary. When there is time implement this by watching
     //       when that accessibility services are bound.
-    private static final int WAIT_FOR_USER_STATE_FULLY_INITIALIZED_MILLIS = 5000;
+    private static final int WAIT_FOR_USER_STATE_FULLY_INITIALIZED_MILLIS = 3000;
 
     private static final String FUNCTION_REGISTER_UI_TEST_AUTOMATION_SERVICE =
         "registerUiTestAutomationService";
@@ -659,16 +659,22 @@ private void switchUser(int userId) {
                         oldUserState.mUserId, 0).sendToTarget();
             }
 
+            // Announce user changes only if more that one exist.
+            UserManager userManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
+            final boolean announceNewUser = userManager.getUsers().size() > 1;
+
             // The user changed.
             mCurrentUserId = userId;
 
             // Recreate the internal state for the new user.
             mMainHandler.obtainMessage(MainHandler.MSG_SEND_RECREATE_INTERNAL_STATE,
                     mCurrentUserId, 0).sendToTarget();
 
-            // Schedule announcement of the current user if needed.
-            mMainHandler.sendEmptyMessageDelayed(MainHandler.MSG_ANNOUNCE_NEW_USER_IF_NEEDED,
-                    WAIT_FOR_USER_STATE_FULLY_INITIALIZED_MILLIS);
+            if (announceNewUser) {
+                // Schedule announcement of the current user if needed.
+                mMainHandler.sendEmptyMessageDelayed(MainHandler.MSG_ANNOUNCE_NEW_USER_IF_NEEDED,
+                        WAIT_FOR_USER_STATE_FULLY_INITIALIZED_MILLIS);
+            }
         }
     }