Update getHomeActivitiesAsUser()

            }

            allHomeCandidates.addAll(resolveInfos);

            final String packageName = mDefaultAppProvider.getDefaultHome(userId);

            String packageName = mDefaultAppProvider.getDefaultHome(userId);

            if (packageName == null) {

                // Role changes are not and cannot be atomic because its implementation lives inside

                // a system app, so when the home role changes, there is a window when the previous

                // role holder is removed and the new role holder is granted the preferred activity,

                // but hasn't become the role holder yet. However, this case may be easily hit

                // because the preferred activity change triggers a broadcast and receivers may try

                // to get the default home activity there. So we need to fix it for this time

                // window, and an easy workaround is to fallback to the current preferred activity.

                final int appId = UserHandle.getAppId(Binder.getCallingUid());

                final boolean filtered = appId >= Process.FIRST_APPLICATION_UID;

                FindPreferredActivityBodyResult result = findPreferredActivityInternal(

                        intent, null, 0, resolveInfos, true, false, false, userId, filtered);

                ResolveInfo preferredResolveInfo =  result.mPreferredResolveInfo;

                if (preferredResolveInfo != null && preferredResolveInfo.activityInfo != null) {

                    packageName = preferredResolveInfo.activityInfo.packageName;

                }

            }

            if (packageName == null) {

                return null;

            }