Do not allow to disable package "android"

                if (pkgSetting == null) {

                    return false;

                }

                // Do not allow "android" is being disabled

                if ("android".equals(packageName)) {

                    Slog.w(TAG, "Cannot hide package: android");

                    return false;

                }

                // Only allow protected packages to hide themselves.

                if (hidden && !UserHandle.isSameApp(uid, pkgSetting.appId)

                        && mProtectedPackages.isPackageStateProtected(userId, packageName)) {

                    Slog.w(TAG, "Not hiding protected package: " + packageName);

                    return false;

                }

                if (pkgSetting.getHidden(userId) != hidden) {

                    pkgSetting.setHidden(hidden, userId);

                    mSettings.writePackageRestrictionsLPr(userId);