Release 4.0.0-preview1-00301

[platform/core/csapi/tizenfx.git] / src / Tizen.System.SystemSettings / Tizen.System.SystemSettings / SystemSettings.cs

diff --git a/src/Tizen.System.SystemSettings/Tizen.System.SystemSettings/SystemSettings.cs b/src/Tizen.System.SystemSettings/Tizen.System.SystemSettings/SystemSettings.cs
index 2af7223..965ac07 100755 (executable)
--- a/src/Tizen.System.SystemSettings/Tizen.System.SystemSettings/SystemSettings.cs
+++ b/src/Tizen.System.SystemSettings/Tizen.System.SystemSettings/SystemSettings.cs
@@ -32,6 +32,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.incoming_call</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string IncomingCallRingtone
         {
             get
@@ -59,6 +65,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.home_screen</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string WallpaperHomeScreen
         {
             get
@@ -86,6 +98,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.lock_screen</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string WallpaperLockScreen
         {
             get
@@ -113,6 +131,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static SystemSettingsFontSize FontSize
         {
             get
@@ -140,6 +163,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string FontType
         {
             get
@@ -167,6 +195,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool MotionActivationEnabled
         {
             get
@@ -194,6 +227,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.notification_email</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string EmailAlertRingtone
         {
             get
@@ -220,6 +259,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool UsbDebuggingEnabled
         {
             get
@@ -247,6 +291,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool Data3GNetworkEnabled
         {
             get
@@ -274,24 +323,30 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
-        public static string LockscreenApp
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.lock_screen</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
+        public static string LockScreenApp
         {
             get
             {
                 string pkgName;
-                SystemSettingsError res = (SystemSettingsError)Interop.Settings.SystemSettingsGetValueString(SystemSettingsKeys.LockscreenApp, out pkgName);
+                SystemSettingsError res = (SystemSettingsError)Interop.Settings.SystemSettingsGetValueString(SystemSettingsKeys.LockScreenApp, out pkgName);
                 if (res != SystemSettingsError.None)
                 {
-                    throw SystemSettingsExceptionFactory.CreateException(res, "unable to get LockscreenApp system setting.");
+                    throw SystemSettingsExceptionFactory.CreateException(res, "unable to get LockScreenApp system setting.");
                 }
                 return pkgName;
             }
             set
             {
-                SystemSettingsError res = (SystemSettingsError)Interop.Settings.SystemSettingsSetValueString(SystemSettingsKeys.LockscreenApp, value);
+                SystemSettingsError res = (SystemSettingsError)Interop.Settings.SystemSettingsSetValueString(SystemSettingsKeys.LockScreenApp, value);
                 if (res != SystemSettingsError.None)
                 {
-                    throw SystemSettingsExceptionFactory.CreateException(res, "unable to set LockscreenApp system setting.");
+                    throw SystemSettingsExceptionFactory.CreateException(res, "unable to set LockScreenApp system setting.");
                 }
             }
         }
@@ -301,6 +356,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string DefaultFontType
         {
             get
@@ -322,6 +382,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string LocaleCountry
         {
             get
@@ -351,6 +416,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string LocaleLanguage
         {
             get
@@ -379,6 +449,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool LocaleTimeFormat24HourEnabled
         {
             get
@@ -406,6 +481,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string LocaleTimeZone
         {
             get
@@ -433,6 +513,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static int Time
         {
             get
@@ -451,6 +536,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool SoundLockEnabled
         {
             get
@@ -470,6 +560,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool SoundSilentModeEnabled
         {
             get
@@ -489,6 +584,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool SoundTouchEnabled
         {
             get
@@ -508,6 +608,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool DisplayScreenRotationAutoEnabled
         {
             get
@@ -527,6 +632,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string DeviceName
         {
             get
@@ -545,6 +655,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool MotionEnabled
         {
             get
@@ -564,6 +679,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/network.wifi</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool NetworkWifiNotificationEnabled
         {
             get
@@ -583,6 +704,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static bool NetworkFlightModeEnabled
         {
             get
@@ -602,6 +728,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static int ScreenBacklightTime
         {
             get
@@ -629,6 +760,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.incoming_call</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string SoundNotification
         {
             get
@@ -656,6 +793,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static int SoundNotificationRepetitionPeriod
         {
             get
@@ -683,6 +825,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static SystemSettingsIdleLockState LockState
         {
             get
@@ -710,6 +857,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static string AdsId
         {
             get
@@ -738,6 +890,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/network.telephony</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static SystemSettingsUdsState UltraDataSave
         {
             get
@@ -752,6 +910,29 @@ namespace Tizen.System
             }
         }
 
+        /// <summary>
+        /// Indicates whether the accessibility TTS is enabled on the device.
+        /// </summary>
+        /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
+        /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
+        public static bool AccessibilityTtsEnabled
+        {
+            get
+            {
+                bool isAccessibilityTTSEnabled;
+                SystemSettingsError res = (SystemSettingsError)Interop.Settings.SystemSettingsGetValueBool(SystemSettingsKeys.AccessibilityTtsEnabled, out isAccessibilityTTSEnabled);
+                if (res != SystemSettingsError.None)
+                {
+                    throw SystemSettingsExceptionFactory.CreateException(res, "unable to get AccessibilityTTS system setting value.");
+                }
+                return isAccessibilityTTSEnabled;
+            }
+        }
 
 
         private static readonly Interop.Settings.SystemSettingsChangedCallback s_incomingCallRingtoneChangedCallback = (SystemSettingsKeys key, IntPtr userData) =>
@@ -766,6 +947,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.incoming_call</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<IncomingCallRingtoneChangedEventArgs> IncomingCallRingtoneChanged
         {
             add
@@ -807,6 +994,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.home_screen</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<WallpaperHomeScreenChangedEventArgs> WallpaperHomeScreenChanged
         {
             add
@@ -848,6 +1041,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.lock_screen</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<WallpaperLockScreenChangedEventArgs> WallpaperLockScreenChanged
         {
             add
@@ -889,6 +1088,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<FontSizeChangedEventArgs> FontSizeChanged
         {
             add
@@ -930,6 +1134,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<FontTypeChangedEventArgs> FontTypeChanged
         {
             add
@@ -971,6 +1180,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<MotionActivationSettingChangedEventArgs> MotionActivationSettingChanged
         {
             add
@@ -1012,6 +1226,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.notification_email</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<EmailAlertRingtoneChangedEventArgs> EmailAlertRingtoneChanged
         {
             add
@@ -1053,6 +1273,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<UsbDebuggingSettingChangedEventArgs> UsbDebuggingSettingChanged
         {
             add
@@ -1094,6 +1319,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<Data3GNetworkSettingChangedEventArgs> Data3GNetworkSettingChanged
         {
             add
@@ -1125,23 +1355,29 @@ namespace Tizen.System
 
         private static readonly Interop.Settings.SystemSettingsChangedCallback s_lockscreenAppChangedCallback = (SystemSettingsKeys key, IntPtr userData) =>
         {
-            string lockScreenApp = SystemSettings.LockscreenApp;
-            LockscreenAppChangedEventArgs eventArgs = new LockscreenAppChangedEventArgs(lockScreenApp);
+            string lockScreenApp = SystemSettings.LockScreenApp;
+            LockScreenAppChangedEventArgs eventArgs = new LockScreenAppChangedEventArgs(lockScreenApp);
             s_lockscreenAppChanged?.Invoke(null, eventArgs);
         };
-        private static event EventHandler<LockscreenAppChangedEventArgs> s_lockscreenAppChanged;
+        private static event EventHandler<LockScreenAppChangedEventArgs> s_lockscreenAppChanged;
         /// <summary>
-        /// The LockscreenAppChanged event is triggered when the lockscreen application package name is changed.
+        /// The LockScreenAppChanged event is triggered when the lockscreen application package name is changed.
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
-        public static event EventHandler<LockscreenAppChangedEventArgs> LockscreenAppChanged
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.lock_screen</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
+        public static event EventHandler<LockScreenAppChangedEventArgs> LockScreenAppChanged
         {
             add
             {
                 if (s_lockscreenAppChanged == null)
                 {
-                    SystemSettingsError ret = (SystemSettingsError)Interop.Settings.SystemSettingsSetCallback(SystemSettingsKeys.LockscreenApp, s_lockscreenAppChangedCallback, IntPtr.Zero);
+                    SystemSettingsError ret = (SystemSettingsError)Interop.Settings.SystemSettingsSetCallback(SystemSettingsKeys.LockScreenApp, s_lockscreenAppChangedCallback, IntPtr.Zero);
                     if (ret != SystemSettingsError.None)
                     {
                         throw SystemSettingsExceptionFactory.CreateException(ret, "Error in callback handling");
@@ -1155,7 +1391,7 @@ namespace Tizen.System
                 s_lockscreenAppChanged -= value;
                 if (s_lockscreenAppChanged == null)
                 {
-                    SystemSettingsError ret = (SystemSettingsError)Interop.Settings.SystemSettingsRemoveCallback(SystemSettingsKeys.LockscreenApp);
+                    SystemSettingsError ret = (SystemSettingsError)Interop.Settings.SystemSettingsRemoveCallback(SystemSettingsKeys.LockScreenApp);
                     if (ret != SystemSettingsError.None)
                     {
                         throw SystemSettingsExceptionFactory.CreateException(ret, "Error in callback handling");
@@ -1176,6 +1412,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<LocaleCountryChangedEventArgs> LocaleCountryChanged
         {
             add
@@ -1217,6 +1458,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<LocaleLanguageChangedEventArgs> LocaleLanguageChanged
         {
             add
@@ -1258,6 +1504,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<LocaleTimeFormat24HourSettingChangedEventArgs> LocaleTimeFormat24HourSettingChanged
         {
             add
@@ -1299,6 +1550,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<LocaleTimeZoneChangedEventArgs> LocaleTimeZoneChanged
         {
             add
@@ -1330,7 +1586,7 @@ namespace Tizen.System
 
         private static readonly Interop.Settings.SystemSettingsChangedCallback s_timeChangedCallback = (SystemSettingsKeys key, IntPtr userData) =>
         {
-            
+
             int time = SystemSettings.Time;
             TimeChangedEventArgs eventArgs = new TimeChangedEventArgs(time);
             s_timeChanged?.Invoke(null, eventArgs);
@@ -1341,6 +1597,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<TimeChangedEventArgs> TimeChanged
         {
             add
@@ -1382,6 +1643,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<SoundLockSettingChangedEventArgs> SoundLockSettingChanged
         {
             add
@@ -1423,6 +1689,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<SoundSilentModeSettingChangedEventArgs> SoundSilentModeSettingChanged
         {
             add
@@ -1464,6 +1735,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<SoundTouchSettingChangedEventArgs> SoundTouchSettingChanged
         {
             add
@@ -1483,6 +1759,7 @@ namespace Tizen.System
             {
                 s_soundTouchChanged -= value;
                 if (s_soundTouchChanged == null)
+
                 {
                     SystemSettingsError ret = (SystemSettingsError)Interop.Settings.SystemSettingsRemoveCallback(SystemSettingsKeys.SoundTouchEnabled);
                     if (ret != SystemSettingsError.None)
@@ -1505,6 +1782,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<DisplayScreenRotationAutoSettingChangedEventArgs> DisplayScreenRotationAutoSettingChanged
         {
             add
@@ -1546,6 +1828,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<DeviceNameChangedEventArgs> DeviceNameChanged
         {
             add
@@ -1587,6 +1874,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<MotionSettingChangedEventArgs> MotionSettingChanged
         {
             add
@@ -1628,6 +1920,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/network.wifi</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<NetworkWifiNotificationSettingChangedEventArgs> NetworkWifiNotificationSettingChanged
         {
             add
@@ -1669,6 +1967,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<NetworkFlightModeSettingChangedEventArgs> NetworkFlightModeSettingChanged
         {
             add
@@ -1710,6 +2013,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<ScreenBacklightTimeChangedEventArgs> ScreenBacklightTimeChanged
         {
             add
@@ -1751,6 +2059,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/systemsetting.incoming_call</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<SoundNotificationChangedEventArgs> SoundNotificationChanged
         {
             add
@@ -1792,6 +2106,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<SoundNotificationRepetitionPeriodChangedEventArgs> SoundNotificationRepetitionPeriodChanged
         {
             add
@@ -1833,6 +2152,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<LockStateChangedEventArgs> LockStateChanged
         {
             add
@@ -1874,6 +2198,11 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<AdsIdChangedEventArgs> AdsIdChanged
         {
             add
@@ -1915,6 +2244,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/network.telephony</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<UltraDataSaveChangedEventArgs> UltraDataSaveChanged
         {
             add
@@ -1956,6 +2291,12 @@ namespace Tizen.System
         /// </summary>
         /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
         /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <feature>http://tizen.org/feature/network.telephony</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
         public static event EventHandler<UltraDataSavePackageListChangedEventArgs> UltraDataSavePackageListChanged
         {
             add
@@ -1984,6 +2325,54 @@ namespace Tizen.System
                 }
             }
         }
+
+        private static readonly Interop.Settings.SystemSettingsChangedCallback s_accessibilityTtsChangedCallback = (SystemSettingsKeys key, IntPtr userData) =>
+        {
+            bool accessibilityTts = SystemSettings.AccessibilityTtsEnabled;
+            AccessibilityTtsSettingChangedEventArgs eventArgs = new AccessibilityTtsSettingChangedEventArgs(accessibilityTts);
+            s_accessibilityTtsChanged?.Invoke(null, eventArgs);
+        };
+        private static event EventHandler<AccessibilityTtsSettingChangedEventArgs> s_accessibilityTtsChanged;
+        /// <summary>
+        /// THe AccessibilityTtsChanged event is triggered when the screen touch sound enabled status is changed.
+        /// </summary>
+        /// <privilege>http://tizen.org/privilege/systemsettings.admin</privilege>
+        /// <privlevel>platform</privlevel>
+        /// <feature>http://tizen.org/feature/systemsetting</feature>
+        /// <exception cref="ArgumentException">Invalid Argument</exception>
+        /// <exception cref="NotSupportedException">Not Supported feature</exception>
+        /// <exception cref="InvalidOperationException">Invalid operation</exception>
+        /// <exception cref="UnauthorizedAccessException">Thrown when application does not have privilege to access this method.</exception>
+        public static event EventHandler<AccessibilityTtsSettingChangedEventArgs> AccessibilityTtsSettingChanged
+        {
+            add
+            {
+                if (s_accessibilityTtsChanged == null)
+                {
+                    SystemSettingsError ret = (SystemSettingsError)Interop.Settings.SystemSettingsSetCallback(SystemSettingsKeys.AccessibilityTtsEnabled, s_accessibilityTtsChangedCallback, IntPtr.Zero);
+                    if (ret != SystemSettingsError.None)
+                    {
+                        throw SystemSettingsExceptionFactory.CreateException(ret, "Error in callback handling");
+                    }
+                }
+                s_accessibilityTtsChanged += value;
+            }
+
+            remove
+            {
+                s_accessibilityTtsChanged -= value;
+                if (s_accessibilityTtsChanged == null)
+
+                {
+                    SystemSettingsError ret = (SystemSettingsError)Interop.Settings.SystemSettingsRemoveCallback(SystemSettingsKeys.AccessibilityTtsEnabled);
+                    if (ret != SystemSettingsError.None)
+                    {
+                        throw SystemSettingsExceptionFactory.CreateException(ret, "Error in callback handling");
+                    }
+                }
+            }
+        }
+
     }
 }