[Tizen] Fixed Tizen 4.0 regression issue (#12132)

Author: rookiejava

Xamarin.Forms.Platform.Tizen/FormsApplication.cs

@@ -11,6 +11,7 @@
 using ElmSharp.Wearable;
 using Specific = Xamarin.Forms.PlatformConfiguration.TizenSpecific.Application;
 using Xamarin.Forms.Platform.Tizen.Native;
+using Tizen.Common;
 
 namespace Xamarin.Forms.Platform.Tizen
 {
@@ -60,6 +61,12 @@ protected override void OnPreCreate()
 			base.OnPreCreate();
 			Application.ClearCurrent();
 
+			if (DotnetUtil.TizenAPIVersion < 5)
+			{
+				// We should set the env variable to support IsolatedStorageFile on tizen 4.0 or lower version.
+				Environment.SetEnvironmentVariable("XDG_DATA_HOME", Current.DirectoryInfo.Data);
+			}
+
 			var type = typeof(Window);
 			// Use reflection to avoid breaking compatibility. ElmSharp.Window.CreateWindow() is has been added since API6.
 			var methodInfo = type.GetMethod("CreateWindow", BindingFlags.NonPublic | BindingFlags.Static);