add

Assets/3rd/NativeGallery/Android/NGCallbackHelper.cs

@@ -0,0 +1,31 @@
+#if !UNITY_EDITOR && UNITY_ANDROID
+using UnityEngine;
+
+namespace NativeGalleryNamespace
+{
+	public class NGCallbackHelper : MonoBehaviour
+	{
+		private System.Action mainThreadAction = null;
+
+		private void Awake()
+		{
+			DontDestroyOnLoad( gameObject );
+		}
+
+		private void Update()
+		{
+			if( mainThreadAction != null )
+			{
+				System.Action temp = mainThreadAction;
+				mainThreadAction = null;
+				temp();
+			}
+		}
+
+		public void CallOnMainThread( System.Action function )
+		{
+			mainThreadAction = function;
+		}
+	}
+}
+#endif