no donate notice in changelog when using the app for one of the first times

src/keepass2android/ChangeLog.cs

@@ -9,6 +9,7 @@ using Android.Content.PM;
 using Android.Content.Res;
 using Android.Graphics;
 using Android.OS;
+using Android.Preferences;
 using Android.Runtime;
 using Android.Text;
 using Android.Text.Method;
@@ -146,21 +147,36 @@ namespace keepass2android
 			{
 				string versionLog2 = versionLog; 
 				bool title = true;
-				if (isFirst)
+			    if (isFirst)
-				{
+			    {
-					if (versionLog2.EndsWith("\n") == false)
+
-						versionLog2 += "\n";
+			        bool showDonateOption = true;
-					string donateUrl = ctx.GetString(Resource.String.donate_url,
+			        ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(ctx);
-														 new Java.Lang.Object[]{ctx.Resources.Configuration.Locale.Language,
+			        if (prefs.GetBoolean(ctx.GetString(Resource.String.NoDonationReminder_key), false))
-						ctx.PackageName
+			            showDonateOption = false;
-					});
+
-					versionLog2 += " * <a href=\"" + donateUrl
+			        long usageCount = prefs.GetLong(ctx.GetString(Resource.String.UsageCount_key), 0);
-						+ "\">" +
+
-						ctx.GetString(Resource.String.ChangeLog_keptDonate)
+			        if (usageCount <= 5)
-							+ "<a/>";
+			            showDonateOption = false;
-					isFirst = false;
+
-				}
+			        if (showDonateOption)
-				foreach (string line in versionLog2.Split('\n'))
+			        {
+			            if (versionLog2.EndsWith("\n") == false)
+			                versionLog2 += "\n";
+			            string donateUrl = ctx.GetString(Resource.String.donate_url,
+			                new Java.Lang.Object[]{ctx.Resources.Configuration.Locale.Language,
+			                    ctx.PackageName
+			                });
+
+			            versionLog2 += " * <a href=\"" + donateUrl
+			                           + "\">" +
+			                           ctx.GetString(Resource.String.ChangeLog_keptDonate)
+			                           + "<a/>";
+			        }
+			        isFirst = false;
+			    }
+                foreach (string line in versionLog2.Split('\n'))
 				{
 					string w = line.Trim();
 					if (title)