I am using a property group like this in my csproj file, which defines where my keystore is and which passwords it has, for convenience:Warning:No -tsa or -tsacert is provided and this jar is not time stamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (2xxx-xx-xx) or after any future revocation date.
I could not find any options to add parameters to the jarsigner command, but I did notice, that the alias always came in the end of the jarsigner command in the output window. So my small workaround is to simply append the alias with -tsa http://timestamp.digicert.com, which removes the warning (yay!)
So now the property group looks like:
Although, I have recently put up APK files on the Play Store without this hack to remove the warnings and they were accepted just fine. So I guess... do whatever you want ;)