Show marker in Google Maps even if no web connection is available

I have searched hours, but I couldn’t find anything useful.

I have an App, where if the user have no Internet-connection, the current location is shown on Google Maps using:

geo:lat,long?z=18

This code shows the area of the location, but no marker. If I have Internet connection the following snippet works fine:

geo:lat,long?z=18(NameOfMarker)

But how can I set a marker without Internet connection?

Thanks for help.

Thanks at first.
Currently I am using:

String geoUriString = "geo:"+ my.getLocation().getLatitude() + ","
              + my.getLocation().getLongitude()+"?z=18";
Uri geoUri = Uri.parse(geoUriString);

Intent mapCall = new Intent(Intent.ACTION_VIEW, geoUri);
mapCall.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(mapCall);

How can I combine the code you gave with this?

Sorry, but I never worked with JavaScript in Android.

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