If you have created a Google My Maps map through the browser tools, you can just copy the link to your My Map and then pass it to the Google Map Application on the device.

Intent intent = new Intent("android.intent.action.VIEW");
intent.setComponent(ComponentName.unflattenFromString("com.google.android.apps.maps/com.google.android.maps.MapsActivity"));
intent.addCategory(android.intent.category.LAUNCHER);
// replace string with your Google My Map URL
intent.setData("Your Google My Map URL HERE");
startActivity(intent);

I don't believe that the MapView API supports My Maps, so one path is to use the Google Map application if you want to view your data.

Or you could export it out of My Maps as KML and parse it yourself for your app, but then you are responsible for putting down all of the POI markers, etc.

Update 2011-04-13:

If you add on the parameter 'output=kml' to your Google My Maps link URL you can get the KML file of your map. KML is just an XML file containing all of the points of interest on that map along with lat/long and details. Once you parse the file, do what you want with the data.

Update 2015-05-20:

Looks like the new version of Google My Maps has KML import and export capabilities. You can export as a KML file or a network link to the KML file.

See: Google My Maps - Export a map

You have can have a look at OSMNavigator.

• View multiple maps overlaid (Google only shows one at a time) => Not sure what you mean.

• View ALL features on each map (Google caps off at around 200 and arbitrarily decides which ones to show) => Yes. It reasonably handles KML files of 2 Mb.

• View and edit these features (Google does not match the names with the features, and does not allow existing features to be edited). => Partially. This is not a full-features editor, but you can:

  • open a KML file from a URL (over the network, whatever it is)
  • open a local KML or KMZ file
  • add a Point/a route,
  • navigate in the hierarchy,
  • Cut/Copy/Paste,
  • hide/show,
  • edit some attributes: title, description, colors.
  • and you can save the final result on the device.