android get picasa image URLs

We are working on an application that needs / wants to act like the stock Gall开发者_StackOverflow中文版ery app in that it shows images from the SD card, as well as images from picasa.

I realize I could obtain credentials from the user / use oauth / whatever, then access the picasa web service API, and so on. however, I'm wondering if there's any shortcut. requiring the user to log in to picasa each time they fire up the app is a real downer. even asking for the creds one time makes people worry.

any ideas?

You can request permission to use the Google account using the AccountManager API. See What should I use Android AccountManager for? for more details on this.