Android database options?

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I have a project that I'm trying to do which is a database, and really I need it to be available as an app on phones, but with the ability to upload/download records from a shared database online.

I.e. local shell where data records can be entered, and either just stored/retrieved locally, or uploaded to the online database for others with the same app to access and vice versa.

I've looked at Memento and HandBase and in terms of the local database side of things they look good because they can be customised easily (for a database no-nothing like me), but I have no idea about whether they can do the online bit or how I would do that.

Are there any services which would offer online storage/sharing (ideally free to at least test!) of the data from apps like these? And if these particular app examples won't do the online bit is there one that anyone knows of that would do what I want?

I'm no good at databases but find apps at this level easy enough to use. So it'd need to be reasonably idiotproof. Probably am asking too much here, but thought it's worth asking in case there is something that suits my needs without needing to be a database boffin.

As the icing on the cake, it would be great if it could also be used on desktops as well. Does such a thing exist that does all this and can be set up by a simpleton?

Thanks for any useful suggestions in advance.

Actually, the more I read about Memento, the more it looks like it can pretty much do all of this, fairly easily via google docs and/or their own servers.

From the look of it also, if I wanted a database that required payment for access I'd just take a paypal payment for instance, and then grant the user access via adding their email address to the list of permitted users? Think that's how it works but if anyone uses Memento and can confirm this sort of thing that'd be cool.