OK yes I have revived an old thread of mine but I have found an Android app.
It's called Draw Express.
It's fairly simple to use, you just draw your shape, resize and position.
You then can draw in connectors, you can also mod the shapes and connectors.
Free and worth a look
https://play.google.com/store/apps/d...ess.lite&hl=en
Paid app
https://play.google.com/store/apps/d...ess.full&hl=en