Android Software or Device to present Application on Screen
You might be able to connect an Android phone via the 3.5 mm headphone jack (using TV out), with a RCA cable if the project supports it, or some variation, of course.
Also, I think there are now tablets which have a HDMI output port (or some variation) which you can connect to a datashow (eventually with a VGA adapter).

When connected, what is projected is exactly what you see on your device.