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Is it possible to make a touchscreen arduino device which displays one single android app? Answered

The device should be able to connect online, so that it can update new releases of the app.  


No. You could get it onto a Raspberry Pi though

But to access net, wont i need to hook it up with an arduino? Arduinos different shields will allow me to do that, would it not? or can i hook up something similar to Raspberry Pi itself?

The Pi comes with ethernet as standard, and usb for a connection to a powered hub, where you plug in a wireless dongle.

no. A micro controller doesn't have the hardware needed to run the OS. Namely it doesn't have an actual processor or RAM.