Mapping/Linking Hardware bottons to android device via USB port

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I'm an engineering student, and im working on a graduation project, and i just had an idea and need to ask this question.
Lets say we have 3 bottons, (X,Y,Z) 4 others UP,DOWN,LEFT,RIGHT, ANALOG(All directions)
If i press X, is it possible to associate it to specific area on the screen?
Is it possible to move a specific character in any game up/down/left and right using a hardware device?
Also moving the camera in all directions using the analog stick?
If i sent a signal from the device lets say X, will it communicate with the game it self or the device? Is it possible to make it communicate with the device a if i pressed X it press a specific are on the screen?
Sorry for the long post but i just had the thoughts and i want to know the possibilities of it.

Internal or external devices generate scan codes.
These are converted in /system/usr/keylayout/identifier.kl to keycodes.
Different devices (as long as they have different USB VID/PIDs) can have different maps.
Ultimately, you are dealing with keycodes.
The app would have to know that F1-6 deal with goblins on the left side of the screen
and that F7-12 deal with unicorns on the right side of the screen.

A short answer: The app would have to be aware.

So the hardware must speak to the app files im dealing with, would an emulator solve the problem?

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It's not a question of hardware vs. emulator.

You can have anything send any keycode that you want.

adb shell input keyevent 4

Will send a "Back" key.
Something has to interpret that.
Applications are written with a fixed understanding of keycodes.

Ok, if you want you can hack something to turn keycodes into touch events.
So "F1" would generate a touch down then up at the coordinates of 234, 132.
You'd need to do some low-level hacking or else hack the application.
If you were going to hack the application, it would be just easier to modify it so "F1" does what you want already.

I appreciate ur awesome reply sir you saved alot of time, ill get a developer to do that time to move fpr the next step, thanks again!

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