manipulate android phone button callback - java

I am a beginner in programming and I don't know much about it. I was asked to figure out how to "Manipulate an Android smartphone to do the following":
1) Create a button that would generate a callback (for example turn the screen from black to white)
2) Control the hardware of the device (Switch on the camera flash light, switch off the light)
I Would appreciate any help as I don't know what steps I should take to achieve this as I am an absolute beginner.

1)Change background after click
2)How to use camera
But first follow Android training to understand how Activities works

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