Exposed getLocationOnScreen, added formatToHexString method.

In order to use the ExportedProperty annotation, I needed a public non-void
method which is why I created a new "public int[] getLocationOnScreen()."

The formatToHexString method is used to convert an int or byte to a hex string
prefixed with "0x". I set the value to true on these flags: mGravity,
mPrivateFlags, mSystemUiVisibility, mViewFlags, mGroupFlags, mMarginFlags,
and flags.

Change-Id: I5914992ba19b80643dfcc6caa487398452e18cbc