The third parameter marker is to hold the source of the XML document to be shredded in the form of byte array.

Once we know which array to use, we use that array as the data source of the spinner by creating an adapter (in this case, an ArrayAdapter) that we pass in to the spinner.

If the bit is 1, it USES the bit from source value 2. If you imagine each register as an array of bits, selb has the following meaning.