What I have tried:
specifying the inputType for the EditText on the main.xml page as...
textFilter
text|textNoSuggestions
textNoSuggestions
In the java file in the onCreate
EditText hex = (EditText) findViewById(R.id.editHex);
hex.setInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
I'm running this on an emulator using API 13.