title: Mask an EditText with Phone Number Format NaN like in PhoneNumberUtils
body: <p>I want to make user inputted phone number in an editText to dynamically change format every time the user inputs a number. That is, when user inputs up to 4 digits, like 7144, the editText shows "714-4".
  I would like the editText to be dynamically updated to format ###-###-#### whenever the user inputs a digit. how can this be done? also, I am handling more than one editTexts.</p>