public void pushNumber(final CharSequence digits) {
            for (int i = 0; i < digits.length(); ++i)
                pushDigit(digits.charAt(i));
        }
Encapsulates the digit input logic and text to duration conversion logic.
android/third_party/time-duration-picker/src/main/java/mobi/upod/timedurationpicker/TimeDurationPicker.java