Added accessibility code to read back typed or deleted digits.

    @Override

    public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {

        if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED) {

            // AsYouTypeFormatter frequently replaces digits with formatted ones, which makes

            // tts too verbose. Let's ignore the whole event.

            // Since we're replacing the text every time we add or remove a

            // character, only read the difference. (issue 5337550)

            final int added = event.getAddedCount();

            final int removed = event.getRemovedCount();

            final int length = event.getBeforeText().length();

            if (added > removed) {

                event.setRemovedCount(0);

                event.setAddedCount(1);

                event.setFromIndex(length);

            } else if (removed > added) {

                event.setRemovedCount(1);

                event.setAddedCount(0);

                event.setFromIndex(length - 1);

            } else {

                return;

            }

        } else if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED) {

            // The parent EditText class lets tts read "edit box" when this View has a focus, which

            // confuses users on app launch (issue 5275935).