ContactPictureLoader.java 文件源码

@VisibleForTesting
protected static String calcUnknownContactLetter(Address address) {
    String letter = null;
    String personal = address.getPersonal();
    String str = (personal != null) ? personal : address.getAddress();
    Matcher m = EXTRACT_LETTER_PATTERN.matcher(str);
    if (m.find()) {
        letter = m.group(0).toUpperCase(Locale.US);
    }

    return (TextUtils.isEmpty(letter)) ?
            FALLBACK_CONTACT_LETTER : letter;
}