Android限制EditText输入Emoji表情

public class EmojiFilter implements InputFilter {    @Override    public CharSequence filter(CharSequence source, int i, int i1, Spanned spanned, int i2, int i3) {        Pattern pattern = Pattern.compile(                "[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]",                Pattern.UNICODE_CASE | Pattern.CASE_INSENSITIVE);        Matcher matcher = pattern.matcher(source);        if (matcher.find()) {            return "";        }        return null;    }}

editText.filters = arrayOf<InputFilter>(EmojiFilter())