public static String replaceAllEmojis(String str, final String replacementString) {
    EmojiParser.EmojiTransformer emojiTransformer = new EmojiParser.EmojiTransformer() {
      public String transform(EmojiParser.UnicodeCandidate unicodeCandidate) {
        return replacementString;
      }
    };

    return parseFromUnicode(str, emojiTransformer);
  }
Replace all emojis with character

@param str the string to process
@param replacementString replacement the string that will replace all the emojis
@return the string with replaced character
src/main/java/com/vdurmont/emoji/EmojiParser.java