Use Emojicons with SoftKeyboard

[Oren Afek]

How can I determine if an integer represents a legal Emojicon?
I'm trying to dynamically add an Emoji key, and then detect it when its pressed.

This is my key addition snippet

private void registerEmoji (Keyboard keyboard, @DrawableRes int emojiRes) {
        List<Keyboard.Key> keys = keyboard.getKeys();
        Keyboard.Row row = new Keyboard.Row(keyboard);

        Drawable emoji = getResources().getDrawable(emojiRes);

        Emojicon emojicon = Emojicon.fromResource(emojiRes, 0);

        Keyboard.Key key = new Keyboard.Key(row);
        key.codes = new int[]{emojiRes};
        key.gap = 10;
        key.height = emoji.getMinimumWidth();
        key.width = emoji.getMinimumWidth();
        key.icon = emoji;
        keys.add(key);
    }

And here I'm trying to detect it

public void onKey(int primaryCode, int[] keyCodes) {
                InputConnection ic = getCurrentInputConnection();
                playClick(primaryCode);
       switch (primaryCode) {
                   ...
         default: {
               if (isEmoji(primaryCode)) {
                     ...
               } else {
                   char c = (char) primaryCode;
                      ic.commitText(String.valueOf(Character.isLetter(c) && capsLock ?
                          c : Character.toUpperCase(c)), 1);
                        }
                    }

                }

How can I implement the isEmoji method?