EmojiEditTextHelper

 public class MyEmojiEditText extends EditText {
      public MyEmojiEditText(Context context) {
          super(context);
          init();
      }
      // ...
      private void init() {
          super.setKeyListener(getEmojiEditTextHelper().getKeyListener(getKeyListener()));
      }

      @Override
      public void setKeyListener(android.text.method.KeyListener keyListener) {
          super.setKeyListener(getEmojiEditTextHelper().getKeyListener(keyListener));
      }

      @Override
      public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
          InputConnection inputConnection = super.onCreateInputConnection(outAttrs);
          return getEmojiEditTextHelper().onCreateInputConnection(inputConnection, outAttrs);
      }

      private EmojiEditTextHelper getEmojiEditTextHelper() {
          if (mEmojiEditTextHelper == null) {
              mEmojiEditTextHelper = new EmojiEditTextHelper(this);
          }
          return mEmojiEditTextHelper;
      }
 }