Android : ankushsachdeva emojicon display over softkeyboard (Android)

I implemented the ankushsachdeva emojicon project to display emojicons in my chat app. When i click on a specific chat i start my ChatActivity. If i then immediately click the emoji-imageButton which i made, without expanding the keyboard first, it looks like the left screenshot here

Afterwords, the emojicon-overlay is always displayed correctly. (right screenshot)

I want the overlay to always be like in the right screenshot. Any ideas? (thanks in advance)

ChatActivity:

private ListView listView; //contains the chatmessages and has a customAdapter 
private EmojiconsPopup popUp; //emojicon-popUp
private EditText editText; //editText to capture text and emojicons
private InputMethodManager inputManager;

@Override
protected void onCreate(Bundle savedInstanceState){
    listView = (ListView) findViewById(R.id.listView);

    //...//

    inputManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

    popUp = new EmojiconsPopup(listView, getApplicationContext());

    popUp.setSizeForSoftKeyboard();

    popUp.setOnEmojiconClickedListener(new OnEmojiconClickedListener(){
        @Override
        public void onEmojiconClicked(Emojicon emojicon){
            editText.append(emojicon.getEmoji());
        }
    });


    popUp.setOnEmojiconBackspaceClickedListener(new OnEmojiconBackspaceClickedListener(){
        @Override
        public void onEmojiconBackspaceClicked(View v){
            KeyEvent event = new KeyEvent(0, 0, 0, KeyEvent.KEYCODE_DEL, 0, 0, 0, 0, KeyEvent.KEYCODE_ENDCALL);
            editText.dispatchKeyEvent(event);
        }
    });

    popUp.setOnSoftKeyboardOpenCloseListener(new OnSoftKeyboardOpenCloseListener(){
        @Override
        public void onKeyboardOpen(int keyBoardHeight){
        }
        @Override
        public void onKeyboardClose(){
            if (popUp.isShowing())
                popUp.dismiss();
        }
    });
}

//called when the emojicon button is clicked
public void onEmojiButtonClicked(View view){
    if (!popUp.isShowing()){
        inputManager.showSoftInput(editText, InputMethodManager.SHOW_IMPLICIT);
        popUp.showAtBottom(); //show popUp with emojicons
    }else if(popUp.isShowing()){
        popUp.dismiss(); // hide popUp with emojicons
    }
}