popUp = popupWindows(true);
popUp.showAsDropDown(txtYear, 0, 0);
--------------------------
  private PopupWindow popupWindows(boolean isYear) {

        ArrayList<String> mListArray = new ArrayList<>();

        if (isYear) {
            Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            for (int i = 0; i < 20; i++) {
                mListArray.add((year + i) + "");
            }
        } else {

            for (int i = 1; i <= 12; i++) {

                mListArray.add(i < 10 ? "0" + i : "" + i);
            }


        }

        final PopupWindow popupWindow = new PopupWindow(getContext());

        ArrayAdapter<String> adapter = new ArrayAdapter<>(getContext(), R.layout.custom_spinner_layout, mListArray);
        final ListView listViewSort = new ListView(getContext());
        listViewSort.setAdapter(adapter);

        listViewSort.setOnItemClickListener((adapterView, view, i, l) -> {
            if (isYear) {
                txtYear.setText("" + mListArray.get(i));
            } else {
                txtMonth.setText("" + mListArray.get(i));
            }

            popupWindow.dismiss();
        });
        popupWindow.setFocusable(true);
        int width = (int) getResources().getDimension(R.dimen._130sdp);
        popupWindow.setWidth(width);
        popupWindow.getAnimationStyle();
        popupWindow.setBackgroundDrawable(new ColorDrawable(Color.WHITE));
        popupWindow.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);
        popupWindow.setContentView(listViewSort);
        return popupWindow;
    }
 @estaticdev123