popup = new PopupWindow(context);
popup.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
popup.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);

Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpSize, context.getResources().getDisplayMetrics()));

View popup = LayoutInflator.inflate(int resId);
if(popup != null) {

    // set up an observer that will be called once the listView's layout is ready
    android.view.ViewTreeObserver viewTreeObserver = listView.getViewTreeObserver();
    if (viewTreeObserver.isAlive()) {

        viewTreeObserver.addOnGlobalLayoutListener(new android.view.ViewTreeObserver.OnGlobalLayoutListener() {

            @Override
            public void onGlobalLayout() {

                // This will be called once the layout is finished, prior to displaying.

                View popup = findViewById(resId);

                if(popup != null) {
                    int width = popup.getMeasuredWidth();
                    int height = popup.getMeasuredHeight();

                    // don't need the listener any more
                    popup.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                }
            }
        });
    }
}

Display display = getWindowManager().getDefaultDisplay();
Log.e("", "" + display.getHeight() + " " + display.getWidth());