title: Showing a popup window when a menu item is selected
body: <p>I am trying to create a popup window when a certain menu item is pressed. I think I have most of the code, however I am not sure what to do for showAtLocation(...) or showAsDropDown(...). </p>
  
  <pre><code>public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
           ...
          case R.id.about:
            displayPopupWindow();
            return true;
           ...
        }
  }
  
  public void displayPopupWindow() {
      PopupWindow popup = new PopupWindow(this);
      View layout = getLayoutInflater().inflate(R.layout.popup, null);
      popup.setContentView(layout);
      popup.setOutsideTouchable(true);
      popup.setFocusable(true);
      popup.showAtLocation(??, Gravity.CENTER, 0, 0);
  }
  </code></pre>
  
  <p>What should i put for the view for the menu or should I do this another way? I hope that makes sense and thanks for the help!</p>