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I've got a Button, and upon clicking it I would like to show a PopupWindow. The Window should be displayed just above the Button.

I have read: Android - PopupWindow above a specific view

where the approved answer is 

popupWindow.showAsDropDown(anchor, 0, -anchor.getHeight()-popupView.getHeight);

but the trouble is, I don't know what's the height of my popupWindow - it is created programatically, and before calling the showAsDropDown its getHeight method returns -2 ( WRAP_CONTENT? ).

If I use appropriate constant like so

popupWindow.showAsDropDown(anchor, 0, -anchor.getHeight()-530, Gravity.LEFT);

then it works. The question is thus more precisely 'how do I display a programatically created PopupWindow of height LayoutParams.WRAP_CONTENT above a given anchor View?'

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