How to position infoWindow on my map?

I have a RelativeLayout that holds some views. One of the views is MapView, basically a view that renders bitmap in a canvas.

Now I would like to implement some sort of information window.

I have created an layout for it with a FrameLayout holding a TextView. I use开发者_StackOverflow社区d 9patch on the image so its stretchable to hold any content.

I have implemented gesture (long press) on my MapView and I know the screen point where the infoWindow should be visible. Then I tried inflating the info window view and position it somehow ... but the problem is I cant measure it (the values are 0), so I have no idea how to position it over my map.

Any tip how to position my info window would be much appreciated.

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Anyway i moved the map, getting the selected location on the center and i inflate the info windows always on the center.