Zooming an imageview to the full screen

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http://stackoverflow.com – I have a xml. Which has a relative layout. And on that layout there are some TextFields. In the middle of the relative layout there is an ImageView. I want to pinch zoom that imageView so that it can even be zoomed to the full screen. Now I can only zoom inside the ImageView. Like the ImageView is a screen and the zooming occurs only inside it. But I want to zoom relative to the whole screen. When the image is zoomed I want the TextFields to maintain there position but they should be covered when the image is zoomed. Is there any way to do it? Thanks. (HowTos)