Zoom Controls for ImageSwitcher in Android 1.6?

I wish to do the Image Switcher's Touch Event. That is when i touch it, it should wake up the zoom controls. After zoomed in, the image can able the touch scroll on the i开发者_高级运维mage up and down. how to do it? Is there any default zoom controls? If not, tell me your suggestion, idea and also valuable links about this? make a note the Target version is android 1.6.

I have used this in the past.