the best way to pinch to zoom an imageview

What is the best way to pinch-to-zoom an imageview in And开发者_JS百科roid, because i've been searching this for a long long time. Is there some tutorial, or example ? I just want some tips to guide me in the right direction.

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you can use scalegesturedetector see here http://android-developers.blogspot.com/2010/06/making-sense-of-multitouch.html

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If you want more fine grained control you can subclass ImageView handle the touch events and directly manipulate the matrix of the canvas backing it during your onDraw calls.

It's a lot more complex but for my project it turned out to be the best solution.