The Sony Ericsson guys did a tutorial on this:
http://blogs.sonyericsson.com/developerworld/2010/05/18/android-one-finger-zoom-tutorial-part-1/

On Sep 23, 3:31 pm, Ajmer Singh <ajmersing...@gmail.com> wrote:
> Hi All
>
> I need to implement the Image zoom in and zoom out functionality using the
> finger touch,like we have it in Android  phone Image gallery,
> Please let me know how can i do this in my app.Does any had done this
> before.
>
> Please help.
>
> --
> Thanks and Regards
> Ajmer Singh

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