Android图库适配器与MultiTouch？自定义图库或自定义ImageView？

I would like to recreate the same type of app as Gallery3D but simpler: without the 3D animations and basically only keep GridView and Gallery widgets. I would also like to enable multi-touch zooming-dragging-scolling on the selected image and that's where I am struggling. I looked online for simple tutorials and I also looked at the Gallery3D source code but couldn't find a proper solution.I would like to recreate the same type of app a