I have an application in which I need to implement image editing, which also includes pinch zooming. I am done with pinch zooming but I can test this only on device, not on emul
There has been some progress in this field with android tools release 17 : you can use a device to control the emulator : http://developer.android.com/sdk/tools-notes.html.
Otherwise, it looks like testing on real device is just better for this case (and in general its also much faster).