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
As of March 1, 2016 for the Android Studio's emulator on Windows. The pinch key on the emulator is the Alt key. Hold down Alt and click and drag your mouse button.
The CTRL key might still work for you, but it doesn't work for me.