I'm coming from iphone and I really miss being able to launch siri by holding down the home button. Saying "ok google" is annoying and doesn't always work. Is there some way to make either the power or volume buttons activate the google voice search?
I've posted a feature request. Please comment and star it so the Android team takes notice.
Feature Request: Enable Voice Commands from Lock Screen
code.google.com/p/android/issues/detail?id=192606&thanks=192606&ts=1446584386