You have just bought an android phone, but you don’t like the look or layout. You can install a third party launcher like Nova, which can give you full control of the look and operation.
Well Nova has been updated to include “OK Google” hotword from the home screen. So now, just speak “Ok Google” and Google Search will jump to action.
Click link to Play Store https://play.google.com/store/apps/details?id=com.teslacoilsw.launcher&hl=en