How to Set Google Now to Always On in Android 5.0

[rutherfordsc]

Configure your phone to wake Google's voice assistant any time you say "Ok, Google."

How to Set Google Now to Always On in Android 5.0 : Read more

 

[Sai ashish]

For that download the official Google now launcher.(app by Google itself).your phone will start to look like a nexus.
Tap and hold on the home screen.then click on settings.there will be the option in one of the menus