5.0 lollipop - How to activate Google now voice commands from the lock screen like siri?

I just switched from an iPhone, and I want my android to have the same behavior as iOS where you hold the home button, and siri starts listening.

With my android, I have to wake up and unlock the device, then hold the home button to get to the google now screen, then I have to either say "okay google", or hit the microphone button.

This process takes way longer and makes voice commands in the car unsafe, which is primarily what I used siri for

Please any help would be appreciated

Answer

On my Samsung S6 this is how I did it:

settings > personal > lock screen and security > info and app shortcuts > app shortcuts > left shortcut > voice search

Now from the lock screen I can drag up from the bottom left and google starts listening.

note: Unfortunately if you have a password lock, you have to unlock the phone before it will answer your question.