Google is trying to make Android more and more advanced. They are working on new Password-free login system for Android devices.
Do you remember Project Abacus Google's last years announcement in Google I/O 2015? Project Abacus, is an effort aimed password-free logins system, which works on various factors to pass the password security like your typing and walking patterns, location and voice as well. Basically, this system will open password of your device for your If all factors perfectly matches.
Company started working on that project and confirmed that new password-free system for Android will be available for all Android developers by end of the year 2016.
Currently project is in under 30 universities in the US, & it will be tested by some very large financial institutions.
Here is Google's Words by Daniel Kaufman (Head of ATAP) : "And assuming it goes well, this should become available to every Android developer around the world by the end of the year,"