I have recently implemented the revamped Google Login in an Android app.  
IMO this is an awesome user experience ... as long as you are ok with Google handling your credentials. Since you are using an Android phone with Play Services, you are supposed to be ok with that though ..<p>Something like Persona might have been a better solution, but in the meantime this is by far the best login solution on Android.<p>I have not been able to test Facebook in perfect conditions (I don&#x27;t want the app on my phone) but having to go through a webview is pretty annoying, and brings a ton of security issues.