myMail Login Screen Animation

We're experimenting with the login screen in our Android email app. Here's one of these versions.

See high res for more details:
— Choose email provider — https://dribbble.com/shots/2381101-154-Mymail-Android-Login/attachments/458157
— Login — https://dribbble.com/shots/2381101-154-Mymail-Android-Login/attachments/458155
— Loading — https://dribbble.com/shots/2381101-154-Mymail-Android-Login/attachments/458158
— Success — https://dribbble.com/shots/2381101-154-Mymail-Android-Login/attachments/458156

Thanks to Creative Dash for the template — https://dribbble.com/shots/1645310-Nexus-5-PSD.