Android 4.1 Jelly Bean sticks to the foundation laid by Ice Cream Sandwich more than half a year ago. There are very few visual user interface changes, but some cool added functionality. Of course, as with every previous Android release, the bootscreen animation has also been updated.
Project Butter is Google's answer to the oft-criticized Android user interface stutters and is probably the most important new feature of Android Jelly Bean. Cool animations have been an integral part of Android for quite some time now, but the problem was that they weren't always perfectly smooth. Even really powerful smartphones and tablets were guilty of the lagging occasionally and it was about time Google did something about it.
In fact, Google has worked so hard on these performance optimizations that it even borrowed the services of a high-speed RED camera to record the improvements throughout the UI. Check it out.
To get the interface so fluid and smooth, Google has made Jelly Bean's UI run at 60 frames per second where the hardware allows it. Since software engineers didn't stop there, they also added triple buffering (CPU, GPU and display working in parallel, not waiting in turns).
Finally, there's the feature called Touch responsiveness, which makes your phone anticipate and predict where your finger will be on the screen next and preloads any animations it might need to display when you start touching the screen.
The result, as you saw in the video above is an interface you can safely call "smooth as butter".
The lockscreen for example is altered and now shows a large dotted circle around the center-placed unlock button. You still the two familiar shortcuts - move the unlock button to the left for camera, and right for unlock. There's a new, third icon above them for jumping to Google Voice Search.
We still feel Google isn't utilizing the lockscreen to its fullest, though. A small weather widget would've come in handy, or even a short calendar snippet showing the upcoming appointments. We've seen those in some of the custom launchers, but it would be great if they were backed into the OS itself.
One of the best bits about Jelly Bean is its revamped notification center. It features a redesigned clock and date icons on the top left followed by a larger settings icon. The clear notifications icon has also been refreshed and it looks much sharper now.
The updates here don't end with the looks, either. Select app notifications have gotten really smart, not only delivering you the notification, but also providing you with several options for interaction.
For example, you can snooze a reminder for an upcoming meeting or email its guests right from the notification area. This is quite convenient, saving you a few seconds from the time you'd normally spend tapping your way through the app to get the same thing done.
Next, you can answer or hang up a call right from the notification blind. Yes, this feature was present in previous Android releases too, but now it's icons have been redesigned don't feel out of place.
Finally, starting with Jelly Bean, you can view photos shared with you on Google+ or even read your incoming messages without even having to enter the Messaging app.
Ice Cream Sandwich introduced resizable widgets, and they have been further improved in Android 4.1 Jelly Bean. With the latest release of the Google OS widgets will automatically adjust their size to fit on the screen where you'd want to put.
This means that if you place a widget in an icon-congested screen, the widget will contract to fit in whatever gap is available for it. Also, if you drag one widget on top of the other, it will make space for itself by forcing the icons underneath to rearrange.