Android 4.0 builds on the things people love most about Android - easy multitasking, rich notifications, customization home screens, re sizable widgets, and deep interactivity and adds powerful new ways of communicating and sharing.
2: Jelly Bean
Welcome to android jelly bean 4.3.
Android 4.3 includes performance optimizations and great new features for users and developers. This document provides a glimpse of what's new for developers. Android 4.3 builds on the performance improvements already included in Jelly Bean
You can visualize app-specific events in a timeline in the Systrace output file and analyze the events in the context of other kernel and user space trace data. Together with existing Systrace tags, custom app sections can give you new ways to understand the performance and behavior of your apps.
3: Kitkat
Welcome to Android 4.4 Kitkat
Android KitKat brings all of Android's most innovative, most beautiful, and most useful features to more devices everywhere.Android 4.4 is designed to run fast, smooth, and responsively on a much broader range of devices than ever before — including on millions of entry-level devices around the world that have as little as 512 MB Ram.
KitKat streamlines every major component to reduce memory use and introduces new APIs and tools to help you create innovative, responsive, memory-efficient applications.
4: Lollipop
welcome to Android 5.0 Lollipop he largest and most ambitious release for Android yet!
This release is packed with new features for users and thousands of new APIs for developers. It extends Android even further, from phones, tablets, and wearable, to TVs and cars.
Android 5.0 brings materiel design to Android and gives you an expanded UI toolkit for integrating the new design patterns easily in your apps.
Ripple animations are available for buttons, check boxes, and other touch controls in your app.
You can also define vector draw able in XML and animate them in a variety of ways. Vector draw able scale without losing definition, so they are perfect for single-color in-app icons.