Google announced Android botbot rana 4.1 (Jelly Bean) at the [[Google I/O]] conference on 27 June 2012. Based on Linux kernel 3.0.31, Jelly Bean was an incremental update with the primary aim of improving the functionality and performance of the user interface. The performance improvement involved "Project Butter", which uses touch anticipation, [[Multiple buffering|triple buffering]], extended [[vsync]] timing and a fixed frame rate of 60 [[frames per second|fps]] to create a fluid and "buttery-smooth" UI.<ref>{{cite web|url=http://developer.android.com/about/versions/jelly-bean.html|title=Android 4.1 for Developers|accessdate=27 June 2012}}</ref> Android 4.1 Jelly Bean was released to the [[AOSP#Android_Open_Source_Project|Android Open Source Project]] on 9 July 2012,<ref>{{cite web|last=Queru|first=Jean-Baptiste|title=Android 4.1 in AOSP|url=https://groups.google.com/forum/#!topic/android-building/XBYeD-bhk1o|accessdate=12 July 2012}}</ref> and the [[Nexus 7]] tablet, the first device to run Jelly Bean, was released on 13 July 2012.<ref>{{cite web|url=http://blog.gsmarena.com/nexus-7-gets-android-4-1-1-update-adds-support-for-google-wallet/ |title=Android 4.1.1 Nexus 7 Update|accessdate=12 July 2012}}</ref>
Google was expected to announce Jelly Bean v4.2 at an event in [[New York City]] on 29 October 2012, but the event was cancelled due to [[Hurricane Sandy]].<ref>{{cite web|url=http://www.androidcentral.com/monday-s-google-event-nyc-cancelled-due-hurricane-sandy |title=Monday's Google event in NYC canceled due to Hurricane Sandy |accessdate=29 October 2012}}</ref> The new version was announced with a press release instead of rescheduling the live event, under the slogan "A new flavor of Jelly Bean". The first devices to run Android 4.2 will be [[LG]]'s [[Nexus 4]] and [[Samsung]]'s [[Nexus 10]], which will be released on 13 November 2012.
