Android 4.4 KitKat

Google announced Android 4.4 KitKat, internally known as Project Svelte,[121] on 3 September 2013.[122] The release had long been expected by technology bloggers to be numbered 5.0 and called "Key Lime Pie".[123] KitKat debuted on Google's Nexus 5, and has been optimised to run on a greater range of devices than earlier Android versions, having 512 MB of RAM as a recommended minimum.[121]
Version	Release date	Features	Image(s)
4.4	31 October 2013[124][125]	Refreshed interface with white elements instead of blue Ability for applications to trigger translucency in the navigation and status bars[126] Ability for applications to use "immersive mode" to keep the navigation and status bars hidden while maintaining user interaction[127] Action overflow menu buttons are always visible, even on devices with a hardware "Menu" key, which was officially deprecated by Android 4.0[128] Optimizations for performance on devices with lower specifications, including zRAM support and "low RAM" device API[121] Wireless printing capability[121] NFC host card emulation, enabling a device to replace smart cards[121] WebViews now based on Chromium engine (feature parity with Chrome for Android 30) Expanded functionality for notification listener services[121] Public API for developing and managing text messaging clients[129] New framework for UI transitions Storage access framework for retrieving content and documents from other sources Sensor batching, step detector and counter APIs[121] Settings application now makes it possible to select default text messaging and home (launcher) application Audio tunneling, audio monitoring, loudness enhancer Built-in screen recording feature (primarily for developers, as usage of ADB is required)[130] Native infrared blaster API Expanded accessibility APIs and system-level closed captioning settings New experimental runtime virtual machine, ART (not enabled by default)[131] Bluetooth Message Access Profile (MAP) support[132] Disabled access to battery statistics by third-party applications[133] Settings application no longer uses a multi-pane layout on devices with larger screens Wi-Fi and mobile data activity (TX/RX) indicators are moved to quick settings[134] Applications' access to secondary storage (memory cards on devices with internal primary storage) is restricted to their designated private directories only, while full access to internal primary storage is still allowed[135]	Android 4.4 on the Nexus 4
4.4.1	5 December 2013[136]	Improvements to auto focus, white balance and HDR+ for the Nexus 5 camera[137][138] Better application compatibility for the experimental ART runtime Camera application now loads Google+ Photos instead of Gallery when swiping away from the camera view Miscellaneous improvements and bug fixes
4.4.2	9 December 2013[139]	Further security enhancements and bug fixes Removal of the "App Ops" application permissions control system, introduced in Android 4.3