Android Lollipop

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Android 5.0 "Lollipop"
A release of the Android operating system
New (2014) logo for the Android devices platform.png
Android 5.0 "Lollipop" homescreen.jpg
Android 5.0 "Lollipop" home screen.
Developer Google
November 3, 2014; 2 months ago (2014-11-03)[1]
Latest release LRX22G / December 19, 2014; 44 days ago (2014-12-19)[2]
Latest preview LPX13D / October 17, 2014; 3 months ago (2014-10-17)[3]
Preceded by Android 4.4.4 "KitKat"
Official website

Android 5.0 "Lollipop" is the latest version of the Android mobile operating system developed by Google. Unveiled on June 25, 2014 during Google I/O, it became available through official over-the-air (OTA) updates on November 12, 2014, for select devices that run distributions of Android serviced by Google (such as Nexus and Google Play edition devices). Its source code was made available on November 3, 2014.

One of the most prominent changes in the Lollipop release is a redesigned user interface built around a design language referred to as "material design". Other changes include improvements to the notifications, which can be accessed from the lockscreen and displayed within applications as top-of-the-screen banners. Google also made internal changes to the platform, with the Android Runtime (ART) officially replacing Dalvik for improved application performance, and with changes intended to improve and optimize battery usage, known internally as Project Volta.


Android 5.0 was first unveiled under the codename "Android L" on June 25, 2014 during a keynote presentation at the Google I/O developers' conference. Alongside Lollipop, the presentation focused on a number of new Android-oriented platforms and technologies, including Android TV, in-car platform Android Auto, wearable computing platform Android Wear, and health tracking platform Google Fit.[4]

Part of the presentation was dedicated to a new cross-platform design language referred to as "material design". Expanding upon the "card" motifs first seen in Google Now, it is a design with increased use of grid-based layouts, responsive animations and transitions, padding, and depth effects such as lighting and shadows. Designer Matías Duarte explained that "unlike real paper, our digital material can expand and reform intelligently. Material has physical surfaces and edges. Seams and shadows provide meaning about what you can touch." The material design language will not only be used on Android, but across Google's suite of web software as well, providing a consistent experience across all platforms.[5][6][7][8][9]


Android 5.0 introduces a refreshed notification system. Individual notifications are now displayed on cards to adhere to the material design language, and batches of notifications can be grouped by the app that produced them. Notifications are now displayed on the lock screen as cards, and "heads up" notifications can also be displayed as large banners across the top of the screen, along with their respective action buttons.[6][10] A do-not-disturb feature is also added for notifications. The recent apps menu was redesigned to use a three-dimensional stack of cards to represent open apps. Individual apps can also display multiple cards in the recent menu, rather than only one entry per app; for example, a web browser can show all of its open tabs as individual cards.[6][8][11]

Lollipop also contains major new platform features for developers, with over 5,000 new APIs added for use by applications.[12][13] For example, there is the possibility to save photos in a raw image format.[14] Additionally, the Dalvik virtual machine was officially replaced by Android Runtime (ART), which is a new runtime environment that was introduced as a technology preview in KitKat.[15] ART is a cross-platform runtime which supports the x86, ARM, and MIPS architectures in both 32-bit and 64-bit environments. Unlike Dalvik, which uses just-in-time compilation (JIT), ART compiles apps upon installation, which are then run exclusively from the compiled version from then on. This technique removes the processing overhead associated with the JIT process, improving system performance.[16]

Lollipop also aims to improve battery consumption through a series of optimizations known as "Project Volta". Among its changes are a new battery saver mode, job scheduling APIs which can restrict certain tasks to only occur over Wi-Fi, and batching of tasks to reduce the overall amount of time that internal radios are active. The new developer tool called "Battery Historian" can be used for tracking battery consumption by apps while in use.[4][6] The Android Extension Pack APIs also provide graphics functions such as new shaders, aiming to provide PC-level graphics for 3D games on Android devices.[9][17]

A number of system-level, enterprise-oriented features were also introduced under the banner "Android for Work": Samsung contributed its Knox security framework for segregating personal and work-oriented data from each other on a device, along with accompanying APIs for managing the environment. Devices can also be configured so that users do not have to unlock their device with a PIN or pattern if it is within a trusted, physical location, or is in proximity to a user's Android Wear device.[11][18] Device encryption will be enabled by default.[19]


A developer preview of Android L, build LPV79,[20] was released for the Nexus 5 and 2013 Nexus 7 on June 26, 2014 in the form of flashable images. Source code for GPL-licensed components of the developer preview was released via Android Open Source Project (AOSP) in July 2014.[21][22] A second developer preview build, LPV81C, was released on August 7, 2014, alongside the beta version of the Google Fit platform and SDK. As with the previous build, the second developer preview build is available only for the Nexus 5 and 2013 Nexus 7.[20][23]

On October 15, 2014, Google officially announced that Android L would be known as Android 5.0 "Lollipop". The company also unveiled launch devices for Android 5.0—​including Motorola's Nexus 6 and HTC's Nexus 9—​for release on November 3, 2014.[24] Google stated that Nexus (including the Nexus 4, 5, 7, and 10) and Google Play edition devices would receive updates to Lollipop "in the coming weeks"; one more developer preview build for Nexus devices and the new SDK revision for application developers would be released on October 17, 2014. Update schedules for third-party Android devices may vary by manufacturer.[25][26]

The full source code of Android 5.0 was pushed to AOSP on November 3, 2014, allowing developers and OEMs to begin producing their own builds of the operating system.[27] On December 2, 2014, factory images for Nexus smartphones and tablets were updated to the 5.0.1 version, which introduces a few bug fixes,[28] and a serious bug[29] which affects Nexus 4 devices and prevents audio working during phone calls.[30] A device-specific Lollipop 5.0.2 (LRX22G) version was released for the first-generation Nexus 7 on December 19, 2014. It is unknown if this update will be released to the tablet's sibling models.[31]

As of January 2015, its adoption has been so low that it did not appear on Google's January 2015 Android distribution chart.[32]

See also[edit]


  1. ^
  2. ^
  3. ^
  4. ^ a b "From Android L to Google Fit: All the new products and features from Google I/O". PC World. Retrieved June 26, 2014. 
  5. ^ "Google's new 'Material Design' UI coming to Android, Chrome OS and the web". Engadget. Retrieved June 26, 2014. 
  6. ^ a b c d "Google Reveals Details About Android L at Google IO". Anandtech. Retrieved June 26, 2014. 
  7. ^ "Google's New, Improved Android Will Deliver A Unified Design Language". Co.Design. Retrieved June 26, 2014. 
  8. ^ a b "We just played with Android's L Developer Preview". Engadget. AOL. Retrieved June 26, 2014. 
  9. ^ a b "Google's next big Android redesign is coming in the fall". The Verge. Vox Media. Retrieved June 26, 2014. 
  10. ^ Smith, Chris. "Android L's heads up notifications feature arrives early through third-party app". Tech Radar. Future plc. Retrieved August 6, 2014. 
  11. ^ a b "Google I/O: Android L Sneak Peek Reveals ‘Material Design,’ Personal Unlocking and More". Wall Street Journal. Retrieved June 26, 2014. 
  12. ^ Mayton, Joseph. "Android L, LG G Watch, update issue and what reviewers are saying". Tech Times. Retrieved August 5, 2014. 
  13. ^ Haselton, Todd. "Android L Developer Preview Unveiled With Major Changes". Techno Buffalo. Retrieved August 5, 2014. 
  14. ^ Stephen Shankland (2014-12-19). "How Android 5.0 lets you get raw for better photos". CNET. Retrieved 2015-01-12. 
  15. ^ "'ART' experiment in Android KitKat improves battery life and speeds up apps". Engadget. Retrieved June 26, 2014. 
  16. ^ Andrei Frumusanu (July 1, 2014). "A Closer Look at Android RunTime (ART) in Android L". AnandTech. Retrieved July 5, 2014. 
  17. ^ "Android's next release will include GPU-focused tech for PC quality graphics". Polygon. Vox Media. Retrieved June 26, 2014. 
  18. ^ "With Android L, Google makes pitch for enterprise users". Computerworld. IDG. Retrieved June 26, 2014. 
  19. ^ "Newest Androids will join iPhones in offering default encryption, blocking police". The Washington Post. September 18, 2014. Retrieved September 18, 2014. 
  20. ^ a b Cory Gunther (August 7, 2014). "New Android L Update Arrives for Nexus Users". Retrieved August 9, 2014. 
  21. ^ "Google releases Android L preview source for Nexus devices". ZDNet. CBS Interactive. Retrieved July 2, 2014. 
  22. ^ Yi, Bill (July 2, 2014). "GPL projects for the l-preview release". android-building mailing list.!topic/android-building/R50i6JktFtI. Retrieved August 19, 2014.
  23. ^ "Google just released some hot new images of Android L – here’s how you can get them". PMC. Retrieved August 16, 2014. 
  24. ^ "Android: Be together. Not the same.". Official Google Blog. October 15, 2014. Retrieved October 23, 2014. 
  25. ^ "When and where to get Android 5.0 Lollipop". CNET. CBS Interactive. October 15, 2014. Retrieved October 16, 2014. 
  26. ^ "Updated Android Lollipop Developer Preview image coming to Nexus devices in a couple of days". PhoneArena. Retrieved October 16, 2014. 
  27. ^ "Android Lollipop hits AOSP; HTC sets the upgrade pace". SlashGear. Retrieved 24 December 2014. 
  28. ^ "Google quietly pushes out Android Lollipop 5.0.1 images". ZDNet. Retrieved December 6, 2014. 
  29. ^ Hussain, Shahzad. "Android Lollipop Bug will eat your Phone RAM". Retrieved 2 January 2015. 
  30. ^ "Nexus 4, lollipop 5.0.1: dialer calls audio does not work". Retrieved December 18, 2014. 
  31. ^ "Android 5.0.2 LRX22G Factory Image for Nexus 7 (WiFi) Randomly Shows Up". Retrieved December 21, 2014. 
  32. ^ Android 5.0 Lollipop adoption rate is so low it didn’t appear on Google’s distribution chart

External links[edit]