Android Lollipop

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Android Lollipop
A version of the Android operating system
New (2014) logo for the Android devices platform.png
Android 5.0-en.png
Android "Lollipop" home screen, with proprietary applications
Developer Google
November 3, 2014; 10 months ago (2014-11-03)[1]
Latest release LVY48F[2] / September 9, 2015; 24 days ago (2015-09-09)
Latest preview LPX13D / October 17, 2014; 11 months ago (2014-10-17)
Preceded by Android 4.4.x "KitKat"
Succeeded by Android 6.0 "Marshmallow" (developer preview 3)
Official website

Android Lollipop is a version of the Android mobile operating system developed by Google, spanning versions between 5.0 and 5.1.1.[3] Unveiled on June 25, 2014, during the Google I/O conference, 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 Material Design as a new design language. 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.

As of June 2015, statistics issued by Google indicate that 12.4% of all Android devices accessing Google Play run Lollipop.[4]

Lollipop is succeeded by Android Marshmallow, unveiled in May 2015, which is in a state of developer preview as of August 2015.[5]


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.[6]

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.[7][8][9][10][11]


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.[8][12] 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 recents menu, such as for a web browser's open tabs.[8][10][13]

Lollipop also contains major new platform features for developers, with over 5,000 new APIs added for use by applications.[14][15] For example, there is the possibility to save photos in a raw image format.[16] 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.[17] 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.[18]

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.[6][8] 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.[11][19]

A number of system-level, enterprise-oriented features were also introduced under the banner "Android for Work". The Samsung Knox security framework was initially planned to be used as a foundation for "Android for Work", but instead Google opted to use its own technology for segregating personal and work-oriented data on a device, along with the accompanying APIs for managing the environment.[20] With the "Smart Lock" feature, devices can also be configured so users do not have to perform device unlocking with a PIN or pattern when being on a trusted location, or in proximity of a designated Bluetooth device or NFC tag.[21][13][22] Device encryption will be enabled by default;[23] as a result, Cyrus Vance, Jr., the Manhattan District Attorney, said on September 26, 2014 that Congress should act to preserve the ability of law enforcement agencies to extract data from phones.[24]


A screenshot of Lollipop's logo.

A developer preview of Android L, build LPV79,[25] 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.[26][27] 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.[25][28]

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.[29] 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.[30][31]

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.[32] 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,[33] and a serious bug that affects Nexus 4 devices and prevents the audio from working during phone calls.[34] A device-specific Lollipop 5.0.2 (LRX22G) version was released for the first-generation Nexus 7 on December 19, 2014.[35]

Android 5.1, an updated version of Lollipop, was unveiled in February 2015 as part of the Indonesian launch of Android One, and is preloaded on Android One devices sold in Indonesia and the Philippines. Google officially announced 5.1 by releasing updates for existing devices on March 9, 2015.[36][37]

As of June 2015, statistics issued by Google indicate that 12.4% of all Android devices accessing Google Play run Lollipop.[4]


All of the Google's official Android 5.x releases for its Nexus line of devices (Nexus 4, 5, 7, 9 and 10) are plagued by a memory leak issue, which remains unsolved as of July 2015.[38][39][40] This issue is apparently resolved in Android 6.0.

See also


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  2. ^ "android-5.1.1_r18 – platform/build – Git at Google". Retrieved September 9, 2015. 
  3. ^ "Android 5.1.1 (LMY47V) hits AOSP [CHANGELOG]". Retrieved June 21, 2015. 
  4. ^ a b "Dashboards: Platform Versions". May 4, 2015. Retrieved June 6, 2015. 
  5. ^ Chester, Brandon. "Google Announces Android M At Google I/O 2015". Anandtech. Purch, Inc. Retrieved May 28, 2015. 
  6. ^ a b "From Android L to Google Fit: All the new products and features from Google I/O". PC World. Retrieved June 26, 2014. 
  7. ^ "Google's new 'Material Design' UI coming to Android, Chrome OS and the web". Engadget. Retrieved June 26, 2014. 
  8. ^ a b c d "Google Reveals Details About Android L at Google IO". Anandtech. Retrieved June 26, 2014. 
  9. ^ "Google's New, Improved Android Will Deliver A Unified Design Language". Co.Design. Retrieved June 26, 2014. 
  10. ^ a b "We just played with Android's L Developer Preview". Engadget. AOL. Retrieved June 26, 2014. 
  11. ^ a b "Google's next big Android redesign is coming in the fall". The Verge. Vox Media. Retrieved June 26, 2014. 
  12. ^ Smith, Chris. "Android L's heads up notifications feature arrives early through third-party app". Tech Radar. Future plc. Retrieved August 6, 2014. 
  13. ^ a b "Google I/O: Android L Sneak Peek Reveals ‘Material Design,’ Personal Unlocking and More". Wall Street Journal. Retrieved June 26, 2014. 
  14. ^ Mayton, Joseph. "Android L, LG G Watch, update issue and what reviewers are saying". Tech Times. Retrieved August 5, 2014. 
  15. ^ Haselton, Todd. "Android L Developer Preview Unveiled With Major Changes". Techno Buffalo. Retrieved August 5, 2014. 
  16. ^ Stephen Shankland (2014-12-19). "How Android 5.0 lets you get raw for better photos". CNET. Retrieved 2015-01-12. 
  17. ^ "'ART' experiment in Android KitKat improves battery life and speeds up apps". Engadget. Retrieved June 26, 2014. 
  18. ^ Andrei Frumusanu (July 1, 2014). "A Closer Look at Android RunTime (ART) in Android L". AnandTech. Retrieved July 5, 2014. 
  19. ^ "Android's next release will include GPU-focused tech for PC quality graphics". Polygon. Vox Media. Retrieved June 26, 2014. 
  20. ^ Ina Fried (February 25, 2015). "Google Expands Its "Android for Work" Efforts in Bid to Get More Businesses Using Its Phones". Retrieved April 2, 2015. 
  21. ^ "How to set up Smart Lock on Android 5.0 Lollipop". CNET. Retrieved 2 July 2015. 
  22. ^ "With Android L, Google makes pitch for enterprise users". Computerworld. IDG. Retrieved June 26, 2014. 
  23. ^ "Newest Androids will join iPhones in offering default encryption, blocking police". The Washington Post. September 18, 2014. Retrieved September 18, 2014. 
  24. ^ Vance, Cyrus (September 26, 2014). "Apple and Google threaten public safety with default smartphone encryption". The Washington Post. Retrieved 10 July 2015. 
  25. ^ a b Cory Gunther (August 7, 2014). "New Android L Update Arrives for Nexus Users". Retrieved August 9, 2014. 
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  27. ^ Yi, Bill (July 2, 2014). "GPL projects for the l-preview release". android-building (Mailing list). Retrieved August 19, 2014. 
  28. ^ "Google just released some hot new images of Android L – here’s how you can get them". PMC. Retrieved August 16, 2014. 
  29. ^ "Android: Be together. Not the same.". Official Google Blog. October 15, 2014. Retrieved October 23, 2014. 
  30. ^ "When and where to get Android 5.0 Lollipop". CNET. CBS Interactive. October 15, 2014. Retrieved October 16, 2014. 
  31. ^ "Updated Android Lollipop Developer Preview image coming to Nexus devices in a couple of days". PhoneArena. Retrieved October 16, 2014. 
  32. ^ "Android Lollipop hits AOSP; HTC sets the upgrade pace". SlashGear. Retrieved 24 December 2014. 
  33. ^ "Google quietly pushes out Android Lollipop 5.0.1 images". ZDNet. Retrieved December 6, 2014. 
  34. ^ "Nexus 4, lollipop 5.0.1: dialer calls audio does not work". Retrieved December 18, 2014. 
  35. ^ "Android 5.0.2 LRX22G Factory Image for Nexus 7 (WiFi) Randomly Shows Up". Retrieved December 21, 2014. 
  36. ^ "Google officially announces Android 5.1". Ars Technica. Retrieved March 10, 2015. 
  37. ^ "Official Android Blog: Android 5.1: Unwrapping a new Lollipop update". Official Android Blog. Retrieved March 10, 2015. 
  38. ^ "Issue 169747 - android - Android 5.1.1 The memory leak is still present like in 5.1. - Android Open Source Project - Issue Tracker - Google Project Hosting". Retrieved 2015-10-02. 
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External links