Android Lollipop

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Android 5.0 "Lollipop"

A release of the Android operating system
Android 5.0 "Lollipop" home screen
Developer	Google
General availability	November 3, 2014; 30 days ago[1]
Latest release	LRX22C / December 2, 2014; 1 day ago[2]
Latest preview	LPX13D / October 17, 2014; 47 days ago[3]
Preceded by	Android 4.4.4 "KitKat"
Official website	Android

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 as official over-the-air (OTA) updates on November 12, 2014 for select devices that run distributions of Android serviced by Google, including 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 responsive design languagereferred 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.

1 Development

• 2 Features
• 3 Release

Development[edit]

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 cleaner 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]}

Features

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] 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.^[14] 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.^[15]

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 newshaders, aiming to provide PC-level graphics for 3D games on Android devices.^[9][16]

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][17] Device encryption will be enabled by default.^[18]

Release

A developer preview of Android L, build LPV79,^[19] 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.^[20][21]

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.^[19][22]

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.^[23] 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.^[24][25]

On November 3, 2014, Google made the Android Lollipop source code available, signifying that it had been released for general availability. Thus, manufacturers can now work on the 5.0 update for their devices. Factory images and OTA updates were made available for Google's own Nexus line of smartphones and tablets on November 12, 2014.