Android Pie
Version of the Android operating system
Android Pie home screen with Pixel Launcher
August 6, 2018; 5 years ago (2018-08-06)
Final release9.0.0_r76 (PSV1.210329.021)[1] / January 4, 2022; 2 years ago (2022-01-04)
Final previewP Beta 4 / Developer Preview 5 (PPP5.180610.010) / August 25, 2018; 5 years ago (2018-08-25)
Kernel typeMonolithic (Linux)
Preceded byAndroid 8.1 "Oreo"
Succeeded byAndroid 10
Official Edit this at Wikidata
Support status
Unsupported as of January 4, 2022[1]

Android Pie (codenamed Android P during development), also known as Android 9 (API 28) is the ninth major release and the 16th version of the Android mobile operating system. It was first released as a developer preview on March 7, 2018, and was released publicly on August 6, 2018.

On August 6, 2018, Google officially announced the final release of Android 9 under the title "Pie", with the update initially available for current Google Pixel devices, and releases for Android One devices and others to follow "later this year". The Essential Phone was the first third-party Android device to receive an update to Pie, notably coming day-and-date with its final release.[2][3] The Sony Xperia XZ3 was the first device with Android Pie pre-installed.[4]

As of April 2024, 5.66% of all Android devices ran Android Pie, whose final security update was released on January 4, 2022.[5][1]


Android Pie, then referred to as "Android P", was first announced by Google on March 7, 2018,[6] and the first developer preview was released on the same day.[7] The second preview, the first beta release, was released on May 8, 2018.[8] The third preview, called Beta 2, was released on June 6, 2018.[9] The fourth preview, called Beta 3, was released on July 2, 2018.[10] The final beta of Android P was released on July 25, 2018.[11]

Custom distributions

See also: List of custom Android distributions

There are, as of August 2019, a handful of notable custom Android distributions (ROMs) of 9 Pie.


See also: Android version history § Android 9

User experience

Android Pie utilizes a refresh of Google's "material design" language, unofficially referred to as "Material Design 2.0". The revamp provides more variance in aesthetics, encouraging the creation of custom "themes" for the base guidelines and components rather than a standardized appearance. Bottom-aligned navigation bars are also more prominent. As applied to Android Pie's interface, rounded corners (influenced by the proprietary Google theme used by in-house software implementing Material Design 2.0) are more prominent.[12] In addition, Pie contains official support for screen cutouts ("notches"), including APIs and system behaviors depending on their size and position. Android certification requirements restrict devices to two cutouts, which may only be along the top or bottom of the screen.[12]

The most significant user interface change on Pie is a redesigned on-screen navigation bar. Unlike previous versions of Android, it only consists of a slim home button, and a back button rendered only when available. The bar utilizes gesture navigation: swiping up opens the "Overview" screen, a redesign of the existing recent apps menu. Swiping the handle to the right activates application switching. The gesture bar is used primarily on new devices such as the Pixel 3; existing devices may either use the previous navigation key setup or offer the ability to opt into gesture navigation.[13] As opposed to the previous recent apps menu, Overview utilizes a horizontal layout rather than vertical, and text may also be selected and copied from apps appearing there (although this uses OCR rather than the native text as to conserve resources). The Pixel Launcher exclusively supports the ability to access the app drawer and most recently used apps from the overview as well. However, this integration is proprietary, as there are no current plans to offer the necessary integration to third-party software due to security concerns.[12] In addition, when rotation lock is enabled, rotating the device causes a screen rotation button to appear on the navigation bar.[12]

The notification area was redesigned, with the clock moved to the left, and the number of icons that may be displayed at once limited to four, in order to accommodate displays that may have "notch" cutouts in the center.[13] The drop-down panels attached to quick settings items have been removed; long-pressing a toggle directs users to the relevant settings screen. Notifications for chats can now be threaded, displaying previous messages within (complementing the existing inline reply functionality). If a particular type of notification is frequently dismissed, the user will now be offered to disable it.[12] The Do Not Disturb mode has been overhauled with a larger array of settings.[12]

The power menu now contains a screenshot button (which itself now supports cropping an image after taking one), and an optional "lockdown" mode that disables biometric unlock methods.[13] The volume pop-up now only controls media volume, as well as the choice of sound, vibrate, or silent modes for notifications. Users are directed to the settings menu to change the volume of notifications.[13][14][15] A magnifier display has been added to text selection, and "smart linkify" offers access to relevant apps if particular types of text (such as phone numbers or addresses) are highlighted.[12]


Android Pie introduces a major change to power management, using algorithms to prioritize background activity by apps based on long-term usage patterns and predictions, dividing apps into "Active", "Working Set" (run often), "Frequent", "Rare", and "Never". Similar "adaptive brightness" settings are adjusted automatically based on detected lighting conditions. Both of these features were developed in collaboration with DeepMind.[12]

The "PrecomputedText" API (also available as a compatibility library compatible with Android 4.0 and newer) can be used to perform text display processing in a background thread as opposed to a UI thread to improve performance.[12]

The fingerprint authentication API has also been revamped to account for different types of biometric authentication experiences (including face scanning and in-screen fingerprint readers).[12]

Android Runtime can now create compressed bytecode files, and profiler data can be uploaded to Google Play servers to be bundled with apps when downloaded by users with a similar device.[12]

Apps targeting older Android API levels (beginning with Android 4.2) display a warning when launched. Google Play Store is now requiring all apps to target an API level released within the past year, and will also mandate 64-bit support in 2019.[12]

Android Pie supports IEEE 802.11mc, including Wi-Fi Round Trip Time for location positioning.[12]

The camera API now supports accessing multiple cameras at once.[12] Apps may no longer perform background audio or video recording unless they run a foreground service.[12] There is support for the High Efficiency Image File Format (subject to patent licensing and hardware support) and VP9 Profile 2.[12]

DNS over TLS is supported under the name "Private DNS".[16]

Android Go for Android Pie uses less storage than the previous release, and has enhancements to security and storage tracking.[17]


Shortly after its launch, several users on Pixel devices and the Essential Phone noted a decrease in battery life.[18] As Android Pie became available to more phones, some users on various devices reported similar comparisons.[19][20]

See also


  1. ^ a b c "Android Source". Google Git. Archived from the original on January 5, 2022. Retrieved September 10, 2019.
  2. ^ Welch, Chris (August 6, 2018). "The Essential Phone is being upgraded to Android 9 Pie on the same day as Google's Pixels". The Verge. Archived from the original on April 10, 2019. Retrieved April 10, 2019.
  3. ^ Bohn, Dieter (August 6, 2018). "Android 9 Pie is available for Google Pixel phones today". The Verge. Archived from the original on August 10, 2019. Retrieved April 10, 2019.
  4. ^ "Sony Xperia XZ3 unveiled: Big, curved OLED display!". GSMArena. Archived from the original on August 30, 2018. Retrieved August 30, 2018.
  5. ^ "Mobile & Tablet Android Version Market Share Worldwide". StatCounter Global Stats. Archived from the original on April 13, 2024. Retrieved April 13, 2024.
  6. ^ El Khoury, Rita (March 7, 2018). "Google announces Android P: Notch support, multi-camera API, indoor positioning, and more". Android Police. Illogical Robot LLC. Archived from the original on August 25, 2018. Retrieved March 7, 2018.
  7. ^ Whitwam, Ryan (March 7, 2018). "Android P developer preview images and OTA files are now live, but no beta program yet". Android Police. Illogical Robot LLC. Archived from the original on September 3, 2018. Retrieved March 7, 2018.
  8. ^ Burke, Dave (May 8, 2018). "What's new in Android P Beta". Android Developers Blog. Archived from the original on September 7, 2018. Retrieved August 17, 2018.
  9. ^ Burke, Dave (June 6, 2018). "Android P Beta 2 and final APIs!". Android Developers Blog. Archived from the original on January 15, 2019. Retrieved August 17, 2018.
  10. ^ Burke, Dave (July 2, 2018). "Android P Beta 3 is now available". Android Developers Blog. Archived from the original on July 2, 2018. Retrieved August 17, 2018.
  11. ^ Burke, Dave (July 25, 2018). "Final preview update, official Android P coming soon!". Android Developers Blog. Archived from the original on November 21, 2018. Retrieved August 16, 2018.
  12. ^ a b c d e f g h i j k l m n o p Amadeo, Ron (September 13, 2018). "Android 9 Pie, thoroughly reviewed". Ars Technica. Archived from the original on November 30, 2018. Retrieved January 25, 2019.
  13. ^ a b c d Bohn, Dieter (August 16, 2018). "Android 9 Pie review: the predictive OS". The Verge. Archived from the original on January 26, 2019. Retrieved January 25, 2019.
  14. ^ Rahman, Mishaal (March 7, 2018). "Here's Everything New in Android P Developer Preview 1 for the Google Pixel/XL and Pixel 2/XL". XDA Developers. Archived from the original on April 22, 2018. Retrieved March 8, 2018.
  15. ^ Welch, Chris (March 7, 2018). "The biggest early visual changes in Android P". The Verge. Archived from the original on June 22, 2018. Retrieved March 8, 2018.
  16. ^ Wallen, Jack (August 23, 2018). "How to enable DNS over TLS in Android Pie". TechRepublic. Archived from the original on September 11, 2018. Retrieved January 25, 2019.
  17. ^ Gartenberg, Chaim (August 15, 2018). "Android 9 Pie (Go edition) will make Android Go better this fall". The Verge. Archived from the original on August 16, 2018. Retrieved January 25, 2019.
  18. ^ Schoon, Ben (August 15, 2018). "Has your battery life been worse on Android 9 Pie? [Poll]". Archived from the original on February 3, 2019. Retrieved February 2, 2019.
  19. ^ "Android Pie has a battery life problem". November 1, 2018. Archived from the original on November 20, 2018. Retrieved November 2, 2018.
  20. ^ Siegal, Jacob (November 2, 2018). "Some users are experiencing terrible battery drain on Android Pie". Archived from the original on February 3, 2019. Retrieved February 2, 2019.