Quick facts: this ninth major Google mobile OS release is identified by API level 28, debuted for Pixel phones first on August 6, 2018, and introduced system-level features targeted at power efficiency and modern hardware (display cutouts, multi-camera streams, HEIF image compression).

Key technical changes: gesture-based navigation alternatives to classic buttons; Adaptive Battery (ML-driven background app restrictions); adaptive brightness tuning; official support for display notches; multi-camera API for logical and physical camera combinations; notifications with inline smart replies and image previews; tightened background access to microphone and camera for privacy.

Upgrade checklist: 1) Back up user data and app settings. 2) Charge battery >50% and connect to stable Wi‑Fi. 3) Check your OEM’s update page or device Settings → System → System update for the official OTA. 4) For Pixel devices, factory images and full OTAs are available from Google if manual flashing is required. 5) Verify critical apps for compatibility before committing to the upgrade.

Developer guidance: target and test against API level 28 to validate behavior changes – especially background execution limits, privacy restrictions on sensors and identifiers, and power-management heuristics. Use emulators or physical hardware running version nine to catch runtime differences and ensure libraries are up to date.

Security and lifecycle advice: devices that continue to receive vendor patches on this release remain acceptable for everyday use; devices without active security updates should be replaced or migrated to maintained builds (official vendor firmware or supported custom builds). Check vendor security bulletins and monthly patch availability before relying on an older device.

Official Name and Pronunciation

Use the numeric designation "version 9" (short: v9, API level 28) in documentation; use the dessert moniker only for informal or marketing copy, and indicate its pronunciation when needed.

Pronunciation: single syllable, IPA /paɪ/ (diphthong [aɪ], rhymes with "eye"); stress falls on that sole syllable. Provide /paɪ/ in phonetic guides or captions to avoid ambiguity across accents.

Styling rules: prefer the numeral "9" rather than the spelled-out form in technical contexts – e.g., "version 9 (v9, API level 28)". In headlines or consumer-facing text, append the dessert moniker after the numeric label and include the phonetic cue in parentheses when first mentioned.

Localization and translation: keep the numeric label untranslated; for the moniker either retain the original term with a local phonetic respelling or use an approved localized equivalent only if officially provided. Always include API level 28 in technical translations to maintain precision.

Legal and usage notes: the dessert moniker is part of the vendor's marketing assets; verify brand guidelines before using it in third-party materials. For spoken media, instruct narrators to use a steady, single-beat delivery on /paɪ/ rather than stretching the vowel.

Official release name

Use the release identifier "9.0" together with the public dessert moniker "Pie" and API level 28 when labeling this platform version.

• 
  
• Stable release date: August 6, 2018.
  
• Primary API level: 28.
  
• Initial factory build for Pixel family: PPR1.180610.009.
  
• SDK package: SDK Platform 28 (use platform tools and system images tagged 28 for emulators and CI).
  
• Runtime and manifest checks: test against Build.VERSION.SDK_INT == 28 and set targetSdkVersion = 28 for compatibility verification.
  
• Documentation format recommendations:
  
  • 
    
  • User-facing: "9.0 Pie".
    
  • Technical headers and changelogs: "9.0, API level 28, build PPR1.180610.009" (include security patch level date where relevant).
    
  
  
  
• Testing checklist:
  
  1. 
     
  2. Run CTS/GTS or vendor test suites on API 28 system images.
     
  3. Validate vendor binaries with the factory build ID listed above.
     
  4. Confirm behavior for runtime permissions, gesture navigation, and privacy changes introduced in the 9.0 release.
     
  
  
  

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