Program Overview
Welcome to the Android O Developer Preview, a program that gives you everything you need to make your apps compatible and build for the next version of Android. It's free, and you can get started right away just by downloading the Preview tools
The O Developer Preview runs from 21 March 2017 until the final Android O public release to AOSP and OEMs, planned for Q3 2017.
At key development milestones, we’ll deliver updates for your development and testing environment. Each includes SDK tools, preview system images, emulators, API reference, and API diffs. The milestones are listed below.
Preview 1 (initial release, alpha)Preview 2 (incremental update, beta)Preview 3 (final APIs and official SDK, Play publishing)Preview 4 (near-final system images for final testing)Final release to AOSP and ecosystem
For developers, the focus during the early part of the preview is on making sure your current app is compatible with the new platform, and providing early feedback. In the later part of the preview — but ongoing throughout and beyond the preview — is your work to adopt features in your app and target the new platform.
Program Overview
Welcome to the Android O Developer Preview, a program that gives you everything you need to make your apps compatible and build for the next version of Android. It's free, and you can get started right away just by downloading the Preview tools.
Hardware and emulator system images
Run and test your apps on Nexus 5X, 6P, Player, Pixel C, Pixel, and Pixel XL, as well as the emulator.
Latest platform code
We’ll provide multiple updates during the Preview, so you’ll be testing against the latest platform changes.
New behaviors and capabilities
Start work early to support new platform behaviors such as the new runtime permissions model and power-saving features.
Feedback and support
Report issues and give us feedback using our issue tracker. Connect with other developers in the Developer Community.
Timeline and updates

The O Developer Preview runs from 21 March 2017 until the final Android O public release to AOSP and OEMs, planned for Q3 2017.
At key development milestones, we’ll deliver updates for your development and testing environment. Each includes SDK tools, preview system images, emulators, API reference, and API diffs. The milestones are listed below.
Preview 1 (initial release, alpha)Preview 2 (incremental update, beta)Preview 3 (final APIs and official SDK, Play publishing)Preview 4 (near-final system images for final testing)Final release to AOSP and ecosystem
For developers, the focus during the early part of the preview is on making sure your current app is compatible with the new platform, and providing early feedback. In the later part of the preview — but ongoing throughout and beyond the preview — is your work to adopt features in your app and target the new platform.
Please see the migration guide for easy steps to make your app compatible with the new platform, then target the new platform when you're ready.
The first two preview milestones provide an early test and development environment that help you identify compatibility issues in your current apps and plan migration or feature work needed to target the new platform. This is the priority period in which to give us your feedback on features and APIs and file compatibility issues — for all of these, please use the issue tracker. You can expect some API changes across these updates.
At previews 3 and 4 you’ll have access to the final O APIs and SDK to develop with, as well as near-final system images to test system behaviors and features. Android O will provide a standard API level at this time. You can begin final compatibility testing of your legacy apps and refine any new code that is using the O APIs or features.
Also starting in preview 4, you’ll be able to publish apps to devices running Android O at the official API level, such as consumer devices that have opted into the Android Beta program. You can publish into the Google Play alpha and beta channels first, so you can test your apps with Android Beta consumers before distributing broadly on the store.
As you test and develop on Android O, we strongly recommend keeping your development environment up-to-date as preview updates are released.
Google has done it again, releasing the Developer Preview of its next Android operating system ahead of its annual Google I/O developer's conference - exciting news for the increasing number of Android users across the globe.
According to new research from StatCounter, Android is now the world's number-one operating system for getting online, ahead of both Windows and iOS. In March 2017 it had39.93 percent market share, versus Windows'37.91 percent.
The first build of Android O offers insight into what's coming next to the mobile OS. However, you won't find the update on the Android Beta site. In fact you won't be able to use this site at all right now, since Google has ended the Android N beta programme, which may suggest an Android O public beta will be available very soon - likely at Google I/O next week.
The first build is available for Nexus 5X, Nexus 6P, Nexus Player, Pixel C, Pixel and Pixel XL, but must be manually flashed on to a device and is not intended for consumer use. Also see: How to download Android O
The final version of Android N was released in August 2016 as Android Nougat, and we're looking at a similar time frame in 2017 for the release of Android O, for which we will hear more details at Google I/O on 17 May.
Read on for more information on what we know about Android O so far.
Welcome to the Android O Developer Preview, a program that gives you everything you need to make your apps compatible and build for the next version of Android. It's free, and you can get started right away just by downloading the Preview tools
The O Developer Preview runs from 21 March 2017 until the final Android O public release to AOSP and OEMs, planned for Q3 2017.
At key development milestones, we’ll deliver updates for your development and testing environment. Each includes SDK tools, preview system images, emulators, API reference, and API diffs. The milestones are listed below.
Preview 1 (initial release, alpha)Preview 2 (incremental update, beta)Preview 3 (final APIs and official SDK, Play publishing)Preview 4 (near-final system images for final testing)Final release to AOSP and ecosystem
For developers, the focus during the early part of the preview is on making sure your current app is compatible with the new platform, and providing early feedback. In the later part of the preview — but ongoing throughout and beyond the preview — is your work to adopt features in your app and target the new platform.
Program Overview
Welcome to the Android O Developer Preview, a program that gives you everything you need to make your apps compatible and build for the next version of Android. It's free, and you can get started right away just by downloading the Preview tools.
Hardware and emulator system images
Run and test your apps on Nexus 5X, 6P, Player, Pixel C, Pixel, and Pixel XL, as well as the emulator.
Latest platform code
We’ll provide multiple updates during the Preview, so you’ll be testing against the latest platform changes.
New behaviors and capabilities
Start work early to support new platform behaviors such as the new runtime permissions model and power-saving features.
Feedback and support
Report issues and give us feedback using our issue tracker. Connect with other developers in the Developer Community.
Timeline and updates

The O Developer Preview runs from 21 March 2017 until the final Android O public release to AOSP and OEMs, planned for Q3 2017.
At key development milestones, we’ll deliver updates for your development and testing environment. Each includes SDK tools, preview system images, emulators, API reference, and API diffs. The milestones are listed below.
Preview 1 (initial release, alpha)Preview 2 (incremental update, beta)Preview 3 (final APIs and official SDK, Play publishing)Preview 4 (near-final system images for final testing)Final release to AOSP and ecosystem
For developers, the focus during the early part of the preview is on making sure your current app is compatible with the new platform, and providing early feedback. In the later part of the preview — but ongoing throughout and beyond the preview — is your work to adopt features in your app and target the new platform.
Please see the migration guide for easy steps to make your app compatible with the new platform, then target the new platform when you're ready.
The first two preview milestones provide an early test and development environment that help you identify compatibility issues in your current apps and plan migration or feature work needed to target the new platform. This is the priority period in which to give us your feedback on features and APIs and file compatibility issues — for all of these, please use the issue tracker. You can expect some API changes across these updates.
At previews 3 and 4 you’ll have access to the final O APIs and SDK to develop with, as well as near-final system images to test system behaviors and features. Android O will provide a standard API level at this time. You can begin final compatibility testing of your legacy apps and refine any new code that is using the O APIs or features.
Also starting in preview 4, you’ll be able to publish apps to devices running Android O at the official API level, such as consumer devices that have opted into the Android Beta program. You can publish into the Google Play alpha and beta channels first, so you can test your apps with Android Beta consumers before distributing broadly on the store.
As you test and develop on Android O, we strongly recommend keeping your development environment up-to-date as preview updates are released.
Google has done it again, releasing the Developer Preview of its next Android operating system ahead of its annual Google I/O developer's conference - exciting news for the increasing number of Android users across the globe.
According to new research from StatCounter, Android is now the world's number-one operating system for getting online, ahead of both Windows and iOS. In March 2017 it had39.93 percent market share, versus Windows'37.91 percent.
The first build of Android O offers insight into what's coming next to the mobile OS. However, you won't find the update on the Android Beta site. In fact you won't be able to use this site at all right now, since Google has ended the Android N beta programme, which may suggest an Android O public beta will be available very soon - likely at Google I/O next week.
The first build is available for Nexus 5X, Nexus 6P, Nexus Player, Pixel C, Pixel and Pixel XL, but must be manually flashed on to a device and is not intended for consumer use. Also see: How to download Android O
The final version of Android N was released in August 2016 as Android Nougat, and we're looking at a similar time frame in 2017 for the release of Android O, for which we will hear more details at Google I/O on 17 May.
Read on for more information on what we know about Android O so far.
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