Android 7.1.1 includes the developer features already available on Pixel and Pixel XL devices and adds optimizations and bug fixes on top of the base Android 7.1 platform. With Developer Preview 2, you can make sure your apps are ready for Android 7.1.1 and the consumers that will soon be running it on their devices said by android developers on 22nd November - update to the Android 7.1 Developer Preview. This developer preview expanded to the range of devices such as Nexus 5X, Nexus 6P, Nexus 9, and Pixel C.
What's in this update?
Developer Preview 2 is a release candidate for Android 7.1.1 that you can use to complete your app development and testing in preparation for the upcoming final release. In includes near-final system behaviors and UI, along with the latest bug fixes and optimizations across the system and Google apps.
It also includes the developer features and APIs (API level 25) already introduced in Developer Preview 1. With Developer Preview 2, Android is also updating the SDK build and platform tools in Android Studio, the Android 7.1.1 platform, and the API Level 25 emulator system images. The latest version of the support library (25.0.1) is also available for you to add image keyboard support, bottom navigation and other features for devices running API Level 25 or earlier.
Google suggested If you have a supported device that's enrolled in the Android Beta Program, you'll receive an update to Developer Preview 2 over the coming week. If you haven't enrolled your device yet, just visit the site to enroll your device and get the update. In early December, Android 7.1.1 is going to roll out to the full lineup of supported devices as well as Pixel and Pixel XL devices.
How to Get started ?
Now is the time to optimize your apps to look their best on Android 7.1.1. To get started, an update to Android Studio 2.2.2 and then download the API Level 25 platform, emulator system images, and tools through the SDK Manager in Android Studio.
After installing the API Level 25 SDK, you can update your project's compileSdkVersion to 25 to build and test against the new APIs. If you're doing compatibility testing, we recommend updating your app's targetSdkVersion to 25 to test your app with compatibility behaviors disabled.
If you're adding app shortcuts or circular launcher icons to your app, you can use Android Studio's built-in Image Asset Studio to quickly help you create icons of different sizes that meet the material design guidelines. You can test your round icons on the Google APIs emulator for API Level 25, which includes support for round icons and the new Google Pixel Launcher.
If you're adding image keyboard support, you can use the Messenger and Google Keyboard apps included in the preview system images for testing as they include support for this new API.
Android Studio and the Google APIs emulator let you quickly create and
test your round icon assets.
Scale your tests
To help scale your testing, make sure to take advantage of Firebase Test Lab for Android and run your tests in the cloud at no charge during the preview period on all virtual devices including the Developer Preview 2 (API 25). You can use the automated crawler (Robo Test) to test your app without having to write any test scripts, or you can upload your own instrumentation (e.g. Espresso) tests.
Publish your apps to alpha, beta or production channels in Google Play
After you've finished final testing, you can publish your updates compiled against, and optionally targeting, API 25 to Google Play. You can publish to your alpha, beta, or even production channels in the Google Play Developer Console. In this way, push your app updates to users whose devices are running Android 7.1, such as Pixel and Android Beta devices.
Get Developer Preview 2 on Your Eligible Device
If you have an eligible device that's already enrolled in the Android Beta Program, the device will get the Developer Preview 2 update over the coming week. No action is needed on your part. If you aren't yet enrolled in the program, the easiest way to get started is by visiting android.com/beta and opt-in your eligible Android phone or tablet -- you'll soon receive this preview update over-the-air. As mentioned above, this Developer Preview update is available for Nexus 5X, Nexus 6P, Nexus 9, and Pixel C devices.
Source : https://developer.android.com/
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