Posted by Jamal Eason, Product Manager, Android
With the launch Android N Developer Preview, we wanted to give you an easy and comprehensive way to build, test and validate your apps on the latest release with Android Studio. Built on the speed and feature enhancements of Android Studio 2.0, the stable release of Android Studio 2.1 includes updates to the IDE wizards, build system and Android Emulator so that you can try out new features and APIs of the developer preview including the new Jack compiler and Java 8 language support. In addition to support for the N Developer Preview, Android Studio 2.1 also includes performance improvements to Instant Run which leads to faster edit and deploy build speeds. If you are developing and validating your app with the N Developer Preview or want faster Instant Run speeds, you should download or update on the stable release channel to Android Studio 2.1.
Android Studio 2.1 includes the following new features:
- N Developer Preview Support: Android Studio 2.1 is the best IDE to test and validate your app with the N Developer Preview. Get the latest versions of the preview SDK, experiment with the new Java 8 support, and gain access to the only official Android Emulator able to run N Developer Preview Emulator System Images to help in your testing.
- Instant Run: For those of you who enjoyed the fast edit, build and deploy cycle with Android Studio 2.0, Instant Run now can now update incremental changes to your app code significantly faster.
Deeper Dive into the New Features
N Developer Preview
On top of new features and APIs of the N Developer Preview, Android Studio 2.1 release includes support for the new Jack compiler and support for Java 8. With the Jack compiler, lambdas, method references, compile-time type annotations, intersection types and type inference are available on all versions of the Android platform. Default and static methods and repeatable annotations are available on Android N and higher. To use Java 8 language features when developing with the N Developer Preview, you need to use the Jack compiler. The New Project Wizard [File→ New→ Project] generates the correct configurations for projects targeting the N.
Getting started with development is as easy generating a new project or updating a few settings in your existing project. Once you are ready to test, you can create a fresh Android Virtual Device (AVD) and run your app on the N Developer Preview using the new Android Emulator.
Instant Run & General Build Performance Improvements
Instant Run and general build speed are now faster with two new features: incremental Java compilation and in-process dex.
In previous versions of Android Studio, a single line of Java code change will cause all the Java sources in the module to be recompiled. Now in Android Studio 2.1, incremental Java compilation is enabled by default to reduce compilation time by compiling only what is needed.
We are also speeding up build times by using in-process dex, which converts class files to dex files within the Gradle daemon process. This avoids the costly processing operation of creating separate dex processes. To use this feature, you will need to increase the amount of memory available to the Gradle daemon to at least 2GB (1 GB is the default). This feature will help speed up both incremental and full builds.
We’d appreciate your feedback as we continue to improve Instant Run and general build performance. We are going to keep working on making build times even faster in coming releases. Click here to learn even more about the build changes.
What's Next
Update
If you are using a previous version of Android Studio, you can check for updates on the Stable channel from the navigation menu (Help → Check for Update [Windows/Linux] , Android Studio → Check for Updates [OS X]). If you need a new copy of Android Studio, you can download it here.
Test and Validate Apps with N Developer Preview
After you update to or download Android Studio 2.1 and you want to test and develop your apps with the N Developer Preview, create a fresh Android Virtual Device (AVD) for the new Android emulator, and check out these additional setup instructions.
We appreciate any feedback on things you like, issues or features you would like to see. Connect with us -- the Android Studio development team -- on our Google+ page or on Twitter.
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