Google launched Android Studio version 2.0 of its integrated development environment (IDE) for developing applications for its mobile OS Android with instant run feature.
Android Studio, is based on IntelliJ, was launched in 2013 and came out of beta a year ago. It includes everything an android developer needs to build and deploy android app.
Deploying an Application on emulator is hectic for developers and its consumes lot of development time due to which developer has to use 3rd party emulators like Geny motion or physical device which make there deployment speed faster then native android emulators that were release with android sdk in past.
On November 23rd, 2015 at the Android Developer Summit, Google announced a preview of Android Studio 2.0 featuring Instant Run that will dramatically improve your development workflow by deploying app 2x or 2.5x faster then before. All these updates are available now in the canary release channel, You can download a preview version of android studio 2.0 from there.
How to Enable Instant Run in Android Studio 2.0
If you create a new project with Android Studio 2.0 then your projects are already setup no need to change any thing. If you have a pre-existing project then open Settings/Preferences, the go to Build, Execution, Deployment → Instant Run. Click on Enable Instant Run.
