If you haven’t heard already Android Studio is jumping to version number 2.0. Instant Run is here!
Finally we will be able to decrees our iteration times, developers behind as are claiming that this feature will “dramatically reduce” time spent watching that indeterminate progress bar. Update is already available in canary channel, if you are going to use project created in earlier versions remember to enable Instant Run(setting is located under deployment section).
Read more here.
Hint: If you want to reduce your iteration time even further use genymotion instead device/emulator.