Option 1- From Studio
In Android Studio, go to File > Project Structure. Then select the "project" tab on the left.
Your Gradle version will be displayed here.
Option 2- gradle-wrapper.properties
If you are using the Gradle wrapper, then your project will have a gradle/wrapper/gradle-wrapper.properties folder.
This file should contain a line like this:
distributionUrl=https://services.gradle.org/distributions/gradle-2.2.1-all.zip
This determines which version of Gradle you are using. In this case, gradle-2.2.1-all.zip means I am using Gradle 2.2.1.
Option 3- Local Gradle distribution
If you are using a version of Gradle installed on your system instead of the wrapper, you can run gradle --version to check.
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