How to change Project language level on Android Studio

Question

I would like to install the version of Java that I use in Android Studio.

How to set "Project language level", as I do in Intellij inside "Project structure ..." → "Project"?

Answer 1

You can also edit this inside the project structure.

Answer 2

An example build.gradle file that allows me to use lambdas in Android Studio 2.1:

android {
compileSdkVersion 23
buildToolsVersion "23.0.2"

defaultConfig {
    applicationId "com.geniuscreations.successtaskanalyzer"
    minSdkVersion 17
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
    jackOptions {
        enabled true
    }
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}
}

Java 8 Features | Android Developers