Configuring JavaCC in Android Studio

Apply JavaCC plugin for Gradle.  The top-level build.gradle should look something like this:

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.0.0-alpha3'
        classpath 'ca.coglinc:javacc-gradle-plugin:2.3.1'  
    }
}

Apply the plug-in in the module's build.gradle file:

apply plugin: 'com.android.application'
apply plugin: 'ca.coglinc.javacc'

Make your Java compilation tasks depend on compileJavacc task and add Java files generated by Javacc to your source path:

android {
    // ...
    sourceSets {
        main {
            java.srcDir compileJavacc.outputDirectory
        }
    }
    applicationVariants.all { variant ->
        variant.javaCompile.dependsOn compileJavacc
    }
    // ...
}

When integrating into an Android library, replace applicationVariants with libraryVariants.

Finally, install JavaCC IntelliJ plug-in to enable syntax highlighting.