sensor-fusion-demo/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
        maven { url 'http://repo1.maven.org/maven2' }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.3'
    }
}

allprojects {
    repositories {
        jcenter()
        maven { url 'http://repo1.maven.org/maven2' }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}