Shitter-android-app/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:3.0.0"
    }
}

allprojects {
    repositories {
        jcenter()
        google()
    }
}