ecency-mobile/android/build.gradle

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

def getNpmVersion() {
    def inputFile = new File(projectDir.getPath() + "/../package.json")
    def packageJson = new JsonSlurper().parseText(inputFile.text)
    return packageJson["version"]
}

def getNpmVersionArray() { // major [0], minor [1], patch [2]
    def (major, minor, patch) = getNpmVersion().tokenize('.')
    return [Integer.parseInt(major), Integer.parseInt(minor), Integer.parseInt(patch)] as int[]
}

buildscript {
    ext {
        buildToolsVersion = "27.0.3"
        minSdkVersion = 16
        compileSdkVersion = 27
        targetSdkVersion = 26
        supportLibVersion = "27.1.1"
    }
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'
        // Add this line
        classpath 'com.google.gms:google-services:4.0.2'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        mavenLocal()
        google()
        jcenter()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
        maven { url 'https://maven.google.com' }
        maven { url "https://jitpack.io" }
        maven {
            // Local Maven repo containing AARs with JSC library built for Android
            url "$rootDir/../node_modules/jsc-android/dist"
        }
    }
}

subprojects {project ->
    if (project.name.contains('react-native-fast-image')|| project.name.contains('realm')) {
            buildscript {
                repositories {
                maven { url "https://dl.bintray.com/android/android-tools/"  }
            }    
        }
    }
    ext {
        def npmVersion = getNpmVersionArray()
        versionMajor = npmVersion[0]
        versionMinor = npmVersion[1]
        versionPatch = npmVersion[2]
    }
}


task wrapper(type: Wrapper) {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}