build.gradle

apply plugin: 'com.android.library'

def safeExtGet(prop, fallback) {
    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
}

android {
    compileSdkVersion safeExtGet('compileSdkVersion', 23)
    buildToolsVersion safeExtGet('buildToolsVersion', '23.0.3')

    defaultConfig {
        minSdkVersion safeExtGet('minSdkVersion', 16)
        targetSdkVersion safeExtGet('targetSdkVersion', 23)
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:${safeExtGet("supportLibVersion", "23.4.0")}'
    compile 'com.facebook.react:react-native:+'
}