build.gradle

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

apply plugin: 'com.android.library'

android {
    compileSdkVersion safeExtGet('compileSdkVersion', 26)
    buildToolsVersion safeExtGet('buildToolsVersion', '25.0.3')

    defaultConfig {
        minSdkVersion safeExtGet('minSdkVersion', 19)
        targetSdkVersion safeExtGet('targetSdkVersion', 25)
    }
    lintOptions {
        abortOnError false
    }
}

repositories {
    mavenCentral()
}

dependencies {
    compileOnly('com.facebook.react:react-native:+') {
        exclude group: 'com.android.support'
    }
    implementation "com.github.barteksc:android-pdf-viewer:${safeExtGet("pdfViewer", "2.8.2")}"
}