react-native-webview/example/android/build.gradle

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

buildscript {
    ext {
        kotlinVersion = '1.3.10'
        buildToolsVersion = "28.0.3"
        minSdkVersion = 19
        compileSdkVersion = 28
        targetSdkVersion = 28
        supportLibVersion = "28.0.0"
        detoxKotlinVersion = kotlinVersion
    }
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
    }
}

allprojects {
    repositories {
        mavenLocal()
        google()
        jcenter()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../../node_modules/react-native/android"
            }
        maven {
            // Android JSC is installed from npm
            url "$rootDir/../../node_modules/jsc-android/dist"
        }
        maven { url "$rootDir/../../node_modules/detox/Detox-android" }
    }
}