React Native Android Library SDK Versions

build.gradle

subprojects {
    ext {
        compileSdk = 25
        buildTools = "25.0.1"
        minSdk = 19
        targetSdk = 25
    }

    afterEvaluate { project ->
        if (!project.name.equalsIgnoreCase("app")
                && project.hasProperty("android")) {
            android {
                compileSdkVersion compileSdk
                buildToolsVersion buildTools
                defaultConfig {
                  minSdkVersion minSdk
                  targetSdkVersion targetSdk
                }
            }
        }
    }
}

If you're using gradle 3.1.0 which might be needed to work around some other bugs, then update compileSdk to 27 and possibly also increase targetSdk

I added the code block from that gist at the end of android/build.gradle so the topmost or "root" build.gradle for the android version of the app.

This worked in my case:

    compileSdk = 27
    buildTools = "27.0.3"
    minSdk = 16
    targetSdk = 26

I had a dependency set for sdk 16, so had to set minSdk to 16 to avoid one warning about that.