How do you set APP_PLATFORM in Gradle NDK plug-in in Android Studio?

Question

I'm building an app with an NDK library using Android Studio 1.5.1 and the Gradle experimental plugin 0.4.0.

Even though the Gradle config is set as such (with minSdkVersion.apiLevel = 18), it seems like the NDK library is still compiled for android-21:

compileOptions.with {
    sourceCompatibility=JavaVersion.VERSION_1_7
    targetCompatibility=JavaVersion.VERSION_1_7
}

android {
    compileSdkVersion = 23
    buildToolsVersion = "23.0.2"

    defaultConfig.with {
        applicationId = "net.pol_online.hyper"
        minSdkVersion.apiLevel = 18  // Android 4.3 Jelly Bean
        targetSdkVersion.apiLevel = 23  // Android 6.0 Marshmallow
    }
}

Is it because APP_PLATFORM is not automatically set by the Gradle NDK support based on the min SDK version? If so how do you fix this?

Answer 1

You can set this:

android.ndk {
   platformVersion = "19"
}

See https://stackoverflow.com/a/33982735/3115956 for details on this. (In practice, I think your library is built targeting android-23, which has the same effect as targeting android-21 - compileSdkVersion is the one that affects it (for both the java and native code, unless the native one is overridden).