How to target android sdk version 28 in order to put an app on the play store?

I got a simpler solution.
Install Android Studio.
On Processing do File->Export Android project.
On Android Studio import the “Android Project”( import project ).
On Grable (Grable Script/ build.grable(Module)) put the api to 28 ( compileSdkVersion and targetSdkVersion ) and the dependencies to ‘com.android.support:appcompat-v7:28.0.0’ and ‘com.android.support:design:28.0.0’.
Then do Build->Generate Signed APK.

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