Value of compileSdkVersion for Android P Developer Preview

Question

What should be the value of:

compileSdkVersion
targetSdkVersion

I have downloaded and installed Android P Developer Preview SDK, System image and build tools.

I have tried "28" but it is showing this error:

Answer 1

With the P preview:

compileSdkVersion 'android-P'

targetSdkVersion 'P'

See: https://developer.android.com/preview/setup-sdk.html

Answer 2

compileSdkVersion 'android-P'

and

targetSdkVersion 'P'