November 6, 2019 update:

There's a new open source Cardboard SDK that offers a streamlined API, improved device compatibility, and built-in viewer profile QR code scanning. We recommend that all developers actively building for Google Cardboard migrate to the new Cardboard SDK: iOS, Android NDK, Unity XR Plugin (SDK)

October 15, 2019 update:

The Daydream View VR headset is no longer available for purchase. However, you can continue to use the existing Google VR SDK to update and distribute your apps to the Google Play Store, and make them available to users in the Daydream app.

Google VR Java API Overview

There are four packages in the Google VR Java API, three as part of the SDK and one as part of the NDK.

com.google.vr.ndk.base
com.google.vr.sdk.base Code for the core Google VR API.
com.google.vr.sdk.audio Code for 3D-spatialized sound.
com.google.vr.sdk.controller Code for using the Daydream controller with your VR app.

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Last updated 2019-02-21 UTC.