Now's a good time to add the Cardboard SDK library
.aar files to your project. For the basic projects in this book the libraries you need (at the time of writing v0.7) are:
Note the SDK includes additional libraries that we do not use in the projects in this book but could be useful for your projects. The
audio.aar file is for spatialized audio support. The
videowidget libraries are meant for 2D apps that want to drop-into VR for things such as viewing a 360-degree image or video.
At the time of writing, to obtain the Cardboard Android SDK client libraries, you can clone the
cardboard-java GitHub repository, as explained on the Google Developers Cardboard Getting Started page,