We first need to load the model from our resources into the memory. For this, we require logic that fetches the file, parses it, and produces the output, which we can use in the following step of rendering an orientation of the model. To load the model, we can either write the logic for it ourselves or use an existing library. The latter approach is generally preferred, unless you have special needs that are not yet covered by an existing library.
As we have no such special needs, we will use an existing library. Our choice here is the open Asset Import Library, or assimp for short. It can import numerous 3D model files in addition to other kinds of resource files, which we'll find useful later on. Assimp is written in C++, which means that we will be using it as a native library (.a or .so). To accomplish this, we first need to obtain its source code and compile it for Android.
The main Assimp site can be found at http://assimp.sf.net/, and the Git repository is...