In principle you've answered your own question. Gravity inside a hollow sphere is always zero. More formally, the force exerted on any particle inside a hollow sphere, as a result of a uniform field that follows an inverse square law (gravity and electrostatic charge are two examples) is zero. This is the shell theorem.
Now the shell theorem applies to perfectly symmetrical hollow spheres. A hollow Earth need not be perfectly symmetrical. If the hollow Earth is oblate (like our own), or otherwise non-symmetrical (either on the outside or the inside), then the gravity field will not be uniform and not always zero everywhere. For this to be noticeable, though, the asymmetry would have to be rather large (unlike Earth's).
I have no idea how the math would work in that case, and also no idea whether that idea has ever been employed in fiction.