It seems that most Android devices, even if they support slow motion recording with their native camera app, do not expose these settings via the official API.
On newer Samsung phones, you can enable a slow-motion preview via CameraParameter e.g. for 60Hz
parms.set("fast-fps-mode", 1);
parms.setPreviewFpsRange(60000, 60000);
How to enable slow-motion (high camera-preview) using the Android SDK?
Best, Fred