What is a step size in a RatingBar? This is what I found in the documentation: The step size of this rating bar. For example, if half-star granularity is wanted, this would
Its nothing but a factor by which you increase ratings on RatingBar. If you want ratings to be displayed like 3.5 or 4.5, you can use stepSize as 0.5. Incase, you want ratings like 3.1 or 4.3, you can have stepSize like 0.1.
Inshort,
stepSize = 1, Ratings = 0, 1, 2, 3, 4, 5, ...
stepSize = 0.1, Ratings = 0.0, 0.1, 0.2, ..., 1.0, ..., 2.0, ..., 5.0, ...
stepSize = 0.5, Ratings = 0.0, 0.5, 1.0, 1.5, 2.0, ..., 5.0, ...