Example data

library(raster)
## Loading required package: sp
library(mapview)

r <- system.file("external/test.grd", package="raster")
r  <- raster(r)

Mapview 1

m <- mapview(r)
m

Mapview 2

m <- mapview(r)
m

Mapview 3

m <- mapview(r, layer.name = "change_name")
m