Handheld spray device

The design consists of the features of configuration, shape, ornamentation and pattern of the HANDHELD SPRAY DEVICE shown in solid lines in the drawings. The portions in stippled lines do not form part of the design. FIG. 1 is a front isometric view of a handheld spray device; FIG. 2 is a rear isometric view thereof; FIG. 3 is a front elevation view thereof; FIG. 4 is a rear elevation view thereof; FIG. 5 is a right side elevation view thereof; FIG. 6 is a left side elevation view thereof; FIG. 7 is a top plan view thereof; and FIG. 8 is a bottom plan view thereof.