The ornamental design for a portablemediaplayer, as shown and described.
FIG. 1 is a bottom rear perspective view of a portable media player showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines immediately adjacent to the claimed areas in the views represent the boundaries of the claimed design. The broken lines showing of control buttons and fastening members are for illustrative purpose only. None of the broken lines form part of the claimed design.