Android :: Adapter Filtering Via GetView Still Leaves Gray Lines

My application uses a list of media files on the phone, i.e. images, audio and video. It also allows the user to filter the list via some checkboxes in a menu, so the user can choose to show or hide each type of files. The way I've been doing this is by putting this in the adapter's getView():

// don't show unwanted file types if (cmo.hasType(MediaType.AUDIO_FILE)){
if(!prefs.getBoolean(PREFS_SHOWAUDIO, true)){ return new ViewStub(mContext);;
} }else if(cmo.hasType(MediaType.IMAGE_FILE)){ if(!prefs.getBoolean(PREFS_SHOWIMG, true)){
return new ViewStub(mContext);;
} }else if( cmo.hasType(MediaType.VIDEO_FILE)){ if(!prefs.getBoolean(PREFS_SHOWVIDEO, true)){ return new ViewStub(mContext);; } }

Which is quite effective in the sense that the list doesn't show those elements. However, the ListView still renders a 1px grey line between each View, even if they are ViewStubs, meaning I see a thick gray line whenever a group of consecutive items are filtered away. How can I get rid of those lines? Should I create a new data array, containing only the elements that should show a view?