private void deleteMedia(final String advName) {
    File path = Environment.getExternalStorageDirectory();
    File directory = new File(path.getAbsolutePath() + "/your directory name");
    if (!directory.exists()) {
        directory.mkdir();
    }
    File[] files = directory.listFiles(new FilenameFilter() {
        @Override
        public boolean accept(File dir, String name) {
            return name.contains(advName);
        }
    });
    if (files != null) {
        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            file.delete();
        }
    }
}