static File maxFile(File dir) {
		File temp = null;

		if (dir.listFiles() != null)
			for (File f : dir.listFiles()) {

				if (f.isDirectory()) {
					File mt = maxFile(f);
					if (mt != null)
						temp = (temp == null) ? mt : (temp.length() > mt
								.length()) ? temp : mt;
				}

				if (f.isFile())
					temp = (temp == null) ? f
							: (temp.length() > f.length()) ? temp : f;

			}
		return temp;
	}