[MattStone]

Code:

private ArrayList<File> getFolders(File folder) {
		ArrayList<File> listAr = new ArrayList<File>();
		File[] list = folder.listFiles();

                // puts all the items from the array in an arraylist
		for (int i = 0; i < list.length; i++)  {
			if (listAr.add(list[i]).isDirectory()) 
                              listAr.add(list[i]);
                }
                return listAr;
       }

listAr.add(list[i]).isDirectory()
----Cannot invoke isDirectory() on the primitive type boolean