private String formatFileSize(long length) { String result = null; int sub_string = 0; if (length >= 1073741824) { sub_string = String.valueOf((float) length / 1073741824).indexOf( "."); result = ((float) length / 1073741824 + "000").substring(0, sub_string + 3) + "GB"; } else if (length >= 1048576) { sub_string = String.valueOf((float) length / 1048576).indexOf("."); result = ((float) length / 1048576 + "000").substring(0, sub_string + 3) + "MB"; } else if (length >= 1024) { sub_string = String.valueOf((float) length / 1024).indexOf("."); result = ((float) length / 1024 + "000").substring(0, sub_string + 3) + "KB"; } else if (length < 1024) result = Long.toString(length) + "B"; return result; }