android 文件大小转换 B KB MB GB

/*** 转换文件大* @param fileSize 文件大小 字节* @return*/public static String formatFileSize(long fileSize) {DecimalFormat df = new DecimalFormat("#.00");String fileSizeString = "";String wrongSize = "0B";if (fileSize == 0) {return wrongSize;}if (fileSize < 1024) {fileSizeString = df.format((double) fileSize) + "B";} else if (fileSize < 1048576) {fileSizeString = df.format((double) fileSize / 1024) + "KB";} else if (fileSize < 1073741824) {fileSizeString = df.format((double) fileSize / 1048576) + "MB";} else {fileSizeString = df.format((double) fileSize / 1073741824) + "GB";}return fileSizeString;}