文件大小转换

public static String setSize(int size) {
    int MB = 1024 * 1024;
    int KB = 1024;
    String resultSize;
    DecimalFormat df = new DecimalFormat("0.00");
    if (size / MB >= 1) resultSize = df.format(size / (float) MB) + "MB";
    else if (size / KB >= 1) resultSize = df.format(size / (float) KB) + "KB";
    else resultSize = size + "B";
    return resultSize;
}