//通用的手机流量计算方法 private String byteToMB(long size){        long kb = 1024;        long mb = kb*1024;        long gb = mb*1024;        if (size >= gb){            return String.format("%.1f GB",(float)size/gb);        }else if (size >= mb){            float f = (float) size/mb;            return String.format(f > 100 ?"%.0f MB":"%.1f MB",f);        }else if (size > kb){            float f = (float) size / kb;            return String.format(f>100?"%.0f KB":"%.1f KB",f);        }else {            return String.format("%d B",size);        }    }