Android--将字节数转化为B，KB，MB，GB的方法

//将字节数转化为MB
    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);
        }
    }