四月 2011

[转]Android Market排名算法及规则

众所周知,做搜索出身的Google,旗下的Market的排名肯定是依据一个形同( A×a% + B×b% + C×c%)的公式计算出来的数值,进行排名的。开发者可根据其排名规则,对自己的产品设计和研发以及推广进行指导。

1. 排名公式里有哪些指标?

指标A、B、C到底是什么?权重a、b、c究竟是多少?这些问题的答案,应该是每个App开发者和运营者都渴望了解的。知道了这个答案之后,有些“聪明”的人就会像当年SP的从业者一样,去刷那些权重大的指标、从而拉升产品的排名了。网上关于此问题的讨论很多都是不了了之、无疾而终。相对较深入的一篇文章《Android Market App Rankings》,也只是在猜想是基于“安装量”的增长和留存。可惜,该作者离正确答案就差一步了…… 继续阅读…

Your debugger is not using the correct symbols

今个用WinDBG研究IDT时突然出现!idt命令提示Your debugger is not using the correct symbols,不知何故,试了一些网上提到的解决方法,都不太好使,结果发现只要简单的.reload一下就可以了,真是莫名其妙。

关于短信SMS的class

最近在研究GSM通信模块相关的AT指令时,发现短信部分经常提到个短信的class,不知为何,搜了一下,特此记录:

What are the classes of SM-MT (mobile terminated) messages?

Classes identify the message’s importance as well as the location where it should be stored. There are 4 message classes.
Class 0: Indicates that this message is to be displayed on the MS immediately and a message delivery report is to be sent back to the SC. The message does not have to be saved in the MS or on the SIM card (unless selected to do so by the mobile user).
Class 1: Indicates that this message is to be stored in the MS memory or the SIM card (depending on memory availability).
Class 2: This message class is Phase 2 specific and carries SIM card data. The SIM card data must be successfully transferred prior to sending acknowledgement to the SC. An error message will be sent to the SC if this transmission is not possible.
Class 3: Indicates that this message will be forwarded from the receiving entity to an external device. The delivery acknowledgement will be sent to the SC regardless of whether or not the message was forwarded to the external device.