为什么变量名通常以字母“m”开头?(复制)

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Why do most fields (class members) in Android tutorial start with `m`? 13 answers
为什么Android教程中的大多数字段(类成员)以“m”开头?13个答案

Looking at the Android tutorials such as the Notepad tutorial, I noticed that almost all variables are named starting with the letter 'm'. What convention is this, and where does it originate from?

看看记事本教程之类的Android教程，我注意到几乎所有的变量都是以字母“m”开头的。这是什么习俗?它从何而来?

8 个解决方案

#1

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It stands for member. I personally find this convention unhelpful, but it's subjective.

它所代表的成员。我个人觉得这个惯例没有用，但它是主观的。

#2

See Code Style Guidelines for Contributors: Follow Field Naming Conventions. The use of the "m" prefix is more specific that simply denoting a "member" variable: It's for "non-public, non-static field names."

参见代码样式指南:遵循字段命名约定。使用“m”前缀更具体地表示一个“成员”变量:它表示“非公共的、非静态字段名”。

#3

According to Android source code documentation:

根据Android源代码文档:

Non-public, non-static field names start with m.
非公共、非静态字段名以m开头。
Static field names start with s.
静态字段名以s开头。
Other fields start with a lower case letter.
其他字段以小写字母开头。
Public static final fields (constants) are ALL_CAPS_WITH_UNDERSCORES.
公共静态最终字段(常量)是all_caps_with_下划线。

Note that this is for writing Android source code. For creating Android apps, the Google Java Style Guide may be more helpful.

注意，这是用于编写Android源代码的。对于创建Android应用程序，谷歌Java风格指南可能更有帮助。

#4

The m is here to indicate a member variable.

m表示一个成员变量。

It has 2 huge advantages:

它有两个巨大的优势:

If you see it, you instantly recognize it as a member variable.
如果您看到它，您立即将它识别为成员变量。
Press m and you get all members via the auto completer. (This one is not in the other answers)
按m，你通过自动完成器得到所有成员。(其他答案中没有这个)

#5

'm' means member of the class. So, if you don't use IDE to highlight your members, then you will understand that it is a member by it's name

m是这个班的成员。因此，如果您不使用IDE来突出显示成员，那么您将理解它是由其名称组成的成员

#6

As already answered this prefix indcates that a variable is member.

如前所述，这个前缀表示一个变量是成员。

Somtimes people use other prefixes if you discover some variables starting with 'i' or 's' it could also be a variant of the Hungarian Notation

有时候，如果你发现一些变量以“i”或“s”开头，人们会用其他前缀，这也可能是匈牙利符号的变体

#7

'm' means the variable is a member variable of the class...

“m”表示变量是类的成员变量。

#8

not only in java, I've seen similar convention in cocos2d+box2d samples where some of the variables start with m_, but others don't, very confusing.

不仅在java中，我还在cocos2d+box2d示例中看到了类似的约定，其中一些变量以m_开头，而另一些则不是，非常混乱。


b2World* world;
GLESDebugDraw *m_debugDraw;

I guess to differentiate C++ box2d variables from Obj-C variables.

我猜是为了区分c++ box2d变量和object -C变量。

#1

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