blocks|key|701426|text|尝试右键单击灰色条并选择显示行号它对我有效，所以希望它对你也有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|701427|​|701428|📷|atomic|offset|length|701429|701430|701431|701432|或在设置中更改它|701433|文件>设置>编辑器>外观，然后单击“显示行号”框。|701434|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/9f50b91c5364d9bb6041820d50eca472.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/debe3b8e278307e1d8bac8bbed641047.png^0|0|0|0|1|0|0|0|0|1|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@$G|13|H|14|1|15]]|A|$]]|$1|I|3|C|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|E|5|F|7|17|8|@]|9|@$G|18|H|19|1|1A]]|A|$]]|$1|K|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1C|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1D|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]|Y|$5|S|T|U|A|$V|Z|X|-4]]]]

try right clicking the grey bar and selecting show line numbers
it works for me so hopefully it will for u too

<img src="https://i.stack.imgur.com/DDx8O.png" alt="enter image description here"> 

<a href="https://i.stack.imgur.com/OdOza.png" rel="noreferrer"><img src="https://i.stack.imgur.com/OdOza.png" alt="enter image description here"></a>

or change it in the settings

File > Settings > Editor > Appearance then click the "Show line numbers" box.

blocks|key|701552|text|文件>设置>编辑器>外观，然后单击“显示行号”框。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|701553|​|701554|📷|atomic|offset|length|701555|701556|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/741feb41661157df0e5c131ffc342eae.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

File > Settings > Editor > Appearance then click the "Show line numbers" box.

<img src="https://i.stack.imgur.com/AIVGb.png" alt="enter image description here">

blocks|key|917701|text|在eclipse中:窗口>首选项>常规>编辑器>文本编辑器检查：“显示行号”在默认情况下不被选中。它同时适用于源代码和xml文件(至少在helios中)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|917702|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In eclipse: Windows > Preferences > General > Editors > Text Editors
check: "show line numbers"
It is not checked by default. It is for both source code and xml files (at least in helios)

blocks|key|917742|text|在OS+X上:+Android+Studio+(屏幕左上角)>首选项>编辑器>外观。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|917743|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

On OS X: Android Studio (top left of the screen) > Preferences > Editor > Appearance.

blocks|key|917902|text|我知道这是一个古老的问题，但我只是遇到了这个问题，所以我必须为自己找到一个解决方案。我假设菜单已经根据我正在阅读的前面的答案发生了一些变化。下面是如何在MAC上的Android+Studio1.5上做到这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|917903|您首先单击要查看数字的窗口“编辑器”，然后简单地从两个建议的解决方案中选择一个。|917904|最简单的方法是在owen-gerig显示的灰色条上单击鼠标右键，我认为这是最简单的，但如果你想通过菜单设置它，你可以通过查看->活动编辑器->显示行号。希望这能有所帮助。|offset|length|917905|​|917906|📷|atomic|917907|917908|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/530933/owen-gerig/|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/1c31693b3589bcedf6229c020e04d5b2.png|imageAlt^0|0|0|8|A|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@$F|14|G|15|1|16]]|A|$]]|$1|H|3|I|5|6|7|17|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|18|8|@]|9|@$F|19|G|1A|1|1B]]|A|$]]|$1|M|3|I|5|6|7|1C|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]|V|$5|W|R|X|A|$Y|Z|10|-4]]]]

I know this is an old question but I just came across the problem so I had to find a solution for my self. I assume the menu has changed a bit based on the previous answers that I am reading. So here is how to do it on Android Studio 1.5 on MAC.

You first click on the window "editor" that you want to see the numbers and then simply choose one of the two proposed solutions under. 

The easiest way is simply right click on the grey bar as <a href="https://stackoverflow.com/users/530933/owen-gerig/">owen-gerig</a> shows, which I think is the easiest, but if you want to set it through the menu you can via View -> Active Editor -> Show Line Numbers. Hope this helps.

<a href="https://i.stack.imgur.com/aVH3w.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aVH3w.png" alt="Line Numbering on Android Studio 1.5 for MAC"></a>

blocks|key|917990|text|要使行号始终显示在android+studio中，请按照以下步骤操作:文件>设置>编辑器>常规>外观，然后选中“显示行号”框，特别是如果您使用的是AS+2.1.1。下面的图片是...How+to+show+line+numbers+in+Android+Studio+2.1.1|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|917991|entityMap|0|LINK|mutability|MUTABLE|url|http://i.stack.imgur.com/t5eAe.png^0|2J|1C|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

To make the line numbers show always in your android studio, follow this, go to:
File > Settings > Editor > General > Appearance and then check the "Show line numbers" box especially if you are using AS 2.1.1. Picture here below...<a href="http://i.stack.imgur.com/t5eAe.png" rel="nofollow">How to show line numbers in Android Studio 2.1.1</a>

When editing XML files in the editor for Eclipse, line numbers are not displayed.

Use case:

I create a layout with many views, one of these lacks android:layout_width attribute. This causes a runtime error when the binary XML layout resource is inflated. The error log tells me to check like 361 in my XML file. 

Thanks to the line number being displayed I can find the offending line and make the change without having to open the file in another editor.

No line numbers in Eclipse or Android Studio XML editor

Android Studio

Android

Eclipse

在Eclipse编辑器中编辑XML文件时，不显示行号。使用案例：我创建了一个有很多视图的布局，其中一个缺少android:layout_width属性。当二进制XML布局资源膨胀时，这会导致运行时错误。错误日志告诉我在我的XML文件中检查361。多亏了显示的行号，我可以找到有问题的行并进行更改，而不必在另一个编辑器中打开文件。

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