Develop Reference

Android Studio XML code is folding my code automatically

i'm have a small problem with my android studio IDE, i've made some changes but don't remember exactly where i did made this change in the settings, the problem is that my xml code is always folded, and i want to know how i can change it to be unfolded by default as it should be.

Preferences > Editor > General > Code Folding > XML > XML tags: disable

For Android Studio 4.0 or above
Goto Settings or Press (Ctrl + Alt + S)
And Navigate to Editor = > Code Folding
And uncheck the option XML tags

Android Studio 2.2 by default doesn't show the line number

How do I modify the default settings to show the line number in AS 2.2?

Android Studio > Editor > General > Appearance: There will be a "show line number" checkbox for Mac

There's an easiest way...
Right clic in the left side bar of the Workspace area and choose Show Line Numbers (see pic example).
Enjoy coding!

Why is Android Studio scrolling code editor to last cursor position?

When I open a Java file in Android Studio, the code editor automatically jumps to the last position my cursor was at when I closed the file. Is there a way to disable this 'feature'? I just simply want to go to the top of the file when I open a file...

It's Alt + Ctrl + Right/Left arrow.
You can change these shortcuts under:
File > Settings > Appearance & Behavior > Keymap > Main menu > Navigate > Back/Forward.

Android Studio, change the editor background color (not the whole theme)

The same question was marked as "duplicate" even though it obviously was not a duplicate. At least it should be obvious to anyone who is familiar with configuring an editor. When you want to change the background color, you aren't talking about changing the whole theme, you are talking about changing the background color.
Is there a way to change only the background color in Android Studio editor?

Sorry, but I believe you all have this one wrong. To change the background of the editor goto File, Settings, Editor, Colors & Fonts and select General. You'll see an item called "Default text". On the right of the window you will see a checkbox for background. Click in the color window and choose whichever color you prefer. Now the entire editor window will show that color as the background.

go to : Android Studio > Preferences > Editor > Colors & Fonts > General

In Android Studio 3.2.1 Windows (latest version as of today - Nov 2, 2018), go to
File > Settings > Editor > Color scheme > General > Text-Default text. One can change foreground and background colors using the panel on the right.
One can change the bottom logcat panel colors similarly - go to
File > Settings > Editor > Color Scheme > Console Colors > Console (or log Console)

Yes it is. Open Settings (Preferences on a Mac) and under IDE Settings expand Editor, Colors & Fonts and select General. You'll see Background in a menu on the left side. Click on the checkbox next to it if it's not ticked already and then double click on the square filled with current background color to get the color picker.

AndroidStudio 3.3.2
1st step:
2nd step:

Android Studio 4.1.2 on Mac
File -> Preferences -> Editor -> Color Scheme -> General -> Text -> Default Text

None of the Answers above have correct info for Windows Android Studio 3.1.2.
On Mac, apparently this works: go to Android Studio > Preferences > Editor > Colors & Fonts > General, but we Windows folk don't have an Android Studio tab or option and Preferences isn't an option anywhere.
We have File > Settings > Editor. Here's the screen with the only conceivable next links to click highlighted:
But here's what I see when I click General. I can select this background:
But I can't live with that.
In Windows 7, AS 3.1.2 the menu sequence--File > Settings > Editor > Color scheme > General > Text > Default text--takes you to a screen where you can set the foreground and background colors via a "color circle" or by typing in your favorite RRGGBB code(s).
I was pleasantly surprised by how an error in an xml file showed up (and the current line):

How to turn off the dotted line between lines in Eclipse?

I just downloaded the ADT from google which included the Juno version of Eclipse.
After making a project however, the default text editor has this horrible dashed / dotted line between every horizontal line. It's a pain to look at, but Eclipse's appearance preferences always leaves me completely lost.
Any ideas on how to turn off?
Screenshot :
or link
http://imgur.com/BcOe9tV

I had the same dotted lines after choosing a darker color scheme in Eclipse and this fixed it:
Window/Preferences/General/Appearance/Jeeeyul's Themes/Edit/Underline Style: None

You probably enabled "Show Whitespace Characters" by mistake.
Is this what you're asking to turn it off?
If so, just click at this button:

Install Jeeeyul theme
Goto General > Appearance > Jeeeyul theme
Select Editor tab and set Underline Style to None, as shown in the screenshot:

These dots represent white-spaces between words/lines.
You can turn them on/off by going to Preference > General > Editors > Text Editors > Show Whitespace Characters
I found this option in Eclipse Luna. Juno should also have similar option.
Edit:
Alternatively, as #Leandro suggested, there is a button in the toolbar to turn it on/off