How to set max line length in Android Studio code editor?

How can I set a maximum length for Android Studio's code editor, or may be set a word wrap?

In my Android Studio, no matter how long a statement I type on a single line, it never automatically goes to the next line, but rather a horizontal scroll bar appears.

When I autoformat using the Ctrl+Alt+L (reference), nothing happens.

My SO or Google search found a lot of material on this for Eclipse, but not for Android Studio.

If you need not a soft wrap,
but actually, brake one long line onto several lines you need:

Go to Preferences(mac) or Settings(windows) -> Editor -> Code style -> Java/Kotlin -> Wrapping and braces (tab) -> Check "Ensure that right margin is not exceeded"

Now try to reformat your code:
press OPTION (ALT) + CMD + L on your Mac (or CTRL + ALT + L on PC)

Edit 13.02.19

As noted in comments this option seems not available in settings for Kotlin. However, there is a workaround to manually add it.
Here is what it takes to make it work:

1. Export the settings scheme.

2. Open saved xml file.

3. Find <codeStyleSettings language="kotlin"> tag (or create)

4. Add the WRAP_LONG_LINES setting manually:

   <codeStyleSettings language="kotlin">
      ...
      <option name="WRAP_LONG_LINES" value="true" />
   </codeStyleSettings>
   

5. Save edits and and import back the scheme.

6. Here you go!

MacOS:

1. Click on Android Studio ( left top corner )
2. Click Preferences
3. Type Code Style in search
4. Click on Code Style
5. There is a filed right to the 'Hard wrap at' - you can enter needed about of symbols you need

In File | Settings, select "Editor", then "Code Style". There is an option "Wrap when typing reaches right margin".

Edit: Just tried it, and it doesn't seem to work. Anyway, maybe the option "Use soft wrap" in the "General" group is more what you want.

@Solace, actually @Fahim Faysal's answer is quite close to what you need, but since you want to solve the problem no matter how long a statement I type on a single line, it never automatically goes to the next line, 2 more steps you need to follow:
[Step 9] type the max length you prefer at `"Hard wrap at" ()
[Step 10] change "Wrap on typing" from Default: No or No to Yes

In Android Studio: File->Setting-> Editor->code Style->java->Wrapping and braces(tab:right side)->keep when reformatting->Line break(make unchecked)

With version 4.1.2 and with Dart language you need to go to "File/Settings/Editor/Code Style/Dart" and modify the "Line length" to the preferred number.

You can change the max column width from: File > Settings > Editor > Code Style > Right Margin (columns)

Android Studio 3.5:

Mac - Android Studio > Preferences > Editor > CodeStyle > HardWrap at: ____

My Environment：

• Ubuntu 18.04
• AndroidStudio 3.3.2

My operate：

• File -> Settings -> Editor -> Code Style
  1. Scheme -> select Project
  2. Hard wrap at '120'
  3. Apply

The existing answers already answer the question in straight forward way. As a different approach you could set the style guide to kotlin style guide code style. Then if you do alt + ctrl + l as you did, you'll see auto wrap as you expected.

1. Just open the settings, search for kotlin and look for kotlin under code style.

2. On the top right hand side of the settings window you'll see Set from..., click on it.

3. Then on predifined style > kotlin style guide

If you'd like to follow the kotlin formatting style this could reduce more effort. For more information: https://developer.android.com/kotlin/style-guide

To move the grey vertical line, that tells Android Studio where to wrap your code, go to

Settings- Editor- Code Style- Java or Kotlin- Wrapping and Braces- Hard wrap at

and enter the number of characters, where the line should be.

In settings/code style/kotlin/wrapping and braces replace the "do not wrap" values with "wrap if long"

You can change the Hard wrap at param