Android Studio Java Syntax Highlighting Not Working

Question

In Android Studio (Version 1.1.0) I'm having issues getting it to highlight .java syntax properly. It is currently only highlighting Keywords, commas, semicolons, and comments. Other file types such as .xml are highlighted properly.

I've tried the following things...

1. Reinstalling Android Studio Removing any personal settings
2. In Settings -> Editor Changed the colors to anything to see if it worked, under General and Java
3. File -> Invalidate Caches
4. Under File Types I've declared my file as a Java source file.
5. Made sure Power Save Mode was turned OFF.

Saturable

Is the file located in a source root? – Romney

Yup! It is located in root. I'll take a look at the link. Thanks. – Saturable

That was indeed the issue, I've submitted my answer. Thanks makoto! – Saturable

i have changed my kotlin-gradle-plugin version from 1.5.21 to 1.5.20 in classpath of build.gradle of app and its working fine. – Diffidence

Answer 1

The .java file was located in the root directory. I moved the file to the directory src/main/java/org.we/ and the syntax started working.

Saturable

I'm having the same issue with Android Studio 2.2.3, but I don't exactly understand the answer you submitted. Where should the Java source files be located relative to the source root for the syntax highlighting to work? Right now my files are right in the source root directory, and nothing works. – Lindbom

same. need a slightly more detailed answer – Chenille

Answer 2

You should do invalidate caches and restart. It will work.

Lenni

Nope, didn't help. This started happening after I updated to Flamingo. – Ovum

@MarkusK It works with Giraffe. try to update the newer version – Shortcut

It also worked for me on Giraffe version – Apennines

Answer 3

I ran into this problem today. In my case it was caused by Android Studio changing my "MainActivity.java" file from a Class to a Singleton. If the file is a Class its icon in the editor or project listing will have a "c" in a light blue circle. If it is a Singleton it has a "j" in a grey rectangle. To resolve it I did the following:

1. copied the file's contents into notepad
2. deleted the singleton file BUT I did not select "safe delete" since I don't want Android Studio to do anything clever
3. created a new Java Class file with the same name as the original file
4. replaced the contents of the new file with what I put into notepad in step 1

Then everything started working again.

Before this I'd tried the invalidation/restart and disabling power save mode but they did not work for me. I even tried rebooting my computer several times.

Oppose

You saved my day! I just tried that and everything just started working again! – Phagy

This helped me, I think that Android Studio (InteliJ IDEA?) get confused by changing a kotlin interface into an abstract class?! – Highclass

Answer 4

To solve this kind of issue, I had to trigger: File -> Repair IDE

Moxie

This worked for me on Koala feature drop 8. The re-index project step was the one that resolved the issue. – Canaster

Having this issue w/ Koala 2024.1.1 and have tried everything (including Repair IDE steps) and it keeps coming back on certain files. No clue what to do.....AHA!!! I found I had disabled the JetPack Compose plugin so I re-enabled that. I also disabled then re-enabled all plugins and restarted Android Studio. This is what worked for me. – Iconolatry

Answer 5

To quickly refresh or enable syntax highlighting, I accidentally did: Ctrl + Alt + S to go to settings, then in Plugins -> Installed disable any plugin and then Enable it and Apply.

This worked for me.

Marginate

Answer 6

None of these worked on the 2024 version. I had to uninstall Android Studio, clear all caches and application support on Mac, and reinstall it again to solve this issue.

Cassandra

Answer 7

１. Remove cache

(in my case it happened on macOS)

rm -rf ~/.gradle/cache/*

２. Execute the following steps

1. open the target file on Android Studio
2. ctrl + a
3. ctrl + x
4. ctrl + s
5. ctrl + v

３. Restart Android Studio

It works for me.

Derrickderriey

Answer 8

i had the same problem and tried almost anything i could. Then i realized i had a folder named "app", after moving "src" folder out of app the problem was fixed.

after moving the folders

Hephaestus

Answer 9

My issue were two new Grazie plugins I enabled. Disabling them solved the problem

Cathleencathlene

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Answer 10

Deleting the Android Studio app and then re-downloading it worked for me.

Quintanilla

Answer 11

Please remove and reinstall Android Studio. I had installed multiple versions of Android Studio, and it was my problem. I deleted all of these and installed the new version (Koala); everything is fine now( on mac )!

Macedo