Do I have to declare "R" to use it in Android Studio?

Question

I am not sure why this line is wrong below. The "R" is being underlined in red.

View view = LayoutInflater.from(mContext).inflate(android.support.v4.R.layout.user_item, viewGroup, false);

Error:

Cannot resolve symbol 'R'

Is this the correct version or do I have to change something? Thanks!

score 0 · Answer 1 · answered Jun 25 '20 at 14:28

0

Try rebuilding the project and cleaning it. That usually fixes it. Also try syncing project with Gradle files. It's the little elephant at the top right.

answered Jun 25 '20 at 14:28

Madhu Sharma

562
4
9

It still isn't working. It says Cannot resolve symbol 'R' – Laura Smith Jun 25 '20 at 14:35
https://stackoverflow.com/questions/17054000/cannot-resolve-symbol-r-in-android-studio Look at this – Madhu Sharma Jun 25 '20 at 14:55
Thanks, I will look into this – Laura Smith Jun 25 '20 at 15:24

Lukas Konwitschny · Answer 2 · 2020-06-25T14:42:25.423

0

If you defined the user_item layout yourself, you should just use R instead of android.support.v4.R.

edited Jun 25 '20 at 14:42

answered Jun 25 '20 at 14:39

Lukas Konwitschny

26
4

I did that but R is still in the red. – Laura Smith Jun 25 '20 at 14:42
Do you only have the problem in that particular spot ? I guess youre using some other resources as well. – Lukas Konwitschny Jun 25 '20 at 14:44
Yeah, it's only in this spot – Laura Smith Jun 25 '20 at 15:11

score 0 · Accepted Answer · answered Jun 25 '20 at 16:19

write it as usual R.layout.user_item then place the cursor on red color R and press ALT+Enter this list will appear, click on import it will do the job.

and if it does not work then go to the project folder

delete these two Gradle files.

Click on this sync project with Gradle

Do I have to declare "R" to use it in Android Studio?

3 Answers3