New kotlin files in old java project - 'Unresolved reference' R

Question

Have an already existing java project. Trying to add new kotlin files to it. AndroidStudio 3.1 complains that R is an "Unresolved reference".

I can manually import R and it builds without error. But why is R not automatically imported as always?

Edit- clean&build or restarting AS didnot help.

Thanks for the suggestions @StefanGolubović. But clean->build or restarting AS didnot help. — anoo_radha, Mar 29 '18 at 16:59

score 1 · Answer 1 · answered Mar 29 '18 at 17:03

1

See imports inside kotlin file. Package names might be from your old project, that won't allow you to use R. Delete them, and reimport

answered Mar 29 '18 at 17:03

Jack

No package name changes though. other imports are good. Just R is not imported at all. – anoo_radha Mar 29 '18 at 17:09
do you copy paste, or import via ide? – Jack Mar 29 '18 at 17:12
Does R get automatically imported for you on AS 3.1 and kotlin? – anoo_radha Mar 29 '18 at 17:16
please explain how u import kotlin files? I just copy paste and correct the imports, when needed – Jack Mar 29 '18 at 17:58
I import with autoimport functionality – anoo_radha Mar 29 '18 at 18:04
check for errors inside files. AS won't build until therent any, and until you have a successful build R isnt avialible – Jack Mar 29 '18 at 18:11
1

i can import R manually and still successfully build. My question was why doesn't it import R automatically like it does for other imports. Thanks for your help – anoo_radha Mar 29 '18 at 18:24

score 1 · Answer 2 · edited Jan 31 '20 at 06:32

1

I found a solution. Just import your main package R in your kotlin file where you got this error.

Like:

import com.example.activities.R

edited Jan 31 '20 at 06:32

4b0

answered Jan 31 '20 at 06:30

vinod

score 0 · Accepted Answer · answered Apr 01 '18 at 11:12

0

In AS Preferences, under General -> Auto Import, i enabled the following.

This imports R automatically now.

answered Apr 01 '18 at 11:12

anoo_radha

Where is that option in Android Studio?. – glisu Nov 08 '18 at 01:15
@glisu See Preferences -> Editor -> General > Auto Import -> Java – Mario Huizinga Dec 11 '18 at 12:16

3 Answers3