android cannot resolve symbol R

Question

when i add or update a dependency in app gradle class R will not find in my activity class.

 "android cannot resolve symbol R"

That means you have some errors while building the project. Find and fix them — Vucko, Oct 22 '18 at 11:35
Terminal -> `gradlew clean build`. That'll show any errors in your build process. — Michael Dodd, Oct 22 '18 at 11:44
Check your package name that file, sometime it occurs due to package mismatch. If package is ok, then re-starting a project may help. — Neck, Oct 22 '18 at 11:45

score 2 · Answer 1 · answered Oct 22 '18 at 11:35

2

Top yellow bar has a function "Sync now". You can click it and it will sync the Gradle files.

If this doesn't work you can try

Build > Clean Project

Build > Rebuild Project

You can also try

File > Sync Project with Gradle Files

answered Oct 22 '18 at 11:35

Beasteca

1

In a case like this question please close the question against the canonical duplicate. – jww Oct 22 '18 at 13:26

score 0 · Answer 2 · answered Oct 22 '18 at 12:32

0

I had this this issue too. A simple 'gradlew clean' and 'gradlew build' did the trick.

Click on Build->Clean Project and that will perform a gradle clean

answered Oct 22 '18 at 12:32

VIISHRUT MAVANII

1

In a case like this question please close the question against the canonical duplicate. – jww Oct 22 '18 at 13:26

2 Answers2