'cannot resolve symbol R' in Android Studio

Question

I just finished my app, and when I try to save it as an APK, this error appears, all the 'R's in the code turned red. This is not the first time it happens. How do I fix it?

This are all the line with errors in the code, all the R. are in red.:

setContentView(R.layout.dise);
final EditText e=(EditText)findViewById(R.id.escribiraqui);
TextView T=(TextView)findViewById(R.id.traduccion);
Button TRAD=(Button) findViewById(R.id.traducir);
getMenuInflater().inflate(R.menu.java, menu);
if (id == R.id.action_settings) {

I tried importing android.R, and now the R isn't red anymore, now the error is after the R.id... or R.layout... or R.menu... All my variables are in red now, with the same error:

"cannot resolve symbol 'dise'", etc.

3.I just did alt+Enter on the R, then clicked on Create a class 'R'... The error disappeared, is this correct or it could lead to another error?

What is the error msg EXACTLY? Show us some minimal code that shows your problem. — amit, Jun 10 '14 at 17:02
check if you have errors in resource files fix it. Remove `import android.R` and cleand and build your project. — Raghunandan, Jun 10 '14 at 17:03
I checked all the files, everything is fine, the only problem is in the Main_Activity(Which named just as 'java' is the start while creating the project)... — user3726747, Jun 10 '14 at 17:25

score 2 · Answer 1 · answered Jun 10 '14 at 17:51

2

the R gets red when there is a problem generating this file. This can e.g. happen when you have mistakes in your grade-files. I would suggest to open a console in the path of your project and type:

gradle clean build

this should show you the root-cause - and if this works out fine then the red should be gone ( you might have to sync )

answered Jun 10 '14 at 17:51

ligi

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Thanks, but I don't know how to do that(Open the console). – user3726747 Jun 10 '14 at 18:01
@user3726747 Instead of doing the console, in Android Studio go to `Build->Clean Project` – Andrew Schuster Jun 10 '14 at 18:20
@Andrew Schuster , I did that, and nothing happen. – user3726747 Jun 11 '14 at 11:39
on which OS are you on? – ligi Jun 11 '14 at 11:40

score 1 · Answer 2 · edited May 23 '17 at 11:54

do not fiddle with any code , this "R getting red" issue is very common(and all is to do with gradle), I had it a lot in the past but with new gradle and sdk it is much less nowadays, but for anyone has the same issue do as follow hope it will work for you too,

This worked for me:

Close and reopen project
Press " Sync Project with Gradle file " (is next to AVD manager icon in top menu)

repeat 1-2 if Gradle could not Sync for first time. (mine worked in second time).

source, https://stackoverflow.com/a/31127514/4173238

score 0 · Answer 3 · answered Oct 21 '16 at 16:00

0

You can rebuild the project by going to build -> rebuild. If that doesn't work, make sure that the names of all assets are lowercase. That really got me, because it prevents the rebuild.

answered Oct 21 '16 at 16:00

score 0 · Answer 4 · edited Dec 01 '16 at 04:04

0

This seems to be a problem for Gradle settings, check your Gradle configuration in the build.gradle file Also make sure to go to

Preferences-> Build,Execution and Deployment -> Gradle -> use gradle default wrapper

Then, Clean and Rebuild your project

edited Dec 01 '16 at 04:04

Sachith Muhandiram

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answered Dec 01 '16 at 02:26

Dina Mansour

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score 0 · Answer 5 · edited Apr 03 '19 at 08:16

0

Just update your Gradle version

dependencies {
    classpath 'com.android.tools.build:gradle:3.1.2'  
}

edited Apr 03 '19 at 08:16

JustSomeGuy

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answered Apr 03 '19 at 07:41

Rachit Mishra

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Some cryptic letters · Answer 6 · 2023-01-23T12:56:03.313

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Make sure you added the package name in the Android Manifest file

Step 1: <manifest ... package="your.package.name"> ..... ..... ..... </manifest>

Step 2: Make sure you have the same sdk version in [build.gradle::app]

compileSdkVersion 30

buildToolsVersion '30.0.3'

edited Jan 23 '23 at 12:56

answered Jan 23 '23 at 12:51

Some cryptic letters

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'cannot resolve symbol R' in Android Studio

6 Answers6