Cannot resolve symbol 'R' in a module

Question

I'm finally migrating from Eclipse to Android Studio and can't even connect a little module.

Here's the only file in resources - as you can see by a screenshot, there is no error there

But in the class where it is needed 'R' is not resolved. So I'm confused - there is not too much to look into

There are problems in App's module as I didn't hook all the libraries yet, but no obvious problem in 'dragsortlib' module. I cleaned, rebuilt project but this didn't help.

manifest :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mobeta.android.dslv"
    android:versionCode="4"
    android:versionName="0.6.1">
    <uses-sdk android:targetSdkVersion="7"
        android:minSdkVersion="7" />
</manifest>

gradle :

apply plugin: 'com.android.library'

android {
    compileSdkVersion 25
    buildToolsVersion "24.0.2"

    defaultConfig {
        minSdkVersion 9
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.0.0'
    compile files('libs/android-support-v4.jar')
    testCompile 'junit:junit:4.12'
}

@VladMatvienko alt+Enter doesn't give me this option to import it — Vlad Alexeev, Nov 11 '16 at 09:05
You can try to build your project without using that resources in your JAVA files firstly. I suspect some mistakes in XML files, that don't show up before build. — Vladyslav Matviienko, Nov 11 '16 at 09:10
You are not compiling the project you added. You have to add it in dependencies like this . `compile project(':dragsortlib').` — Sunil Sunny, Nov 11 '16 at 10:08

score 2 · Answer 1 · edited May 23 '17 at 12:30

2

Click on Build -> Rebuild Project and then click Tools -> Android -> Sync Project with Gradle Files.

You may refer here

edited May 23 '17 at 12:30

Community

1
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answered Nov 11 '16 at 08:56

AI.

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score 1 · Answer 2 · answered Nov 11 '16 at 09:33

1

First check the import of R file
Delete build folder under app manually and Build project again.
Check your xml files. R.java is not generated if you have errors in your xml file.
Lastly update your build tools.

answered Nov 11 '16 at 09:33

Rajesh Gosemath

1,812
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17
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score 0 · Answer 3 · answered Jan 30 '19 at 07:43

I would like to make clear that this Error occurs while there is any issue in your res folder and it is not allowing to auto generate resource id in R.Java file. So look it carefully in your resource folder and manifest what causes this error.

It would be a little mistake causing this error, Once you find that mistake you can easily resolve this error, But most of the case you need to Clean Project or Invalidate Cache and Restart will work after resolving issue.

Hope this will work.

Cannot resolve symbol 'R' in a module

3 Answers3