Could not Resolve Symbol R After Migrating to Androidx

Question

After migrating to Androidx,my project start displaying a red underline error which says could not resolve R.

i have Tried googling for some similar issue but yet the error remain,
i have checked my manifest, my Res folder for error
i have novalidate/restart project
i have clean and rebuild project
i have sync gradle with android project

yet after i have done these, the error still remains

dependencies {
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.recyclerview:recyclerview:1.0.0'
//    implementation 'com.google.android.material:material:1.0.0-rc01'
    implementation 'com.google.android.material:material:1.1.0-alpha05'
    implementation 'androidx.multidex:multidex:2.0.1'
    implementation 'androidx.appcompat:appcompat:1.0.2'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'


    implementation 'com.github.maxyou:CalendarPicker:v1.1.2'

//    Ramotion
    implementation 'com.ramotion.paperonboarding:paper-onboarding:1.1.3'
    implementation 'com.ramotion.foldingcell:folding-cell:1.2.3'
    implementation 'com.ramotion.garlandview:garland-view:0.3.3'
}

MyApplication.java

package xyz.esusku.nearbyworker;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}```

i have even create a new project and yet the problem remains — Zionnite, Apr 03 '19 at 08:53
One (or more) of your layouts still reference the older AppCompat dependencies in xml. That is why the R file generation is failing. — farhanjk, Apr 03 '19 at 08:55
@Zionnite what IDE version do you use? Try the latest one for IntelliJ IDEA and RC for AS. — CrazyCoder, Apr 03 '19 at 09:00
Look for obvious stuff like `android.support.design.widget.BottomNavigationView` has changed to `com.google.android.material.bottomnavigation.BottomNavigationView`. Any fully qualified name in your layout. — farhanjk, Apr 03 '19 at 09:04
@CrazyCoder, am downloading a newer version of Intellij IDEA now — Zionnite, Apr 03 '19 at 09:09
@farhanjk, it just a new project, i only have just one xml file which is the one created by the IDE Wiszard and search through there is only one element which is the The TextView — Zionnite, Apr 03 '19 at 09:15
Hmmm, well it was worth checking as I have faced the issue before. Sorry my friend, let's wait for smarter people to solve this one. — farhanjk, Apr 03 '19 at 09:20
Can you include your Android Studio version and grad;e version in the question? — MD Naseem Ashraf, Apr 03 '19 at 14:58
@MDNaseemAshraf, follow this link [link](https://stackoverflow.com/questions/34353220/android-studio-please-select-android-sdk) — Zionnite, Apr 03 '19 at 22:04

score 4 · Accepted Answer · answered Apr 03 '19 at 09:19

See https://twitter.com/tasomaniac/status/1103020923874131968 for the details.

Gradle Android Plugin 3.3+ no longer generates R source file. You either need to update to the IDE that supports the new binary format for the resources or downgrade the plug-in to an older version in your build.gradle.

score 1 · Answer 2 · answered Apr 03 '19 at 09:03

1

Hope you have added these line in gradle.properties file: as you are trying to migrate existing project.

android.useAndroidX=true
android.enableJetifier=true

one more thing try removing the duplicate import-

import android.support.v7.app.AppCompatActivity; //remove this line
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;

answered Apr 03 '19 at 09:03

Sujeet Kumar

256
1
11

i have done that exactly but yet the error still persist – Zionnite Apr 03 '19 at 09:08
i tried `import android.R` it work by eliminating the error but it does not open layout folder – Zionnite Apr 03 '19 at 09:22

Could not Resolve Symbol R After Migrating to Androidx

2 Answers2