Android Studio 3.6.1 with Gradle Plugin Version 3.6.1 and Gradle Version 5.6.4 not working

I have tried many ways to solve this problem as follow:

1st solution: I have tried the solution of Mayur Sojitra and it worked for one day. (Next day I got the same problem again.)

2nd solution: I have tried to revert back with a lower version of Gradle that is 3.5.0 and It's working but I wanted to use the latest version only. (Way to find a new solution)

3rd solution: I am using firebase dependencies and I thought that error is coming because of Firebase version conflicts with Gradle so I have updated all the firebase repository. (May this is also working for you)

4th solution: I have used ObjectBox library so updated that version to the latest 2.5.1.

5th solution: Finally I caught the problem that My Internet Connection is restricted (as per company rules) and My Gradle and other dependencies are not downloading successfully so I thought updating all dependencies and download it successfully will be the solution for this weird question.

Do let me know If you have any questions or still get a problem.

Thank you.

buildToolsVersion "29.0.2"

remove this line from build.gradle

It seems like you're mixing old fabric&crashlytics with new firebase&crashlytics. Try:

Project Level build.gradle:

buildscript {
    ext.objectboxVersion = '2.5.0'
    repositories {
        google()
        jcenter()
//        maven {
//            url 'https://maven.fabric.io/public'
//        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.1'
        classpath 'com.google.gms:google-services:4.3.3'

        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.2.1"
        classpath "io.objectbox:objectbox-gradle-plugin:$objectboxVersion"
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files

        // Add dependency
//        classpath 'io.fabric.tools:gradle:1.31.0'
        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.1.0'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

App Level build.gradle:

apply plugin: 'com.android.application'
apply plugin: "androidx.navigation.safeargs"
//apply plugin: 'io.fabric'
apply plugin: 'com.google.firebase.crashlytics'

android {
    compileSdkVersion 29
//    buildToolsVersion "29.0.2"    // buildtools is now automatically determined, based on compileSDKVersion
    defaultConfig {
        applicationId "com.sohamerp.marsremedies"
        minSdkVersion 19
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables.useSupportLibrary = true
        multiDexEnabled true
    }
    dataBinding {
        enabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility = 1.8
        targetCompatibility = 1.8
    }
}

dependencies {
    //implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.navigation:navigation-fragment:2.2.1'
    implementation 'androidx.navigation:navigation-ui:2.2.1'

    implementation 'androidx.multidex:multidex:2.0.1'

    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.android.material:material:1.2.0-alpha05'

    implementation 'com.github.mukeshsolanki:android-otpview-pinview:2.1.0'

    implementation 'com.squareup.retrofit2:retrofit:2.7.1'
    implementation 'com.squareup.retrofit2:converter-gson:2.7.1'
    implementation 'com.squareup.okhttp3:logging-interceptor:4.4.0'

    implementation 'com.google.android.gms:play-services-location:17.0.0'
    implementation 'com.google.firebase:firebase-core:17.2.2'
    implementation 'com.google.firebase:firebase-auth:19.2.0'
    implementation 'com.google.firebase:firebase-messaging:20.1.0'
//    implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'
    implementation 'com.google.firebase:firebase-crashlytics:17.0.0'

    implementation 'com.github.bumptech.glide:glide:4.11.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
    annotationProcessor 'androidx.annotation:annotation:1.1.0'

    implementation "com.github.firdausmaulan:GlideSlider:1.5.1"

    implementation 'com.theartofdev.edmodo:android-image-cropper:2.8.0'

    implementation 'org.greenrobot:eventbus:3.1.1'

    debugImplementation "io.objectbox:objectbox-android-objectbrowser:$objectboxVersion"
    releaseImplementation "io.objectbox:objectbox-android:$objectboxVersion"

    implementation 'com.intuit.sdp:sdp-android:1.0.6'
}
// apply the plugin after the dependencies block

apply plugin: 'com.google.gms.google-services'
apply plugin: 'io.objectbox'

If you're still looking at this, I just got an update to 3.6.2 and it specifically did some firebase-related update (although my code doesn't use firebase..) immediately after restart.

I ran into the same error. However, I succeeded in building in the following way.

- classpath 'com.google.firebase:firebase-plugins:1.1.1'
+ classpath 'com.google.firebase:firebase-plugins:1.2.0'

Possible solution:

Upgrade the version of plugins in Top-level build.gradle.

Detail:

I upgraded the Gradle version from 5.4.1 to 5.6.4, and the plugin version from 3.5.3 to 3.6.2, and then I encountered a problem that the class could not find.

I have used Realm in the project and the top-level build.gradle is:

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    /.../
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.2'
        classpath "io.realm:realm-gradle-plugin:5.8.0"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

This problem seems like some library/plugin does not process R classes in R.jar but in R.java after the Gradle plugin version greater than 3.6.0. See here for detail.

And the solution is to upgrade Realm to a newer version, for me is 6.0.2. See here for detail.

    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.2'
        classpath "io.realm:realm-gradle-plugin:6.0.2" // <- modify
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }

gradle 5.6.4 having some sync problem . go to the gradle-wrapper.properties and change the url to this

distributionUrl=https://services.gradle.org/distributions/gradle-6.0-all.zip

I tried many suggestions from stackoverflow(here), github forums etc. Checked gradle and gradle plugin versions if there is any compatibility problems. Only worked : I clean .idea and .gradle file, exit AndroidS, and I open my react native proj on Android studio and I did open from file choose android folder, after that waited android studio finish indexing(really waited this time) and press hammer icon for build and wait again patiently and build-run on simulator successfully.

I didn't wait before, I guess I didn't imagine that Android studio takes so much time to index-run-build

I am sharing if somebody still stuck, key was waiting for me, good luck