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问题:

I'm using Android Studio 3.2 Beta5 to migrate my project to AndroidX. When I rebuild my app I got these errors:

ERROR: [TAG] Failed to resolve variable '${animal.sniffer.version}'

ERROR: [TAG] Failed to resolve variable '${junit.version}'

Full clean & rebuild did not work! Anyone know how to fix this? Please help me.

gradle.properties

android.enableJetifier=true
android.useAndroidX=true

build.gradle

buildscript {
    repositories {
        google()
        jcenter()
        mavenCentral()
        maven { url 'https://maven.fabric.io/public' }
        maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0-beta05'

        classpath 'com.google.gms:google-services:4.0.1'
        classpath "io.realm:realm-gradle-plugin:5.3.1"
        classpath 'io.fabric.tools:gradle:1.25.4'
        classpath 'com.google.firebase:firebase-plugins:1.1.5'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()
        maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
    }
}

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

app/build.gradle

apply plugin: 'com.android.application'
apply plugin: 'realm-android'
apply plugin: 'io.fabric'
apply plugin: 'com.google.firebase.firebase-perf'

android {
    compileSdkVersion 28
    buildToolsVersion "28.0.0"
    defaultConfig {
        applicationId "com.iceteaviet.fastfoodfinder"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        multiDexEnabled true
    }

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

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    testImplementation 'junit:junit:4.12'

    implementation 'com.jakewharton:butterknife:9.0.0-SNAPSHOT'

    implementation 'androidx.appcompat:appcompat:1.0.0-rc01'
    implementation 'com.google.android.material:material:1.0.0-rc01'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0-rc01'
    implementation 'androidx.cardview:cardview:1.0.0-rc01'

    implementation 'com.google.maps.android:android-maps-utils:0.5'
    implementation 'com.google.android.gms:play-services-maps:15.0.1'
    implementation 'com.google.android.gms:play-services-location:15.0.1'
    implementation 'com.google.firebase:firebase-core:16.0.1'
    implementation 'com.google.firebase:firebase-database:16.0.1'
    implementation 'com.google.firebase:firebase-auth:16.0.1'
    implementation 'com.google.android.gms:play-services-auth:15.0.1'

    implementation 'com.github.bumptech.glide:glide:4.7.1'

    implementation 'com.google.code.gson:gson:2.8.5'
    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0'

    implementation 'org.greenrobot:eventbus:3.1.1'

    implementation 'de.hdodenhof:circleimageview:2.2.0'

    implementation 'io.realm:realm-android-library:5.3.1'

    implementation 'com.facebook.android:facebook-android-sdk:4.34.0'

    implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
    implementation 'io.reactivex.rxjava2:rxjava:2.0.2'

    implementation 'androidx.multidex:multidex:2.0.0'

    implementation 'com.crashlytics.sdk.android:crashlytics:2.9.4'
    implementation 'com.google.firebase:firebase-perf:16.0.0'

    implementation 'com.jakewharton.timber:timber:4.7.1'

    annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-SNAPSHOT'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.7.1'
}

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

回答1:

I fix this with two steps

1) File -> Invalidate Caches / restart...

2) Build -> Clean project

回答2:

It seems to be Glide the problem.

I had the same error and I just updated the Glide's dependencies to 4.8 and there is no build errors.

Kotlin :

// Glide
def glide_version = "4.8.0"
implementation "com.github.bumptech.glide:glide:$glide_version"
kapt "com.github.bumptech.glide:compiler:$glide_version"

Java :

// Glide
def glide_version = "4.8.0"
implementation "com.github.bumptech.glide:glide:$glide_version"
annotationProcessor "com.github.bumptech.glide:compiler:$glide_version"

Be sure to have enabled in your gradle.properties :

android.useAndroidX=true
android.enableJetifier=true

Source : https://github.com/bumptech/glide/issues/3124

Hope this will help you!

回答3:

Adding Java 8 support to build.gradle file fixed issue for me

android {
     ...

     //Add the following configuration in order to target Java 8.
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
}

回答4:

Try removing this line:

maven { url "https://oss.sonatype.org/content/repositories/snapshots" }

from the buildscript / repositories section of your build.gradle file.

When I added that line, I got the error you described. When I removed it, no longer. That line should only be in the allprojects / repositories section.

回答5:

I got the same error after updating my build.gradle file with AndroidX Test dependencies. Turns out I forgot to remove the old junit dependency. So for me, the fix was simply to remove the following dependency:

dependencies {
    ...
    testImplementation 'junit:junit:4.12'
}

回答6:

Try set android.enableJetifier=false in gradle.properties. Then Invalidate Caches / Restart ... in Android Studio

回答7:

The fix is in 4.2.0, use the higher version of google gms jar.

Try changing:

classpath 'com.google.gms:google-services:4.0.1'

by this version:

classpath 'com.google.gms:google-services:4.2.0'

Hope this works...

回答8:

I fixed this by updating the firebase dependencies to the latest.

回答9:

If you're using Kotlin, the issue will popup if don't use the kapt version for any annotation processor you use in the project.
As @Vince mentioned the case with Glide, this could happen with Dagger2, Butterknife, etc.
If you're using both Java and Kotlin you'll need to keep both dependencies, as follows (were $glideVersion is a predefined version of Glide):

implementation "com.github.bumptech.glide:glide:$glideVersion"
annotationProcessor "com.github.bumptech.glide:compiler:$glideVersion"
kapt "com.github.bumptech.glide:compiler:$glideVersion"

If you're on a Kotlin only project, the kapt dependency should work alone.

EDIT
Another thing you should have in mind is if you're already using Androidx. Androidx is a great refactor but when migrating it can cause some of your dependencies to collapse. Mainstream libraries are already updated to Androidx, however, some of them are not and even won't.
If the issue doesn't go away with my provided solution above this edit, you can take a look at your dependencies and make sure they use Androidx as well.