error: supertypes of the following classes cannot

问题:

I can't compile my Android Kotlin project.

I have no idea what is this...

Gradle log:

error: supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath: class android.support.v7.app.AppCompatActivity, unresolved supertypes: SupportParentable

build.gradle (app)

buildscript {
    ext.android_plugin_version = "2.3.3"
    ext.kotlin_version = '1.1.2-5'

    repositories {
        maven { url 'https://maven.google.com' }
        maven { url "https://jitpack.io" }

        mavenCentral()
    }

    dependencies {
        classpath "com.android.tools.build:gradle:$android_plugin_version"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        maven { url 'https://maven.google.com' }
        maven { url "https://jitpack.io" }

        mavenCentral()
    }
}

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

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'

def compat_version = '26.+'
def play_services_version = '11.0.1'
def firebase_version = '9.6.1'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"

    defaultConfig {
        applicationId "com.site.app"
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        javaCompileOptions {
            annotationProcessorOptions {
                arguments = ["library" : "true"]
            }
        }
    }

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

    dexOptions {
        javaMaxHeapSize "4g"
    }

    dataBinding {
        enabled true
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}

kapt {
    generateStubs = true
    correctErrorTypes = true
}

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

    // android
    compile 'com.android.support:multidex:1.0.1'
    compile "com.android.support:appcompat-v7:${compat_version}"
    compile "com.android.support:design:${compat_version}"
    compile "com.android.support:cardview-v7:${compat_version}"
    compile "com.android.support:recyclerview-v7:${compat_version}"
    compile "com.android.support:gridlayout-v7:${compat_version}"
    compile "com.google.android.gms:play-services:${play_services_version}"
    compile "com.google.android.gms:play-services-ads:${play_services_version}"
    compile "com.google.android.gms:play-services-maps:${play_services_version}"
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.google.maps.android:android-maps-utils:0.4+'
    kapt "com.android.databinding:compiler:$android_plugin_version"

    // kotlin
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
    testCompile "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
    testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
}

回答1:

In my case I had a library module with an abstract application class implementing Dagger's HasActivityInjector and an application module with a dependency to the library and its own (non-abstract) application class extending the base app class.

My Gradle dependencies were implementations, and therefore not accessible to the application module's application class (even though there were no imports there, otherwise the issue would be immediately obvious as you'd get a 'could not resolve' error. The fix was to replace dagger implementation dependencies with api, that makes them available to dependant modules as well.

回答2:

I fixed it by changing the order of plugins call!

build.gradle

buildscript {
    ext.android_plugin_version = '2.3.3'
    ext.kotlin_version = '1.1.3-2'

    repositories {
        jcenter()
        mavenCentral()

        maven { url "https://maven.google.com" }
        maven { url 'https://maven.fabric.io/public' }
        maven { url "https://jitpack.io" }
    }

    dependencies {
        classpath "com.android.tools.build:gradle:$android_plugin_version"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
        classpath 'io.fabric.tools:gradle:1.+'
    }
}

allprojects {
    repositories {
        jcenter()
        mavenCentral()

        maven { url "https://maven.google.com" }
        maven { url 'https://maven.fabric.io/public' }
        maven { url "https://jitpack.io" }
    }
}

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

app/build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'io.fabric'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"

    defaultConfig {
        applicationId "com.sample.app"
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }

    buildTypes {
        debug {
            ext.alwaysUpdateBuildId = false
        }

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

    dexOptions {
        javaMaxHeapSize "4g"
    }

    dataBinding {
        enabled true
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        abortOnError false
        disable 'InvalidPackage'
    }
}

kapt {
    generateStubs = true
}

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

    // kotlin
    kapt "com.android.databinding:compiler:$android_plugin_version"
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

    // android
    compile 'com.android.support:multidex:1.0.1'
    compile "com.android.support:appcompat-v7:${compat_version}"
    compile "com.android.support:design:${compat_version}"
    compile "com.android.support:cardview-v7:${compat_version}"
    compile "com.android.support:recyclerview-v7:${compat_version}"
    compile "com.android.support:gridlayout-v7:${compat_version}"
    compile "com.android.support:support-vector-drawable:${compat_version}"
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile "com.google.android.gms:play-services-ads:${play_services_version}"
    compile "com.google.android.gms:play-services-maps:${play_services_version}"
    compile "com.google.android.gms:play-services-gcm:${play_services_version}"
    compile 'com.google.maps.android:android-maps-utils:0.4+'

    // fabric
    compile('com.crashlytics.sdk.android:crashlytics:2.6.8@aar') {
        transitive = true;
    }

    // logger
    compile 'com.orhanobut:logger:2.1.1'

    // dexter
    compile 'com.karumi:dexter:4.1.0'

    // firebase
    compile "com.google.firebase:firebase-messaging:${firebase_version}"

    // persistence
    compile "android.arch.persistence.room:runtime:1.0.0-alpha3"
    annotationProcessor "android.arch.persistence.room:compiler:1.0.0-alpha3"

    // facebook
    compile 'com.facebook.android:facebook-android-sdk:4.+'

    // retrofit
    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'

    // gson
    compile 'com.google.code.gson:gson:2.8.1'

    // jobs
    compile 'com.evernote:android-job:1.1.11'

    // chart
    compile 'com.github.PhilJay:MPAndroidChart:v3.0.1'

    // fresco
    compile 'com.facebook.fresco:fresco:1.3.0'

    // indicator
    compile 'com.github.JakeWharton:ViewPagerIndicator:2.4.1'
}

回答3:

Before trying anything else, try: Android Studio -> File -> Invalidate cache/restart

This worked for me.

回答4:

For me the problem was child module not using AndroidX Activity. I guess the class names clashed.

Added this to resolve:

implementation 'androidx.legacy:legacy-support-v4:1.0.0'

回答5:

On my case I had to add the required dependency on my main module and compile the last version with:

android {
    configurations.all {
        resolutionStrategy.force "com.squareup.picasso:picasso:${picassoVersion}"
    }
}

回答6:

Update your google play gradle version to the latest

回答7:

I was getting error for below lib in app level build.gradle

  implementation 'com.google.firebase:firebase-iid:20.0.2'

So the solution is the order in project level build.gradle, So before solving error the structure was

buildscript {
ext.kotlin_version = '1.3.50'
repositories {

    google()
    jcenter()
    mavenCentral()
    maven {
        url "https://maven.google.com"
    }

}
dependencies {
    classpath 'com.android.tools.build:gradle:3.5.3'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath 'com.github.jengelman.gradle.plugins:shadow:1.2.3'
    classpath 'com.google.gms:google-services:4.3.3'
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {

    google()
    jcenter()
    mavenCentral()
    maven {
        url "https://maven.google.com" // Google's Maven repository
    }

}
}

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

After Solving the error the struture is :

buildscript {
ext.kotlin_version = '1.3.50'
repositories {
     maven {
        url "https://maven.google.com"
    }
    google()
    jcenter()
    mavenCentral()


}
dependencies {
    classpath 'com.android.tools.build:gradle:3.5.3'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath 'com.github.jengelman.gradle.plugins:shadow:1.2.3'
    classpath 'com.google.gms:google-services:4.3.3'
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {
    maven {
        url "https://maven.google.com" // Google's Maven repository
    }
    google()
    jcenter()
    mavenCentral()


}
}

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

By default it tries to download using google() as it comes first in the sequence but when we move maven on top of all then it creates the build again using maven and the build succeeds. Cheers :)

回答8:

When setting up the crashlytics to my app, I used "recommended" dependency as well, as shown below. But this was the part causes error.

// Firebase Crashlytics
// (Recommended) Add the Google Analytics dependency.
implementation 'com.google.firebase:firebase-analytics:17.2.1'
implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'

Removing "analytics" line solved my problem.

// Firebase Crashlytics
implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'

Hope this helps someone else too,

best