Android Kotlin : Error Unresolved reference: DaggerAppComponent

Question

I have installed Kotlin plugin today into an existing project with Dagger 2. Before Kotlin was installed I had no issues with Dagger. However, now the compiler complains :

Answer 1

At first, It gives an error after rebuild:

Unresolved reference: DaggerAppComponent

You should try to import (Alt + Enter) that component.

Answer 2

I was getting the same error message, but my case was different than yours. The unresolved reference appeared only when generating signed APK. This is how I solved it:

app/build.gradle

kapt {
    generateStubs = true
}

dependencies {
    //...
    implementation 'com.google.dagger:dagger:2.9'
    kapt 'com.google.dagger:dagger-compiler:2.9'
}

I can now deploy my signed APK without errors

Answer 3

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'   

And in your dependencies:

implementation "com.google.dagger:dagger:2.x"
implementation "com.google.dagger:dagger-android:2.x"
implementation "com.google.dagger:dagger-android-support:2.x"
kapt "com.google.dagger:dagger-compiler:2.x"
kapt "com.google.dagger:dagger-android-processor:2.x"

Answer 4

Do not use private for inject dagger in Kotlin, use it like this for Kotlin

@Inject
     internal lateinit