Dat053 — How to setup annotation processor on Android with Kotlin

Some library uses the annotation processor to annotate code to be changed in compile time. Here is how to set it up in an Android project that uses Kotlin.

1. add apply plugin: ‘kotlin-kapt’ to app’s build.gradle
2. change annotationProcessor to kapt

For example:

Dagger 2

Java version:

dependencies {
   implementation 'com.google.dagger:dagger:2.18'
   annotationProcessor 'com.google.dagger:dagger-compiler:2.18'
}

Kotlin version:

apply plugin: 'kotlin-kapt'
dependencies {
   implementation 'com.google.dagger:dagger:2.18'
   annotationProcessor 'com.google.dagger:dagger-compiler:2.18'
}

Example project:

jacky-ttt/CodingEveryday

Same goes to

AutoValue

api "com.google.auto.value:auto-value-annotations:1.6.2"
kapt "com.google.auto.value:auto-value:1.6.2"

ButterKnife

implementation 'com.jakewharton:butterknife:9.0.0-rc1'
kapt 'com.jakewharton:butterknife-compiler:9.0.0-rc1'