Error:Program type already present: android.arch.lifecycle.LiveData

Question

When I press the run button in Android Studio, my app compiles but shows this error (redacted):

Error:Program type a         


        

Answer 1

This post is the top search result for the very similar error: "Program type already present: android.arch.lifecycle.ViewModelProvider$Factory"

My project uses Room and LiveData, but not firebase. The following changes removed the error:

FROM:

implementation 'android.arch.persistence.room:runtime:1.0.0'
annotationProcessor 'android.arch.persistence.room:compiler:1.0.0'
implementation 'android.arch.lifecycle:extensions:1.0.0'
annotationProcessor 'android.arch.lifecycle:compiler:1.0.0'

TO:

implementation 'android.arch.persistence.room:runtime:1.1.1'
annotationProcessor 'android.arch.persistence.room:compiler:1.1.1'
implementation 'android.arch.lifecycle:extensions:1.1.1'
annotationProcessor 'android.arch.lifecycle:compiler:1.1.1'

--- UPDATED ANSWER ---

My previous answer was aimed at solving this error. However, I thought it would be worth presenting it again using best practises:

App level build.gradle file:

// Room components
implementation "android.arch.persistence.room:runtime:$rootProject.roomVersion"
annotationProcessor "android.arch.persistence.room:compiler:$rootProject.roomVersion"
androidTestImplementation "android.arch.persistence.room:testing:$rootProject.roomVersion"

// Lifecycle components
implementation "android.arch.lifecycle:extensions:$rootProject.archLifecycleVersion"
annotationProcessor "android.arch.lifecycle:compiler:$rootProject.archLifecycleVersion"

Project level build.gradle file:

ext {
   roomVersion = '1.1.1'
   archLifecycleVersion = '1.1.1'
}

Reference:
https://codelabs.developers.google.com/codelabs/android-room-with-a-view/#2