Unresolved reference: BR (Android Studio)

Question

My top level build.gradle:

buildscript {     ext.kotlin_version = '1.2.41'     ext.lifecycle_version = "1.1.1"     repositories {         google()         jcenter()     }     dependencies {         classpath 'com.android.tools.build:gradle:3.1.3'         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"     } } 

My project level build.gradle:

android {     ...     dataBinding {         enabled = true     } }  dependencies {     ...     implementation fileTree(dir: 'libs', include: ['*.jar'])     implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"     implementation "android.arch.lifecycle:extensions:$lifecycle_version" } 

I also added android.databinding.enableV2=true to gradle.properties per Google documents (https://developer.android.com/topic/libraries/data-binding/start)

When I try to run, it shows Unresolved reference: BR error in my BaseViewHolder class. It seems that BR class has been properly generated but it also says duplicate class found in the file .../R.java when I mouse over the class name. What have I done wrong?

fun bind(obj: Any) {         binding.setVariable(BR.obj, obj)         binding.executePendingBindings() } 

Answer 1

For Android Studio 3.3, Gradle 3.3.0 and Databinding v2, the only line that needs to be added to fix this issue is in your (app's or modules) build.gradle:

apply plugin: "kotlin-kapt" 

Answer 2

Android Studio failed to import my BR class automatically. All solutions provided above failed. I just had to import the class manually, Android studio had created it correctly.

SAMPLE:

package your_packagename  import your_packagename.BR import ... ...  

I think this happened due to Copy and Paste. When i typed BR manually, Android Stdio did the Automatic Import.