kotlinx.android.synthetic unused android studio issue

Question

I am working one project using kotlin + Rxjava + MVVM. During development facing issue of importing view ids in Fragment or viewholder.

import kotlinx.android.synthetic.main.layout.* unused with kotlin.

Normaly view id should used from kotlin synthetic layout imports but it directly import it from R.id that should not happen.

Kotlin plugin version : org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.40

My gradle file :

apply plugin: 'com.android.feature' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' apply plugin: 'idea' apply plugin: 'kotlin-kapt'  android {     compileSdkVersion 27     baseFeature true     defaultConfig {         minSdkVersion 23         targetSdkVersion 27         versionCode 1         versionName "1.0"     }     buildTypes {         release {             minifyEnabled false             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'         }     }       lintOptions {         abortOnError false     } }  dependencies {      api "com.android.support:design:$rootProject.support_library_version"     api "com.android.support:appcompat-v7:$rootProject.support_library_version"     api "com.android.support:recyclerview-v7:$rootProject.support_library_version"     api "com.android.support:support-dynamic-animation:$rootProject.support_library_version"     api "com.android.support:cardview-v7:$rootProject.support_library_version"     api "com.android.support:customtabs:$rootProject.support_library_version"      api "com.android.support.constraint:constraint-layout:1.1.0-beta5"     api 'android.arch.lifecycle:extensions:1.1.0'       api 'androidx.core:core-ktx:0.2'       api "com.google.dagger:dagger:$rootProject.dagger_version"     kapt "com.google.dagger:dagger-compiler:$rootProject.dagger_version"      api "android.arch.persistence.room:runtime:$rootProject.room_version"     kapt "android.arch.persistence.room:compiler:$rootProject.room_version"     testImplementation "android.arch.persistence.room:testing:$rootProject.room_version"     api "android.arch.persistence.room:rxjava2:$rootProject.room_version"     androidTestImplementation "android.arch.core:core-testing:$rootProject.room_version"     testImplementation "android.arch.core:core-testing:$rootProject.room_version"      api "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"     api "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"       api 'com.jakewharton.timber:timber:4.5.1'      api "com.android.support:multidex:1.0.3"      api "com.github.bumptech.glide:glide:$rootProject.glide_version"     api "jp.wasabeef:glide-transformations:$rootProject.glide_transformation_version"     api 'com.github.bumptech.glide:okhttp3-integration:1.5.0@aar'      api "io.reactivex.rxjava2:rxandroid:$rootProject.rxAndroid_version"     api "io.reactivex.rxjava2:rxjava:$rootProject.rxJava_version"     api "com.google.code.gson:gson:$rootProject.gson_version"      api("com.squareup.retrofit2:retrofit:$rootProject.retrofit_version") {         // exclude Retrofit’s OkHttp peer-dependency module and define your own module import         exclude module: 'okhttp'     }      api "com.squareup.okhttp3:okhttp:$rootProject.okhttp_version"     api "com.squareup.okhttp3:logging-interceptor:$rootProject.okhttp_version"     api "com.squareup.retrofit2:adapter-rxjava2:$rootProject.retrofit_version"     api "com.squareup.retrofit2:converter-gson:$rootProject.retrofit_version"      api 'com.jakewharton.threetenabp:threetenabp:1.0.5'      api "com.google.firebase:firebase-invites:$rootProject.play_services_version"     api "com.google.firebase:firebase-core:$rootProject.play_services_version"     api "com.google.firebase:firebase-config:$rootProject.play_services_version"     api "com.google.firebase:firebase-perf:$rootProject.play_services_version"     api "com.google.firebase:firebase-auth:$rootProject.play_services_version"     api "com.google.firebase:firebase-firestore:$rootProject.play_services_version"        api("com.firebaseui:firebase-ui-auth:$rootProject.firebase_ui_version") {         // exclude Retrofit’s OkHttp peer-dependency module and define your own module import         exclude module: 'play-services-auth'         exclude module: 'firebase-auth'     }      // Required only if Facebook login support is required     api('com.facebook.android:facebook-android-sdk:4.31.0')      api "com.google.android.gms:play-services-auth:$rootProject.play_services_version"      // Required only if Twitter login support is required     api("com.twitter.sdk.android:twitter-core:3.0.0@aar") { transitive = true }      api 'com.jakewharton.rxbinding2:rxbinding-kotlin:2.0.0'     api 'com.jakewharton.rxbinding2:rxbinding-support-v4-kotlin:2.0.0'     api 'com.jakewharton.rxbinding2:rxbinding-appcompat-v7-kotlin:2.0.0'     api 'com.jakewharton.rxbinding2:rxbinding-design-kotlin:2.0.0'      api('com.crashlytics.sdk.android:crashlytics:2.9.1@aar') {         transitive = true     } } 

I have also tried clean build and Rebuild project.

Any idea how can i resolve this issue ?

Answer 1

I have tried several approaches including the solutions reported in this thread. I also found out that a lot of folks are facing this annoying problem as you can see here

Nevertheless, the most closest solution to this problem which has worked for me so far is removing apply plugin: kotlin-android-extensions from gradle, Sync gradle plugin and then add it again.