Android build warning Mapping new ns to old ns

Question

I created a new project in android studio and added all the dependencies. All of them are latest. When I built the project I am getting these warnings. There is no code in the app. These started showing after I added the dependencies.

Should I just leave it like this?

Sync output

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-kapt'
    id 'dagger.hilt.android.plugin'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
    buildFeatures {
        viewBinding = true
    }
}

dependencies {

    def version_nav = "2.3.4"
    def lifecycle_version = "2.3.0"
    def version_retrofit_coroutines_adapter = "0.9.2"
    def version_kotlin_coroutines = "1.3.9"
    def version_moshi = "1.9.2"
    def retrofit ="2.9.0"
    def hilt_version = "2.31-alpha"
    def hilt_viewmodels = "1.0.0-alpha03"
    def fragment_ktx = "1.3.1"
    def okhttp = "4.9.0"
    def moshi_converter = "2.8.1"
    def recycler_view_version = "1.2.0-beta02"
    def timber_version = "4.7.1"
    def java_poet_version = "1.13.0"
    def coil_version = "1.1.1"


    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.3.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

    // Timber
    implementation "com.jakewharton.timber:timber:$timber_version"

    implementation "com.squareup.retrofit2:retrofit:$retrofit"
    implementation "com.squareup.retrofit2:converter-gson:$retrofit"

    // Moshi
    implementation "com.squareup.moshi:moshi:$version_moshi"
    implementation "com.squareup.moshi:moshi-kotlin:$version_moshi"
    implementation "com.squareup.retrofit2:converter-moshi:$moshi_converter"

    // Navigation
    implementation "androidx.navigation:navigation-fragment-ktx:$version_nav"
    implementation "androidx.navigation:navigation-ui-ktx:$version_nav"

    // Coroutines
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$version_kotlin_coroutines"
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$version_kotlin_coroutines"

    // Retrofit Coroutines Support
    implementation "com.jakewharton.retrofit:retrofit2-kotlin-coroutines-adapter:$version_retrofit_coroutines_adapter"

    //RecyclerView
    implementation "androidx.recyclerview:recyclerview:$recycler_view_version"

    // ViewModel
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
    // LiveData
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version"
    // Lifecycle only (without ViewModel or LiveData)
    implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycle_version"

    //OkHttp3
    implementation"com.squareup.okhttp3:okhttp:$okhttp"

    //Hilt
    implementation "com.google.dagger:hilt-android:$hilt_version"
    kapt "com.google.dagger:hilt-android-compiler:$hilt_version"

    //Hilt View models
    implementation "androidx.hilt:hilt-lifecycle-viewmodel:$hilt_viewmodels"
    kapt "androidx.hilt:hilt-compiler:$hilt_viewmodels"

    //Fragments
    implementation "androidx.fragment:fragment-ktx:$fragment_ktx"

    //Java Poet
    kapt "com.squareup:javapoet:$java_poet_version"

    //Coil
    implementation "io.coil-kt:coil:$coil_version"

}

kapt {
    correctErrorTypes true
}

The app is run without any issues but since this is a warning I have seen first time. I couldn't find anything related anywhere else, wanted to know why this is happening.

Answer 1

I had the same issue and turned out that the buildToolsVersion "30.0.3" used is not installed, so I switched to the installed buildToolsVersion "29.0.3" (in my case) and the warning disappeared.