无法向 build.gradle 文件添加导航依赖项

Question

Here is my build.gradle app or module file:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion '27.0.3'

    defaultConfig {
        applicationId "com.example.android.miwok"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}


dependencies {
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    compile fileTree(dir: 'libs', include: ['*.jar'])   
    testCompile 'junit:junit:4.12'  
    implementation 'com.android.support:appcompat-v7:23.3.0'
    implementation 'com.android.support:support-v4:23.3.0'
    implementation 'com.android.support:design:23.3.0'
    def nav_version = "2.2.1"

    // Java language implementation
    implementation "androidx.navigation:navigation-fragment:$nav_version"
    implementation "androidx.navigation:navigation-ui:$nav_version"

    // Kotlin
    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"

    // Dynamic Feature Module Support
    implementation "androidx.navigation:navigation-dynamic-features-fragment:$nav_version"

    // Testing Navigation
    androidTestImplementation "androidx.navigation:navigation-testing:$nav_version"
}

I also added the android.useAndroidX=true line to the properties file. Getting these Errors: ERROR: Failed to resolve: androidx.navigation:navigation-dynamic-features-fragment:2.2.1 ERROR: Failed to resolve: androidx.navigation:navigation-testing:2.2.1

Answer 1

The navigation-testing and navigation-dynamic-features-fragment artifacts were only introduced in Navigation 2.3.0-alpha01 with the current version being 2.3.0-alpha04 . You'll want to update your nav_version to at least that version if you want to use those artifacts.