未解决的参考:导航:androidx.navigation.ui.AppBarConfiguration

时间:2019-07-05 08:14:50

标签: androidx

在Android Studio 3.4中。

在gradle.properties中:

android.useAndroidX=true
android.enableJetifier=true

在app / build.gradle中:

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

活动中:

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.navigation.ui.AppBarConfiguration

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val appBarConfiguration = AppBarConfiguration(navController.graph)
    }
}

但是我在这一行中遇到编译错误:

import androidx.navigation.ui.AppBarConfiguration

错误消息:

Unresolved reference: navigation

1 个答案:

答案 0 :(得分:1)

我相信您不见了:

 implementation "androidx.navigation:navigation-fragment-ktx:2.1.0-alpha05"
 implementation "androidx.navigation:navigation-ui-ktx:2.1.0-alpha05"