未解析的引用:viewModels

Question

我是android kotlin的新手，我正在使用我的OCR应用程序中的viewModel。“导入androidx.fragment.app.viewModels”没有显示。我是否添加了所有必要的dependencies.What错误？

以下是依赖项。

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.3.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'



    implementation 'com.google.android.material:material:1.2.1'

    //lottie animation
    implementation 'com.airbnb.android:lottie:3.4.1'

    // Add CameraX dependencies
    def camerax_version = "1.0.0-beta05"
    implementation "androidx.camera:camera-core:${camerax_version}"
    implementation "androidx.camera:camera-camera2:${camerax_version}"
    implementation "androidx.camera:camera-lifecycle:${camerax_version}"
    implementation "androidx.camera:camera-view:1.0.0-alpha12"

    // Add ML Kit dependencies
    implementation 'com.google.android.gms:play-services-mlkit-text-recognition:16.0.0'
    implementation 'com.google.mlkit:language-id:16.0.0'
    implementation 'com.google.mlkit:translate:16.0.0'



}

这就是导入错误。

​

​

Answer 1

添加此依赖项以在片段中使用by viewModels()：

implementation 'androidx.fragment:fragment-ktx:1.2.5'