未解决的对视图模型的引用

Question

我的视图模型类的导入语句存在一些问题。如果我在导致错误的两个 ViewModel 及其依赖项中清理或添加一行，我可以再次成功构建。但是，如果我更改了我的活动/片段中的任何内容并尝试在不清理的情况下重新构建，则会在我注入的一组视图模型上给我“未解决的参考”。

我在我的 gradle 文件中尝试了各种不同的配置，但无济于事。 我尝试了不同的 android studio 版本、不同的 Hilt 版本、Kotlin 版本。使缓存无效，重新启动和其他一切。请有人帮助我！

我已尝试将我的配置以及我的 MainActivity 导入语句和未解析引用所指的视图模型之一粘贴到下面。

主要活动

import androidx.activity.viewModels
import androidx.appcompat.app.AppCompatActivity

import androidx.navigation.NavController
import com.fauna.fauna.appointments.AppointmentsViewModel
import com.fauna.fauna.clinic.ClinicViewModel
import com.fauna.fauna.databinding.ActivityMainBinding
import com.fauna.fauna.dischargeNotes.DischargeNotesViewModel
import com.fauna.fauna.vaccinationCards.VaccinationCardsViewModel
import com.fauna.fauna.updateApp.UpdateAppDialogFragment
import com.fauna.fauna.user.UserViewModel
import dagger.hilt.android.AndroidEntryPoint

@AndroidEntryPoint
class MainActivity : AppCompatActivity(), CoroutineScope { 

    private val vaccinationCardsViewModel: VaccinationCardsViewModel by viewModels()

    //Some functionality 
} 

疫苗接种卡视图模型

import androidx.lifecycle.viewModelScope
import com.fauna.fauna.fragment.VaccinationCardDetail
import com.fauna.fauna.util.NotificationService
import com.fauna.fauna.util.Result
import com.fauna.fauna.util.SnackBarViewModel
import com.fauna.fauna.util.getSeconds
import dagger.hilt.android.lifecycle.HiltViewModel
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.channels.ConflatedBroadcastChannel
import kotlinx.coroutines.flow.catch
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.launch
import javax.inject.Inject

@HiltViewModel
class VaccinationCardsViewModel @Inject constructor(
    private val vaccinationCardsRepository: VaccinationCardsRepository,
    private val notificationService: NotificationService
) : SnackBarViewModel() { //Some functionality} 

build.gradle 文件

buildscript {
    ext.kotlin_version = '1.5.21'
    ext.apollo_version = '2.5.5'
    ext.hilt_version = '2.37'
    def nav_version = '2.3.2'
    repositories {
        google()
        mavenCentral()

    }
    dependencies {
        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
        classpath 'com.android.tools.build:gradle:7.0.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"

    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

build.gradle 应用文件

    id("com.android.application")
    id("kotlin-android")
    id("com.apollographql.apollo").version("$apollo_version")
    id("androidx.navigation.safeargs.kotlin")
    id("kotlin-kapt")
    id("dagger.hilt.android.plugin")
    id('com.google.gms.google-services')
    id('com.google.firebase.crashlytics')
}

android {
    signingConfigs {
        debugConfig {
            //..omittet..
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
    compileSdkVersion 30
    buildToolsVersion "29.0.3"
    defaultConfig {
        applicationId "com.fauna.fauna"
        minSdkVersion 23
        targetSdkVersion 30
        versionCode 15
        versionName "0.8"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }

    lintOptions {
        abortOnError false
    }

    buildFeatures {
        viewBinding true
    }
    buildTypes {
        //..Omittet..

    }
    compileOptions {
        // Flag to enable support for the new language APIs
        coreLibraryDesugaringEnabled true
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'androidx.core:core-ktx:1.6.0'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'

    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'

    def nav_version = "2.3.5"
    implementation "androidx.navigation:navigation-runtime-ktx:$nav_version"
    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"

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

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

    // Jetpack Compose Integration
    implementation "androidx.navigation:navigation-compose:2.4.0-alpha06"
    implementation "androidx.security:security-crypto:1.1.0-alpha03"

    testImplementation 'junit:junit:4.13.1'
    androidTestImplementation 'androidx.test:runner:1.4.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

    //View model
    implementation "androidx.activity:activity-ktx:1.3.1"
    implementation "androidx.fragment:fragment-ktx:1.3.6"

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

kapt {
    correctErrorTypes = true
}

hilt {
    enableExperimentalClasspathAggregation = true
}

apollo {
    generateKotlinModels.set(true)
}

beforeEvaluate {
    getApiKey()
}

def getSecretKey(string) {
    def keysFile = file("secret.properties")
    def keysProperties = new Properties()
    keysProperties.load(new FileInputStream(keysFile))
    def key = keysProperties[string]
    println "key: " + key
    return key
}

apply plugin: 'com.google.gms.google-services'
apply plugin: 'com.google.firebase.crashlytics' 

构建项目时不清理时出错：

Task :app:compileDevKotlin

e: /main/java/com/fauna/fauna/MainActivity.kt: (19, 41): Unresolved reference: VaccinationCardsViewModel

e: /main/java/com/fauna/fauna/MainActivity.kt: (21, 29): Unresolved reference: UserViewModel

e: /main/java/com/fauna/fauna/MainActivity.kt: (47, 44): Unresolved reference: VaccinationCardsViewModel

e: /main/java/com/fauna/fauna/MainActivity.kt: (47, 73): Not enough information to infer type variable VM

e: /main/java/com/fauna/fauna/MainActivity.kt: (47, 73): Property delegate must have a 'getValue(MainActivity, KProperty<*>)' method. None of the following functions is suitable: 
public inline operator fun <T> Lazy<???>.getValue(thisRef: Any?, property: KProperty<*>): ??? defined in kotlin

e: /main/java/com/fauna/fauna/MainActivity.kt: (49, 32): Unresolved reference: UserViewModel

e: /main/java/com/fauna/fauna/MainActivity.kt: (49, 49): Not enough information to infer type variable VM

e: /main/java/com/fauna/fauna/MainActivity.kt: (49, 49): Property delegate must have a 'getValue(MainActivity, KProperty<*>)' method. None of the following functions is suitable: 
public inline operator fun <T> Lazy<???>.getValue(thisRef: Any?, property: KProperty<*>): ??? defined in kotlin

e: /main/java/com/fauna/fauna/MainActivity.kt: (175, 93): Unresolved reference: it

Answer 1

您好，您的刀柄版本可能是错误的，我遇到了类似的问题，以下设置对我有用，将其更改为 2.34-beta，您能否在构建 gradle 应用程序中尝试以下操作

//Dagger - Hilt
implementation "com.google.dagger:hilt-android:2.34-beta"
kapt "com.google.dagger:hilt-android-compiler:2.34-beta"

//extra dagger hilt dependecies for view model lifecycle attaching for your reference
implementation "androidx.hilt:hilt-lifecycle-viewmodel:1.0.0-alpha03"
kapt "androidx.hilt:hilt-compiler:1.0.0"
implementation 'androidx.hilt:hilt-navigation-compose:1.0.0-alpha03'

并将 min sdk 版本更改为

  minSdk 24

我的 kotlin gradle 插件在项目级别是 1.5.10（如果有帮助的话）

Answer 2

问题出在 Hilt 和我的 Apollo 架构文件生成的文件中。我的 android 项目中有一个名为 user 的包，我的 Apollo 架构目录中有一个名为 User 的子文件夹，这显然使 android studio 在后续构建中感到困惑。解决方案是要么删除 Apollo 架构目录中的子文件夹，要么将项目中的包命名与架构目录中的子文件夹不同。