android - Unresolved reference : isInitialized on lateinit property

Question

我想在 lateinit 属性上使用 isInitialized 方法，但我不能，因为编译器用红色下划线显示错误“未解析的引用”

这是代码:

class MainViewModel: ViewModel()
{
    lateinit var myData: MutableLiveData<Data>

    fun getData() {
        if (this::myData.isInitialized)
    }
}

由于那个错误，我不能再进一步了......

这是我的 gradle 文件:

项目.gradle:

kotlin_version = '1.3.72'

dependencies {
        classpath 'com.android.tools.build:gradle:3.6.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}

应用等级:

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation "androidx.appcompat:appcompat:1.1.0"
    implementation "androidx.core:core-ktx:1.2.0"
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0"
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0"
    implementation "androidx.lifecycle:lifecycle-common-java8:2.2.0"

Answer 1

您可能需要检查您的依赖项是否对应:

implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
kapt 'androidx.lifecycle:lifecycle-compiler:2.2.0'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'

compiler是非常必要的。