我在使用 Instant Run 运行项目后遇到了这个异常:

java.lang.IllegalAccessError: Illegal class access: 'com.alla.kotlinexample.MainActivity$override' attempting to access 'kotlin.jvm.internal.DefaultConstructorMarker' (declaration of 'com.alla.kotlinexample.MainActivity$override' appears in /data/data/com.alla.kotlinexample/files/instant-run/dex-temp/reload0x0000.dex)
at com.alla.kotlinexample.MainActivity$override.onCreate(MainActivity.kt:21)
at com.alla.kotlinexample.MainActivity$override.access$dispatch(MainActivity.kt)

代码如下:

class MainActivity : AppCompatActivity() {  

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)

        val persons: List<Person> = listOf<Person>(Person("Person1"), Person("Person2", 27))

        fab.setOnClickListener { view ->
            Snackbar.make(view, persons[1].name, Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show()
        }

        tv_person_name.text = persons.maxBy { it.age ?: 34 }.toString()
    }

    data class Person(val name: String, val age: Int? = null)


}

而这一行的错误点val persons: List<Person> = listOf<Person>(Person("Person1"), Person("Person2", 27))

Android Studio 版本为 3.0.1 Gradle :classpath 'com.android.tools.build:gradle:3.0.1' Gradle 版本是 4.1

build.gradle:

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.alla.kotlinexample"
        minSdkVersion 21
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.android.support:design:26.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

根等级:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.2.10'
    //ext.kotlin_version = '1.1.51'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

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

最佳答案

我在构造函数上使用@JvmOverloads 时遇到了类似的问题。然而，当我自己定义构造函数时，它看起来像 Instant Run 工作:

代替:

class StaticRefreshAnimationView @JvmOverloads constructor(
        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : LottieRefreshAnimationView(context, attrs, defStyleAttr) {

我现在用:

class StaticRefreshAnimationView(context: Context, attrs: AttributeSet?, defStyleAttr: Int) :
        LottieRefreshAnimationView(context, attrs, defStyleAttr) {
    constructor(context: Context, attrs: AttributeSet?) : this(context, attrs, 0)
    constructor(context: Context) : this(context, null)

关于android - 在 Kotlin 中使用 Instant Run 时出现 IllegalAccessError，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48152781/