AppModule.provideViewModelFactories(AppModule.kt) 处的 NoClassDefFoundError

Question

我只在 Kitkat 设备上遇到此崩溃。我的 logcat 在下面。在 getViewModel

坠毁

Fatal Exception: java.lang.NoClassDefFoundError: kotlin.jvm.internal.Intrinsics
       at com.transferhome.di.AppModule.provideViewModelFactories(AppModule.kt)
       at com.transferhome.di.AppModule_ProvideViewModelFactoriesFactory.provideViewModelFactories(AppModule_ProvideViewModelFactoriesFactory.java:34)
       at com.transferhome.di.DaggerAppComponent.getViewModelProviderFactory(DaggerAppComponent.java:281)
       at com.transferhome.di.DaggerAppComponent.access00(DaggerAppComponent.java:124)
       at com.transferhome.di.DaggerAppComponent$SplashActivitySubcomponentImpl.injectSplashActivity(DaggerAppComponent.java:920)
       at com.transferhome.di.DaggerAppComponent$SplashActivitySubcomponentImpl.inject(DaggerAppComponent.java:916)
       at com.transferhome.di.DaggerAppComponent$SplashActivitySubcomponentImpl.inject(DaggerAppComponent.java:909)
       at dagger.android.DispatchingAndroidInjector.maybeInject(DispatchingAndroidInjector.java:113)
       at dagger.android.DispatchingAndroidInjector.inject(DispatchingAndroidInjector.java:134)
       at dagger.android.AndroidInjection.inject(AndroidInjection.java:63)
       at dagger.android.support.DaggerAppCompatActivity.onCreate(DaggerAppCompatActivity.java:41)
       at com.transferhome.commons.BaseActivity.onCreate(BaseActivity.kt:41)
       at com.transferhome.splash.SplashActivity.onCreate(SplashActivity.kt:38)

哪里飞溅

class SplashActivity : BaseActivity() {

    private lateinit var viewModel: SplashViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        viewModel = getViewModel()

        viewModel.onMoveToNext.listen(this) {
            Handler().postDelayed({
                openActivityAndClearTask(it)
            }, 2000)
        }
    }
}

BaseActivity.kt

abstract class BaseActivity : DaggerAppCompatActivity() {

    @Inject
    lateinit var factories: ViewModelProvider.Factory

    inline fun <reified T : ViewModel> getViewModel(): T {
        return ViewModelProviders.of(this, factories)[T::class.java]
    }
}

其中 AppModule.kt

@Module
class AppModule {

    @Provides
    fun provideViewModelFactories(viewModels: Map<Class<out ViewModel>,
            @JvmSuppressWildcards Provider<ViewModel>>):
            ViewModelProvider.Factory {
        return object : ViewModelProvider.Factory {
            override fun <T : ViewModel?> create(modelClass: Class<T>): T {
                val factory = viewModels[modelClass]?.get() ?: error(
                    "No factory provided against ${modelClass.name}"
                )
                @Suppress("UNCHECKED_CAST")
                return factory as T
            }
        }

    }
}

编辑

class App : DaggerApplication() {

    override fun applicationInjector(): AndroidInjector<out DaggerApplication> {
        return DaggerAppComponent.builder().addContext(this).build()
    }

    override fun onCreate() {
        super.onCreate()
        MultiDex.install(this)
    }
}

Answer 1

确保您 configured Kotlin in Android project 的方式正确：

kotlin-android Gradle 插件添加到构建中：

plugins {
    id("com.android.application")
    kotlin("android") // This one is important
    ...
}

包含标准库依赖：

dependencies {
    ...
    implementation(kotlin("stdlib-jdk7", KotlinCompilerVersion.VERSION))
    ...
}

查看 this repo 中的示例项目。

Answer 2

如果这仅发生在 Kitkat 上，则可能是多 dexing 问题。

您应该执行以下操作：

android {
    defaultConfig {
        ...
        minSdkVersion 15 
        targetSdkVersion 28
        multiDexEnabled true
    }
    ...
}

dependencies {
  implementation 'com.android.support:multidex:1.0.3'
}

在 AndroidManifest 中：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapp">
    <application
            android:name="com.acme.myapp.CustomApplication" >
        ...
    </application>
</manifest>

在 CustomApplication 中：

public class CustomApplication extends Application {
  @Override
  protected void attachBaseContext(Context base) {
     super.attachBaseContext(base);
     MultiDex.install(this);
  }
}

AppModule.provideViewModelFactories(AppModule.kt) 处的 NoClassDefFoundError

NoClassDefFoundError at AppModule.provideViewModelFactories(AppModule.kt)

android

gradle

kotlin

dagger-2

viewmodelproviders