在 Kotlin 中 Dagger 2 的未解决引用问题

7

我正在尝试在使用Kotlin编写的Android项目中使用Dagger 2。我从Dagger 2存储库android-simple中取了一个示例。我已经成功地使用dagger-android-gradle-sample中的示例对Android Studio中的项目进行了正确配置,其中包含了正确配置的gradle文件。

现在,我开始将Java类更改为Kotlin。以下是自动转换后的DemoApplication.java代码:

public class DemoApplication : Application() {

    Singleton
    Component(modules = array(javaClass<AndroidModule>()))
    trait ApplicationComponent {
        public fun inject(application: DemoApplication)
        public fun inject(homeActivity: HomeActivity)
        public fun inject(demoActivity: DemoActivity)
    }

    public var component: ApplicationComponent? = null

    override fun onCreate() {
        super.onCreate()
        component = `Dagger_DemoApplication$ApplicationComponent`.builder().androidModule(AndroidModule(this)).build()
        component!!.inject(this)
    }
}

Dagger生成的类在Kotlin中可见,但是它抱怨类名中使用了($)符号。在Kotlin中,($)具有特殊用途,所以我想这就是原因。您可以注意到自动转换使用(`)符号包装了类名,因此编辑器不会抱怨。不幸的是,编译器出现以下错误:

Error:(32, 21) Unresolved reference: `Dagger_DemoApplication$ApplicationComponent`

:app:compileDebugKotlin FAILED

如果我尝试从终端构建它,也会出现异常:

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:compileDebugKotlin'.
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
        at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
        at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
        at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:305)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:79)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:63)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:51)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:23)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:88)
        at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
        at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
        at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)
        at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149)
        at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106)
        at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:80)
        at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:33)
        at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:24)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:36)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
        at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:51)
        at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
        at org.gradle.launcher.Main.doAction(Main.java:33)
        at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
        at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
        at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:33)
        at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:130)
        at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
Caused by: org.gradle.api.GradleException: Compilation error. See log for more details
        at org.jetbrains.kotlin.gradle.tasks.KotlinCompile.compile(Tasks.kt:130)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:218)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:211)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:200)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:579)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:562)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
        ... 47 more

有人知道如何解决这个问题吗?如果不知道,我就要继续使用Dagger_*在Java中。


我在 Kotlin 的 bug 追踪器中提交了一个问题:https://youtrack.jetbrains.com/issue/KT-6444,欢迎订阅以获取更新。 - Andrey Breslav
1个回答

9
你可以等待来解决这个问题!请参见https://github.com/google/dagger/issues/58
在首次发布之前(希望尽快),所有生成的代码中的$符号都将被删除。
此外,我建议向Jetbrains报告此行为的错误,因为$是类名称中完全有效的字符。

从最近的演示中我听说 Kotlin 还不能很好地与注解一起使用。那么问题只在于生成的代码命名上,还是与 Kotlin 的注解处理有关? - Eugen Martynov
@EugenMartynov 但在美元符号 $ 被移除之前,仍需在 Java 中保留 @Component 接口和 @Module 类。 - Damian Petla
感谢澄清!我从这里(https://www.youtube.com/watch?v=Uq0DEmxeBBw)获取了信息,但没有解释出错的原因。 - Eugen Martynov
很遗憾,Dagger2注入在Kotlin的类中无法工作。我已经报告了一个问题https://youtrack.jetbrains.com/issue/KT-6446 - Damian Petla

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