无法从 Java 代码注入 Kotlin 依赖组件

Question

使用最新版本的 Dagger 2，

    implementation 'com.google.dagger:dagger:2.51.1'
    annotationProcessor 'com.google.dagger:dagger-compiler:2.51.1'
    kapt "com.google.dagger:dagger-compiler:2.51.1"

我无法使用 Dagger 2 从 Activity 注入对象，依赖注入组件和模块是用 Kotlin 编写的。

public class MainActivity extends BaseActivity {
    
        @Inject permissionHelper permissionHelper;
        @Inject MbAppFeature mpAppFeature;
        @Inject SharedPref sharedPref;
        @Inject ViewMvcFactory viewMvcFactory;
    
    
    @SuppressLint({"ResourceType", "SuspiciousIndentation"})
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        getInjector().inject(this);
        super.onCreate(savedInstanceState);
    
    
        scanModeNumber = sharedPref.read("scanModeNumber",0);
        isFirstRun = sharedPref.read("isFirstRun", true);

}

kotlin 代码中的基本 Activity

    open class BaseActivity: AppCompatActivity() {
    
        private val appCompositionRoot get() = (application as CustomApplication).appComponent
    
        val activityComponent by lazy {
            DaggerActivityComponent.builder()
                .activityModule(ActivityModule(this, appCompositionRoot))
                .build()
        }
    
        private val controllerComponent by lazy {
            DaggerControllerComponent.builder()
                .controllerModule(ControllerModule(activityComponent))
                .build()
        }
    
    
        public val injector get() = controllerComponent
    }

kotlin 代码中的组件

@Component(modules = [ControllerModule::class])
interface ControllerComponent {

    fun inject(activity: MainActivity)

}

@Module
class  ControllerModule
    (private val activityComponent: ActivityComponent)

{
    @Provides
    fun activity() = activityComponent.activity()

    @Provides
    fun layoutInflater()
            = activityComponent.layoutInflater()

    @Provides
    fun sharedPref() = activityComponent.sharedPref()

错误日志

引起：java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法“java.lang.Integer SharedPref.read(java.lang.String, int)” 在（MainActivity.java:147）

我可以在 Dagger 控制器组件中看到注入方法是空的，有什么建议如何解决这个问题：

   @Override
    public void inject(ReadIDActivity activity) {
    }

    @Override
    public void inject(ResultsIDActivity activity) {
    }

    @Override
    public void inject(CertificateHandling activity) {
    }

    @Override
    public void inject(MainActivity activity) {
    }

    @Override
    public void inject(LaunchCheckFragment LaunchCheckFragment) {
    }   

                                                            

Answer 1

要在您的活动中启用成员注入，请使用 @AndroidEntryPoint 注释您的类

参考https://dagger.dev/hilt/android-entry-point.html