Dagger 2：必须设置模块

Question

我是 Dagger 2 的新手。我已经尝试过设置。这是我的ActivityModule：

@Module
public abstract class ActivityModule {
    @ContributesAndroidInjector
    abstract ProductListActivity contributeProductListActivity();

    @ContributesAndroidInjector
    abstract ProductDetailsActivity contributeProductDetailsActivity();
}

我的AppModule：

@Module
class AppModule {

@Provides
    @Singleton
    RedMartProductService provideRedMartProductService() {
        ........
    }
    ........
    .......
}

我的AppComponent：

@Singleton
@Component(modules = {AndroidInjectionModule.class, ActivityModule.class, AppModule.class})
public interface AppComponent {
    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(Application application);

        AppComponent build();
    }

    void inject(MartApplication martApp);
}

我的应用程序：

public class MartApplication extends Application implements HasActivityInjector {

    @Inject
    DispatchingAndroidInjector<Activity> dispatchingAndroidInjector;

    @Override
    public void onCreate() {
        super.onCreate();
        AppInjector.init(this);
    }

    @Override
    public DispatchingAndroidInjector<Activity> activityInjector() {
        return dispatchingAndroidInjector;
    }
}

在AppInjector中：

public class AppInjector {
private AppInjector() {
}

public static void init(MartApplication application) {
    DaggerAppComponent.builder().application(application)
            .build().inject(application);
    application
            .registerActivityLifecycleCallbacks(new Application.ActivityLifecycleCallbacks() {
                @Override
                public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
                    handleActivity(activity);
                }

                ............
            });
}

private static void handleActivity(Activity activity) {
    if (activity instanceof Injectable) { //HasSupportFragmentInjector) {
        AndroidInjection.inject(activity);
    }
    if (activity instanceof FragmentActivity) {
        ((FragmentActivity) activity).getSupportFragmentManager()
                .registerFragmentLifecycleCallbacks(
                        new FragmentManager.FragmentLifecycleCallbacks() {
                            @Override
                            public void onFragmentCreated(FragmentManager fm, Fragment f,
                                                          Bundle savedInstanceState) {
                                if (f instanceof Injectable) {
                                    AndroidSupportInjection.inject(f);
                                }
                            }
                        }, true);
    }
}

}

在注入时抛出异常：

java.lang.RuntimeException: Unable to create application com.kaushik.myredmart.MartApplication: java.lang.IllegalStateException: com.kaushik.myredmart.di.AppModule                              must be set at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4710)
                                                 at android.app.ActivityThread.-wrap1(ActivityThread.java)
                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                 at android.os.Looper.loop(Looper.java:148)
                                                 at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                              Caused by: java.lang.IllegalStateException: com.mymart.di.AppModule must be set
                                                 at com.kaushik.myredmart.di.DaggerAppComponent$Builder.build(DaggerAppComponent.java:180)
                                                 at com.kaushik.myredmart.di.AppInjector.init(AppInjector.java:30)
                                                 at com.kaushik.myredmart.MartApplication.onCreate(MartApplication.java:28)
                                                 at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1013)
                                                 at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4707)
                                                 at android.app.ActivityThread.-wrap1(ActivityThread.java) 
                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405) 
                                                 at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                 at android.os.Looper.loop(Looper.java:148) 
                                                 at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                 at java.lang.reflect.Method.invoke(Native Method)

谁能帮我弄清楚我的设置中的实际问题在哪里？

Answer 1

我认为AppModule 必须在 AppComponent 的 Builder 界面中设置，并且应该在创建 AppComponent 时提供。

应用组件：

@Singleton
@Component(modules = {AndroidInjectionModule.class, ActivityModule.class, AppModule.class})
public interface AppComponent {
    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(Application application);

        Builder appModule(AppModule appModule); // add this

        AppComponent build();
    }

    void inject(MartApplication martApp);
}

AppInjector：

init 方法内部：

DaggerAppComponent.builder()
.application(application)
.appModule(new AppModule()) // add this
.build()
.inject(application);

Answer 2

您需要将@ContributesAndroidInjector 添加到ActivityModule 中的抽象方法中

@Module
public abstract class ActivityModule {
    @ContributesAndroidInjector
    abstract ProductListActivity contributeProductListActivity();

    @ContributesAndroidInjector
    abstract ProductDetailsActivity contributeProductDetailsActivity();
}

Answer 3

Kotlin 版本。 AppComponent.kt：

import com.domain.app_name.core.domain.App
import com.domain.app_name.splash.di.SplashModule
import com.domain.app_name.splash.presentation.BusinessLoginBottomSheet
import dagger.Component
import dagger.android.AndroidInjectionModule
import javax.inject.Singleton
import dagger.BindsInstance

@Singleton
@Component(modules = [
    AndroidInjectionModule::class,
    AppModule::class,
    SplashModule::class
])
interface AppComponent {

    @Component.Builder
    interface Builder {
        @BindsInstance
        fun app(app : App) : Builder
        fun appModule(appModule : AppModule) : Builder
        fun build() : AppComponent
    }

    fun inject(app : App)
    fun inject(businessLoginBottomSheet : BusinessLoginBottomSheet)
    fun inject(appModule : AppModule)
}

App.kt：

import android.app.Application
import com.domain.app_name.core.di.AppModule
import com.domain.app_name.core.di.DaggerAppComponent
import dagger.android.AndroidInjector
import dagger.android.DispatchingAndroidInjector
import dagger.android.HasAndroidInjector
import javax.inject.Inject

class App : Application(), HasAndroidInjector {

    @Inject
    lateinit var injector: DispatchingAndroidInjector<Any>

    override fun onCreate() {
        super.onCreate()
        DaggerAppComponent.builder()
            .app(this)
            .appModule(AppModule(this))
            .build()
            .inject(this)
    }

    override fun androidInjector() : AndroidInjector<Any> {
        return injector
    }
}

Answer 4

你的 Di 的整个结构看起来有点奇怪。使用所有这些复杂性的任何特定原因（记住你说你是 Dagger 的新手，并且它的所有教程都没有任何接近你的实现的东西）？