我是 Dagger 2 的新手。我已经尝试过设置它。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);
}

我的申请:

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);
    }
}

它在注入(inject)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)

任何人都可以帮助我了解我的设置中的实际问题所在吗？

最佳答案

我相信 AppModule 必须在 AppComponent 的 Builder 接口(interface)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);
}

应用注入(inject)器:

init 方法内部:

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

关于android - Dagger 2 : Module must be set，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45349863/