Android DispatchingActivityInputor返回null

好吧，我已经为这件事绞尽脑汁好一阵子了。由于AndroidInjection的NPE，我的应用程序几乎立即失败。。。问题是DispatchingActivityInjector（injected）返回null，但我不知道哪里出错了

总之，这里是我所有的DI资料：

应用组件：

@Component(modules = {
        ImageCaptureModule.class,
        InjectorsModule.class
})
public interface AppComponent {
    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(Application application);

        AppComponent build();
    }

    void inject(Application application);
}

应用模块：

@Module
public class AppModule {
    private Context context;

    public AppModule(@NonNull Application application) {
        this.context = application;
    }
}

@Module
public class AppModule {
    private Context context;

    public AppModule(@NonNull Application application) {
        this.context = application;
    }

    @Provides
    @Singleton
    Context provideContext() {
        return context;
    }

    @Provides
    @Singleton
    CameraManager provideCameraManager() {
        return new CameraManager();
    }
}

注射模块：

@Module(includes = AndroidSupportInjectionModule.class)
public abstract class InjectorsModule {
    @ActivityScope
    @ContributesAndroidInjector(modules = {ImageCaptureModule.class})
    abstract ImageCaptureActivity contributeImageCaptureActivity();
}

图像捕获模块：

@Module
public abstract class ImageCaptureModule {}

@Module
public abstract class ImageCaptureModule {}

应用程序：

@Inject DispatchingAndroidInjector<Activity> dispatchingActivityInjector;

@Override
public void onCreate() {
    DaggerAppComponent.builder().application(this).build().inject(this);
    super.onCreate();
}

@Override
public AndroidInjector<Activity> activityInjector() {
    return dispatchingActivityInjector;
}

这是stacktrace：

java.lang.RuntimeException: Unable to start activity ComponentInfo{ImageCaptureActivity}: java.lang.NullPointerException: mApplication.activityInjector() returned null
                                                                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2421)
                                                                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481)
                                                                         at android.app.ActivityThread.access$900(ActivityThread.java:155)
                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1349)
                                                                         at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                         at android.os.Looper.loop(Looper.java:174)
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5440)
                                                                         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.NullPointerException: Application.activityInjector() returned null
                                                                         at dagger.internal.Preconditions.checkNotNull(Preconditions.java:83)
                                                                         at dagger.android.AndroidInjection.inject(AndroidInjection.java:57)
                                                                         at ImageCaptureActivity.onCreate(ImageCaptureActivity.java:15)
                                                                         at android.app.Activity.performCreate(Activity.java:6285)
                                                                         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
                                                                         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2374)
                                                                         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481) 
                                                                         at android.app.ActivityThread.access$900(ActivityThread.java:155) 
                                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1349) 
                                                                         at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                         at android.os.Looper.loop(Looper.java:174) 
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5440) 
                                                                         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) 

---

好的，所以我稍微改变了应用程序的DI部分来修复错误，如果有人遇到同样的问题，这对我来说是有效的（就像Dagger 2.14.1一样）

活动注射器：

@Module(includes = AndroidInjectionModule.class)
public abstract class InjectorsModule {
    @ContributesAndroidInjector(modules = {ImageCaptureModule.class})
    @ActivityScope
    abstract ImageCaptureActivity contributeImageCaptureActivity();
}

图像捕获模块：

@Module
public abstract class ImageCaptureModule {}

@Module
public abstract class ImageCaptureModule {}

---

我也为这件事绞尽脑汁好一阵子了

你的

请改为注入应用程序类更改以注入您的应用程序类（如TestApplication）

---

请包括stacktraceSure的东西。。。Edited请原谅这些基本问题，但是你确定了吗？添加到你的应用程序组件中有帮助吗？考虑到您没有遇到ClassCastException，并且正在安装至少一个多绑定，这些不太可能是您的问题，但值得一问。我的应用程序已添加到清单中，但AndroidjectionModule未添加到AppComponent中。但我添加了它，重建了项目，并且出现了相同的错误。

@Component(modules = {
    ImageCaptureModule.class,
    InjectorsModule.class
})
public interface AppComponent {
    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(Application application);

        AppComponent build();
    }

    void inject(Application application);
}

@Component(modules = {
    ImageCaptureModule.class,
    InjectorsModule.class
})
public interface AppComponent {
    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(Application application);

        AppComponent build();
    }

    void inject(**TestApplication** application);
}