Question

我有一个应用程序（模块+组件）

@Singleton
@Component(modules = AppModule.class)
public interface AppComponent {
    void inject(App app);

    Serializer getSerializer();

    ListOfCallingLists getListOfCallingLists();

    Context getContext();

    App getApp();
}

和

@Module
public class AppModule {

    private final App app;

    public AppModule(App app) {
        this.app = app;
    }

    @Provides
    Serializer provideSerializer() {
        return new BinarySerializer();
    }

    @Provides
    Context provideContext() {
        return app;
    }

    @Provides
    App provideApp() {
        return app;
    }
}

和

@Singleton
public class ListOfCallingLists implements Serializable {
   ...
    @Inject
    public ListOfCallingLists(Context context,
                              Serializer serializer) {
        this.serializer = serializer;
        ...
    }
}

App是应用程序，我在manifest中注册了它：

public class App extends Application {

    private AppComponent appComponent;

    public static App get(Context context) {
        return (App) context.getApplicationContext();
    }

    @Override
    public void onCreate() {
        super.onCreate();
        if (appComponent == null)
            appComponent = DaggerAppComponent.builder()
                    .appModule(new AppModule(this))
                    .build();
        appComponent.inject(this);
    }

    public AppComponent getComponent() {
        return appComponent;
    }
}

最后活动：

public class CallListsActivity extends AppCompatActivity {

    @Inject
    ListOfCallingLists list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
    }

    @Override
    public void onPostCreate(@Nullable Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);

        // list here is null why?
    }
}

Answer 1

在AppComponent中，您需要添加：

void inject(CallListsActivity callListActivity);

在您的CallListsActivity onCreate()中，您需要告诉您的CallListsActivity是如何注入的。

例如，构建您的AppComponent并注入活动，或者您可以使用新的android注入器：https://google.github.io/dagger/android.html

dagger2字段未注入

1 个答案: