Question

需要帮助理解为什么将Splash Presenter作为null返回。我遵循干净的架构。

public class SplashActivity extends BaseActivity implements HasComponent<LoginComponent> {

    @Inject
    SplashPresenter splashPresenter;

    private LoginComponent loginComponent;


    @Override protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        //setContentView(R.layout.spla);

        this.initializeInjector();
        if (savedInstanceState == null) {
           // addFragment(R.id.fragmentContainer, new UserListFragment());
        }

        splashPresenter.initialize();
    }

    private void initializeInjector() {
        this.loginComponent = DaggerLoginComponent.builder()
                .applicationComponent(getApplicationComponent())
                .activityModule(getActivityModule())
                .loginModule(new LoginModule())
                .build();
    }

    @Override
    public LoginComponent getComponent() {
        return loginComponent;
    }
}

在我的活动中，SplashPresenter始终为空。

这是活动组件

@PerActivity
@Component(dependencies = ApplicationComponent.class, modules = ActivityModule.class)
public interface ActivityComponent {
  //Exposed to sub-graphs.
  Activity activity();
}

@Module
public class ActivityModule {
  private final Activity activity;

  public ActivityModule(Activity activity) {
    this.activity = activity;
  }

  /**
  * Expose the activity to dependents in the graph.
  */
  @Provides @PerActivity Activity activity() {
    return this.activity;
  }
}

这是我的LoginComponent

 @PerActivity
    @Component(dependencies = ApplicationComponent.class, modules = {ActivityModule.class, LoginModule.class})
    public interface LoginComponent extends ActivityComponent {


}

这是LoginModule

@Module
public class LoginModule {

    private User user;

    public LoginModule(){}

    public LoginModule(User user){this.user = user;}

    @Provides
  LoginRepository provideLoginRepository(LoginDataRepository loginRepository) {
    return loginRepository;
  }


    @Provides
    @PerActivity
    @Named("isUserLoggedIn")
    UseCase provideIsUserLoggedInUseCase(IsUserLoggedIn isUserLoggedIn){
        return isUserLoggedIn;
    }

    @Provides
    @PerActivity
    @Named("login")
    UseCase provideLoginUseCase(LoginRepository loginRepository, ThreadExecutor threadExecutor, PostExecutionThread postExecutionThread){
        return new Login(user,loginRepository,threadExecutor,postExecutionThread);
    }

    @Provides
    @PerActivity
    @Named("logOut")
    UseCase provideLogoutUseCase(LoginRepository loginRepository, ThreadExecutor threadExecutor, PostExecutionThread postExecutionThread){
        return new LogOut(user,loginRepository,threadExecutor,postExecutionThread);
    }
}

在BaseActivity中我正在做以下

public abstract class BaseActivity extends Activity {

  @Inject Navigator navigator;

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

  protected ActivityModule getActivityModule() {
    return new ActivityModule(this);
  }

}

仍然我无法理解为什么我的演示者在SplashActivity中为null

这是我的Splash Presenter

@PerActivity
public class SplashPresenter implements  Presenter {

    private final UseCase isUserLoggedIn;

    private SplashView splashView;

    @Inject
    public SplashPresenter(@Named("isUserLoggedIn") UseCase isUserLoggedIn) {
        this.isUserLoggedIn = isUserLoggedIn;
    }
}

Answer 1

loginComponent的实例在inject method之后创建。

将组件初始化程序移动到自定义Application类。或者将组件初始值设定项移至BaseActivity，inject method至SlashActivity

并且您要在Component接口处为每个要注入实例的Activity创建inject declaration。

匕首2：Presenter为空

1 个答案: