不推荐使用Dagger 2.2组件构建器模块方法 [英] Dagger 2.2 component builder module method deprecated

问题描述

我开始使用dagger 2.2，并且不赞成使用组件"构建器中的模块方法.

I started using dagger 2.2 and the module methods in the Component builder are deprecated.

这是我的应用程序组件:

This is my Application component :

@Component(modules = ApplicationModule.class)
public interface ApplicationComponent {
    void inject(Application application);
}

以及应用程序模块:

@Module
public class ApplicationModule {
    Application application;

    public ApplicationModule(Application application) {
        this.application = application;
    }

    @Provides
    @Singleton
    Application providesApplication() {
        return application;
    }
}

这是生成的类:

@Generated(
  value = "dagger.internal.codegen.ComponentProcessor",
  comments = "https://google.github.io/dagger"
)
public final class DaggerApplicationComponent implements ApplicationComponent {
  private DaggerApplicationComponent(Builder builder) {
    assert builder != null;
  }

  public static Builder builder() {
    return new Builder();
  }

  public static ApplicationComponent create() {
    return builder().build();
  }

  @Override
  public void inject(Application application) {
    MembersInjectors.<Application>noOp().injectMembers(application);
  }

  public static final class Builder {
    private Builder() {}

    public ApplicationComponent build() {
      return new DaggerApplicationComponent(this);
    }

    /**
     * @deprecated This module is declared, but an instance is not used in the component. This method is a no-op. For more, see https://google.github.io/dagger/unused-modules.
     */
    @Deprecated
    public Builder applicationModule(ApplicationModule applicationModule) {
      Preconditions.checkNotNull(applicationModule);
      return this;
    }
  }
}

如果不使用ComponentBuilder，如何初始化组件?

How do I initialize the component if not with the ComponentBuilder?

推荐答案

您应该阅读为什么不推荐使用的描述. 如果您使用的是像IntelliJ或Android Studio这样的IDE，您只需选择方法，然后在Windows上按 Control + Q 即可阅读包含弃用声明的Javadoc.

You should read the description of why it is deprecated. If you are using an IDE like IntelliJ or Android Studio you can just select the method and hit Control + Q on Windows to read the Javadoc including the deprecation notice.

Javadoc读取:

The Javadoc reads:

@deprecated声明了此模块，但组件中未使用实例.此方法是禁止操作的.有关更多信息，请参见 https://google.github.io/dagger/unused-modules .

从此链接中您可以看到:

And from this link you can see:

Dagger处理器生成组件时，仅需要提供绑定请求的模块和组件依赖项实例.

When the Dagger processor generates components, it only requires instances of modules and component dependencies that are explicitly needed to supply requests for a binding.

• 如果组件中使用的所有模块方法都是静态的，则Dagger完全不需要该模块的实例. Dagger可以直接调用静态方法而无需模块.
• 如果模块不为Component提供任何绑定，则不需要该模块的实例即可构造图形.

---

可以肯定地说，您可以忽略弃用.旨在通知您未使用的方法和模块.一旦您实际需要/在子图中的某处使用Application，就将需要该模块，并且弃用警告将消失.

---

It is safe to say that you can just ignore the deprecation. It is intended to notify you of unused methods and modules. As soon as you actually require / use Application somewhere in your subgraph the module is going to be needed, and the deprecation warning will go away.

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