如何在模块中提供动态字符串，例如（服务器响应）？

Question

我最近在我的项目中使用了来自 New Android 带 Dagger 2 的注射器，但我遇到了一个问题：我想提供一个带匕首的动态字符串，但我不知道该怎么做；我从服务器收到一个令牌，需要将其作为字段传递给 OkHttp3CookieHelper 的实例；我该怎么做？

我试图将此字符串传递给模块构造函数，但我认为这不是真的！我想也许应该使用 @BindsInstance !! 请帮助 ;)

这是我的应用模块：

@Module(subcomponents = {MainActivityComponent.class})
    public class AppModule {

    private String cookie ;

    public AppModule(String Cookie){
        this.cookie = Cookie;
    }

    @Singleton
    @Provides
    Context provideContext(Application application) {
        return application;
    }

    @Singleton
    @Provides
    OkHttp3CookieHelper provideCookie(@Named("baseURL") String baseURL,
                                      @Named("csrfToken") String csrfToken) {
        OkHttp3CookieHelper cookieHelper = new OkHttp3CookieHelper();
        cookieHelper.setCookie(baseURL, csrfToken, cookie);
        return cookieHelper;
    }
    @Singleton
    @Provides
    OkHttpClient.Builder provideOkHttp(HttpLoggingInterceptor interceptor,
                                       OkHttp3CookieHelper cookieHelper) {
        final OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
        httpClient.connectTimeout(8, TimeUnit.SECONDS);
        httpClient.readTimeout(8, TimeUnit.SECONDS);
        httpClient.callTimeout(8, TimeUnit.SECONDS);
        httpClient.cookieJar(cookieHelper.cookieJar());
        httpClient.addInterceptor(interceptor);
        return httpClient;
    }
    @Singleton
    @Provides
    HttpLoggingInterceptor provideHttpInterceptor() {
        final HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        return interceptor;
    }
    @Singleton
    @Provides
    GsonConverterFactory provideGsonConverterFactory() {
        return GsonConverterFactory.create();
    }
    @Singleton
    @Provides
    @Named("baseURL")
    String provideBaseURL() {
        return Const.BASE_URL;
    }
    @Singleton
    @Provides
    @Named("csrfToken")
    String provideCrfToken() {
        return Const.CRF_TOKEN;
    }
    @Singleton
    @Provides
    Api provideApi(Retrofit retrofit) {
        return retrofit.create(Api.class);
    }
    @Singleton
    @Provides
    Retrofit provideRetrofit(GsonConverterFactory converterFactory, OkHttpClient.Builder httpClient,
                             @Named("baseURL") String baseURL) {
        return new Retrofit.Builder().baseUrl(baseURL)
                                     .addConverterFactory(converterFactory)
                                     .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                                     .client(httpClient.build())
                                     .build();
    }
    @Singleton
    @Provides
    SharedPreferences provideSharedPreference(Context context) {
        return context.getSharedPreferences("myShp", Context.MODE_PRIVATE);
    }

    //and this is my AppComponent : 

       @Singleton
       @Component(modules = {AndroidInjectionModule.class, ActivityBuilder.class, AppModule.class, 
                 ViewModelFactoryModule.class})
       public interface AppComponent {
         @Component.Builder
         interface Builder {
         @BindsInstance
         Builder application(Application application);
         AppComponent build();
         }

      void inject(App app);
}

问题： dagger could not create instance from AppModule !

Answer 1

最后，经过大约 10 个小时的搜索和阅读，我解决了我的 issue:D

NOTICE !

不需要自己传递你的响应令牌也不需要将依赖项（在本例中是响应令牌）绑定到 AppComponent 但如果你想这样做你可以使用 @Component.Builder 或 @Component.Factory 你可以使用这篇有用的文章： Dagger2: @Component.Factory and @SubComponent.Factory

但要解决问题：

首先应将此依赖项添加到 app.gradle 文件：

implementation 'com.github.franmontiel:PersistentCookieJar:v1.0.1'

然后在 appMoule class 中提供 PersistentCookieJar 的实例和传递给我们的 OkHttpClient 实例：

@Singleton
@Provides
PersistentCookieJar ProvideCookieJar(Context context) {
    return new PersistentCookieJar(new SetCookieCache(),
                                   new SharedPrefsCookiePersistor(context));
}

@Singleton
@Provides
OkHttpClient.Builder provideOkHttp(HttpLoggingInterceptor interceptor,
                                   PersistentCookieJar persistentCookieJar) {
    final OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
    httpClient.connectTimeout(8, TimeUnit.SECONDS);
    httpClient.readTimeout(8, TimeUnit.SECONDS);
    httpClient.callTimeout(8, TimeUnit.SECONDS);
    httpClient.cookieJar(persistentCookieJar);
    httpClient.addInterceptor(interceptor);
    return httpClient;
}

不要忘记提供需要创建 PersistentCookieJar 实例的 Context :

@Provides
@Singleton
Context provideContext(Application application) {
    return application;
}

并且在您的应用程序中 class 应该绑定您的应用程序 class :

DaggerAppComponent.builder()
                      .application(this)
                      .build()
                      .inject(this);

你的 AppComponent 应该是这样的：

@Singleton
@Component(modules = {AndroidInjectionModule.class, ActivityBuilder.class, 
                      AppModule.class, ViewModelFactoryModule.class})
public interface AppComponent {
   @Component.Builder
   interface Builder {
      @BindsInstance
      Builder application(Application application);
      AppComponent build();
   }
 
  void inject(App app);
}

好的，一切都完成了！现在你的请求包含 cookie 并成功获得服务器响应:)

如何在模块中提供动态字符串，例如（服务器响应）？

how to provide dynamic String such as ( server response ) in module?

java

android

dagger-2

androidinjector

但要解决问题：