具有不同作用域的模塊

Question

如何創建一個具有註釋的模塊，如@UserScope，依賴於另一個模塊是@Singleton？

@Module(includes = {ApplicationModule.class}) 
public class JobManagerModule 
{ 
    private static final String TAG = JobManagerModule.class.getSimpleName(); 

    @UserScope 
    @Provides 
    public JobManager providesJobManager(final Context context) 
    { 
     Log.d(TAG, "Providing JobManager"); 
     final Configuration configuration = new Configuration.Builder(context).build(); 
     return new JobManager(configuration); 
    } 
} 

這裏，JobManagerModule提供了使用@UserScope但ApplicationModule提供上下文對象（其JobManagerModule需要），爲@Singleton。

這顯示錯誤。

Answer 1

如果您要創建不同的Scope，則此範圍必須是@Singleton的子組件。

假設你有ApplicationComponent與@Singleton註釋：

@Singleton 
@Component(
     modules = ApplicationModule.class 
) 
public interface ApplicationComponent { 

    JobManagerComponent provide(JobManagerModule jobManagerModule); 
} 

ApplicationModule提供Context：

@Module 
public class ApplicationModule { 
    protected final Application mApplication; 

    public ApplicationModule(Application application) { 
     mApplication = application; 
    } 

    @Provides 
    @ApplicationContext 
    public Context provideApplicationContext() { 
     return mApplication; 
    } 
} 

通知書的，ApplicationComponent必須提供JobManagerComponent 和Context設有@ApplicationContext註解。

現在你創建JobManagerComponent作爲ApplicationComponent的@Subcomponent：

@UserScope 
@Subcomponent(
     modules = JobManagerModule.class 
) 
public interface JobManagerComponent{ 
} 

JobManagerModule：

@Module 
public class JobManagerModule 
{ 
    private static final String TAG = JobManagerModule.class.getSimpleName(); 

    @UserScope 
    @Provides 
    public JobManager providesJobManager(@ApplicationContext Context context) 
    { 
     Log.d(TAG, "Providing JobManager"); 
     final Configuration configuration = new Configuration.Builder(context).build(); 
     return new JobManager(configuration); 
    } 
} 

通知從@Module註釋和Context與@ApplicationContext

創作註釋去除：

JobManagerComponent jobComponent = DaggerApplicationComponent.builder() 
    .applicationModule(applicationModule) 
    .build() 
    .provide(new JobManagerModule());