Koin sharing instances between modules

问题

I'm using the Koin library for an Android project. I want to share some instances between modules since they are used a lot throughout the application. For instance:

val moduleA = module {
    scope(named<FragmentA>()) {
        scoped { FirebaseFirestore.getInstance() }

        scoped { LocalDatabase.getInstance(App.sContext) }
        scoped { NetworkDataSourceA(get()) }    
    }
}

val moduleB = module {
        scope(named<FragmentB>()) {
            scoped { FirebaseFirestore.getInstance() }

            scoped { LocalDatabase.getInstance(App.sContext) }
            scoped { NetworkDataSourceB(get()) }    
        }
    }

As we can see from the following modules the FirebaseFirestore.getInstance() and the LocalDatabase.getInstance(App.sContext) are the same between both modules. Is there a way where I can declare lets say a moduleC that contains FirebaseFirestore.getInstance() and the LocalDatabase.getInstance(App.sContext) and then call it on the moduleA and moduleB?

回答1:

• You can do this by creating scope. Though I didn't tried.

  val moduleA = module {
  scope(named("CommonScope")) {
  
  scoped { FirebaseFirestore.getInstance() }
  scoped { LocalDatabase.getInstance(App.sContext) }
  
  scoped { NetworkDataSourceA(get()) }   
  scoped { NetworkDataSourceB(get()) }  
  
    }
  }
  

• Now, create your scope in your FragmentA using below line.( also same for FragmentB for NetworkDataSourceB)

  private val commonScope = getKoin().getOrCreateScope("scope1",named("CommonScope"))
  val networkDataSourceA = commonScope.get<NetworkDataSourceA>()
  

• And In onDestroy method

  commonScope.close()
  

  For more detail check koin documentation (8th point)

来源：https://stackoverflow.com/questions/56721048/koin-sharing-instances-between-modules