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[英]how to inject dependency outside activity or fragment in Kodein or Koin?
[英]How to inject activity context in modules with koin dependency library
我有一個 Util 模塊,如下所示,它需要活動上下文 [不是應用程序上下文] 來完成它的一些功能。
如何將活動上下文注入其中?
class MainPresenter internal constructor(private val iMainActivity: IActivity) : IPresenter {
//dependencies
private val context = iMainActivity as AppCompatActivity
private var util = UtilModule(context) //<-- inject this
private var httpClient = HttpClient(context) //<-- inject this
在這種情況下,正如@commonsware所說,presenter 類依賴於活動並不好。 使用注入更好的解決方案可以是如下結構:
class IActivity{
private val utilModule: UtilModule by lazy { UtilModule(this@IActivity) }
private val httpClient: HttpClient by lazy { HttpClient(this@IActivity) }
private val presenter: MainPresenter by inject{ parametersOf(utilModel,
httpClient) }
}
class MainPresenter(private val util: UtilModule, private val httpClient: HttpClient)
您的模塊:
single { MainPresenter( it[0], it[1] ) }
您可以使用 koin 生命周期擴展將活動/片段實例動態附加到范圍實例注冊表中。
val definition = BeanDefinition(
scopeDefinition = this._scopeDefinition,
primaryType = T::class,
kind = Kind.Single,
definition = { instance() }
)
val instanceMap = lifecycleScope._instanceRegistry.instances as HashMap<IndexKey, InstanceFactory<*>>
val factory = SingleInstanceFactory(this._koin, definition)
instanceMap[indexKey(T::class, null)] = factory
然后將其注入范圍定義:
scope<SomeActivity> {
// inject activity with Scope.get()
scoped { SomeModule(get()) }
}
最后,注入lifecycleScope:
val someModule: SomeModule by lifecycleScope.inject()
我寫了一個演示來解釋它是如何工作的: https : //github.com/twiceyuan/KoinAndroidComponentInject
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