作者:ayo | 来源:互联网 | 2023-01-20 07:13
我正在使用带有Dagger2的新架构组件,我想使用Factory类注入我的ViewModels.Factory类本身是可注射的.当在Java中定义Factory类时,这一切都很有效,但是当我将它转换为Kotlin时,Dagger2不知道如何为构造函数生成Map,而在Java中它知道如何这样做.我认为不同之处在于,转换后,Factory类使用kotlin包中的Map,而不是java.util.Map包.如何让Dagger2为Factory构造函数生成地图?
这是Factory类
@ActivityScope
class MainActivityViewModelFactory @Inject
constructor(private val creators: Map, Provider>) : ViewModelProvider.Factory {
override fun create(modelClass: Class): T {
var creator: Provider? = creators[modelClass]
if (creator == null) {
for ((key, value) in creators) {
if (modelClass.isAssignableFrom(key)) {
creator = value
break
}
}
}
if (creator == null) {
throw IllegalArgumentException("unknown model class " + modelClass)
}
try {
return creator.get() as T
} catch (e: Exception) {
throw RuntimeException(e)
}
}
}
这是错误
Error:java.util.Map,? extends javax.inject.Provider> cannot be provided without an @Provides-annotated method.
我尝试创建一个模块来提供地图,但这没有帮助.
@ActivityScope
@Module
class MapModule {
@Provides
fun provideMap(): Map, Provider> = mutableMapOf()
}
savepopulati..
14
我ViewModelFactory
稍微修改了你的代码:
@ActivityScope
class MainActivityViewModelFactory @Inject
constructor(private val creators: Map, @JvmSuppressWildcards Provider>) : ViewModelProvider.Factory {
override fun create(modelClass: Class): T {
var creator: Provider? = creators[modelClass]
if (creator == null) {
for ((key, value) in creators) {
if (modelClass.isAssignableFrom(key)) {
creator = value
break
}
}
}
if (creator == null) {
throw IllegalArgumentException("unknown model class " + modelClass)
}
try {
return creator.get() as T
} catch (e: Exception) {
throw RuntimeException(e)
}
}
}
你能尝试一下吗?我添加了@JvmSuppressWildcards
注释.
有关详细信息,请查看:https:
//kotlinlang.org/api/latest/jvm/stdlib/kotlin.jvm/-jvm-suppress-wildcards/index.html
编辑:你可以从我的回购中找到一个现场演示:https://github.com/savepopulation/dc-tracker
1> savepopulati..:
我ViewModelFactory
稍微修改了你的代码:
@ActivityScope
class MainActivityViewModelFactory @Inject
constructor(private val creators: Map, @JvmSuppressWildcards Provider>) : ViewModelProvider.Factory {
override fun create(modelClass: Class): T {
var creator: Provider? = creators[modelClass]
if (creator == null) {
for ((key, value) in creators) {
if (modelClass.isAssignableFrom(key)) {
creator = value
break
}
}
}
if (creator == null) {
throw IllegalArgumentException("unknown model class " + modelClass)
}
try {
return creator.get() as T
} catch (e: Exception) {
throw RuntimeException(e)
}
}
}
你能尝试一下吗?我添加了@JvmSuppressWildcards
注释.
有关详细信息,请查看:https:
//kotlinlang.org/api/latest/jvm/stdlib/kotlin.jvm/-jvm-suppress-wildcards/index.html
编辑:你可以从我的回购中找到一个现场演示:https://github.com/savepopulation/dc-tracker
你刚刚保存了脑细胞的数量