我有一个AsyncTask
在 Kotlin 中实现的子类:
class SignUpTask(responseHandler: SignUpTaskResponseHandler): AsyncTask<Agent, Void, Boolean>() {
override fun doInBackground(vararg params: Agent?): Boolean {
// Some awesome code
return true
}
override fun onPostExecute(result: Boolean?) {
result?.let {
if (it) {
responseHandler.agentCreationSucceeded()
} else {
// agent creation failed
}
}
}
}
问题是 - 我在这一行遇到错误responseHandler.agentCreationSucceeded()
:
未解决的参考:responseHandler
我可以通过显式声明一个属性并为其分配在构造函数中传递的参数来使其工作:
class SignUpTask(responseHandler: SignUpTaskResponseHandler): AsyncTask<Agent, Void, Boolean>() {
val internalResponseHandler = responseHandler // explicit assignment to make it work inside onPostExecute
override fun doInBackground(vararg params: Agent?): Boolean {
// Some awesome code
return true
}
override fun onPostExecute(result: Boolean?) {
result?.let {
if (it) {
// Works only after explicit assignment?
internalResponseHandler.agentCreationSucceeded()
} else {
// agent creation failed
}
}
}
}
关于为什么会产生这种开销的任何想法,或者我在这里遗漏了什么?