挂起函数“callGetApi"只能从协程或其他挂起函数调用 [英] Suspend function 'callGetApi' should be called only from a coroutine or another suspend function
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问题描述
我正在从 onCreate(...) 调用挂起的函数
I am calling suspended function from onCreate(...)
override fun onCreate(savedInstanceState: Bundle?) {
...
...
callGetApi()
}
和暂停的功能是:-
suspend fun callGetApi() {....}
但是出现了错误挂起函数'callGetApi'应该只从协程或其他挂起函数调用
推荐答案
挂起函数只能从协程中调用.这意味着您需要使用协程构建器,例如启动
.例如:
Suspend function should be called only from coroutine. That means you need to use a coroutine builder, e.g. launch
. For example:
class Activity : AppCompatActivity(), CoroutineScope {
private var job: Job = Job()
override val coroutineContext: CoroutineContext
get() = Dispatchers.Main + job
override fun onDestroy() {
super.onDestroy()
job.cancel()
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
launch {
val result = callGetApi()
onResult(result) // onResult is called on the main thread
}
}
suspend fun callGetApi(): String {...}
fun onResult(result: String) {...}
}
要在 Android 中使用 Dispatchers.Main
,向应用程序的 build.gradle
文件添加依赖项:
To use Dispatchers.Main
in Android add dependency to the app's build.gradle
file:
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1'
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