我有一个重试策略，它接受一个 lambda，启动一个 CoroutineScope ，增加重试计数器，检查是否达到最大重试次数，计算 waitTime根据重试次数，延迟这次的作用域，最后调用 lambda:
fun connectionRetryPolicy(block: () -> Unit) {
Timber.d("connectionRetryPolicy: called")
// Launch the coroutine to wait for a specific delay
val scope = CoroutineScope(Job() + Dispatchers.Main)
scope.launch {
// Get and increment the current retry counter
val counter = retryCounter.getAndIncrement()
// Check if the counter is smaller than the maximum retry count and if so, wait a bit and execute the given function
if (counter < maxRetry) {
// Calculate the time to be waited
val waitTime: Long = (2f.pow(counter) * baseDelayMillis).toLong()
// Delay the scope for the calculated time
delay(waitTime)
// Execute the given function
block()
}
// Else, throw an exception
else {
throw FirebaseNetworkException("Retry count reached")
}
}
}
调用此方法以递归调用挂起函数作为 lambda，如下所示:
private suspend fun connectToGooglePlayBillingService(): BillingResult? {
Timber.d("connectToGooglePlayBillingService: called")
return suspendCoroutine { continuation ->
// If the billingClient is not already ready, start the connection
if (!playStoreBillingClient.isReady) {
// Start the connection and wait for its result in the listener
playStoreBillingClient.startConnection(object: BillingClientStateListener {
override fun onBillingServiceDisconnected() {
Timber.d("onBillingServiceDisconnected: called")
// Retry to connect using the RetryPolicies
RetryPolicies.connectionRetryPolicy { connectToGooglePlayBillingService() }
}
override fun onBillingSetupFinished(billingResult: BillingResult?) {
// There is code that does not matter here
}
})
}
}
}
现在，Lint 告诉我，
connectToGooglePlayBillingService不能在 lambda 内部调用，因为它是一个挂起函数，需要在 CoroutineScope 内部调用.如您所见，我确实将 lambda 称为 CoroutineScope在 connectionRetryPolicy .这是 Lint 中的错误还是我在这里做错了什么？我知道，我可以新建一个
CoroutineScope在 lambda 中，然后调用 connectToGooglePlayBillingService关于性能，我不确定这是否明智。
最佳答案
代替
fun connectionRetryPolicy(block: () -> Unit)
和
fun connectionRetryPolicy(block: suspend () -> Unit)
因为您的
block()将在协程内运行，但其他方法不知道。
关于android - 为什么在 CoroutineScope 内的 lambda 中调用挂起函数会产生错误？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/62060646/