java - 是否需要检查通知 channel 是否已创建？

Question

在创建通知 channel 之前我们是否需要检查它是否尚未创建？

 private fun createChannel() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        // todo: add here check if channel is already created
        val defaultChannel = NotificationChannel(MEDIA_UPLOAD_NOTIFICATION_CHANNEL_ID, MEDIA_UPLOAD_NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH)
        defaultChannel.description = MEDIA_UPLOAD_NOTIFICATION_CHANNEL_DESC
        defaultChannel.enableVibration(true)
        notificationManager.createNotificationChannel(defaultChannel)
    }
}

Answer 1

不，您实际上不必检查这一点。如果存在具有相同 ID 的 channel ，则 Android 不会创建另一个 channel 。

根据文档

Creating an existing notification channel with its original values performs no operation, so it's safe to call this code when starting an app.

更多信息请访问 https://developer.android.com/training/notify-user/channels#CreateChannel