android - Unresolved 引用 createNotificationChannel()

Question

我尝试创建一个“O”通知机制。所以我遵循了 Android 文档的解释。

我首先在我的 gradle 文件中添加了正确的库:

dependencies {
    implementation "com.android.support:support-compat:27.0.2"
}

然后我写了下面的代码:

private var notification: NotificationCompat? = null

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        // Create the NotificationChannel, but only on API 26+ because
        // the NotificationChannel class is new and not in the support library
        val name = getString(R.string.channel_name)
        val description = getString(R.string.channel_description)
        val importance = NotificationManager.IMPORTANCE_DEFAULT
        val channel = NotificationChannel(PrinterApplication.CHANNEL_ID, name, importance)
        channel.description = description
        // Register the channel with the system
        val notificationManager = NotificationManagerCompat.from(this)
        notificationManager.createNotificationChannel(channel)
        notification = NotificationCompat.Builder(this, channel.id)
            .setSmallIcon(R.drawable.print)
            .setContentTitle(resources.getString(R.string.app_name))
            .setContentText(resources.getString(R.string.print_service_running))
            .build()
    } else {
        ...
    }

因此 AS3 报告了以下问题:

Unresolved reference: createNotificationChannel(channel)
Type Mismatch: required: NotificationCompat? found: Notification!

请问是什么问题？

Answer 1

我能够摆脱 Unresolved reference: createNotificationChannel

通过像这样声明 notificationManager:

val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) 作为 NotificationManager

和 build() 返回一个 Notification 对象，而不是 NotificationCompat。

Context.getSystemService

build