kotlin实现通知栏提醒功能代码实例

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="vertical"
 xmlns:android="http://schemas.android.com/apk/res/android">
 <Button
  android:onClick="showNotification"
  android:text="显示通知"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"/>
</LinearLayout>

fun showNotification(view: View)
{
 // CHANNEL_ID：通道ID，可在类 MainActivity 外自定义。如：val CHANNEL_ID = 'msg_1'
 val builder = NotificationCompat.Builder(this, CHANNEL_ID)
  .setSmallIcon(R.mipmap.ic_launcher)
  .setContentTitle("RNG赛程提醒")
  .setContentText("今天晚上19:00，RNG对阵IG")
  // 通知优先级，可以设置为int型，范围-2至2
  .setPriority(NotificationCompat.PRIORITY_MAX )
 // 显示通知
 with(NotificationManagerCompat.from(this)) {
  notify(1, builder.build())
 }
}

private fun createNotificationChannel()
{
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
  val name = getString(R.string.channel_name)
  val descriptionText = getString(R.string.channel_description)
  // 提醒式通知(横幅显示)，不过大部分需要手动授权
  val importance = NotificationManager.IMPORTANCE_HIGH
  val channel = NotificationChannel(CHANNEL_ID, name, importance).apply {description = descriptionText}
  // 注册通道(频道)
  val notificationManager: NotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
  notificationManager.createNotificationChannel(channel)
 }
}