自定义Notification遇到的坑

自定义Notification 实现：

// RemoteViews for notification
private var rv: RemoteViews? = null
private var rvExpanded: RemoteViews? = null
private fun customNotification(process: Int) {
  // custom RemoteViews
  if (rv == null) rv = RemoteViews(packageName, R.layout.notification_small)
  rv?.setTextViewText(R.id.notification_title, "这是一个小标题")
  if (rvExpanded == null) rvExpanded = RemoteViews(packageName, R.layout.notification_large)
  rvExpanded?.setTextViewText(R.id.large_notification_title, "这是一个大标题，支持很多的内容: $process%")

  // PendingIntent
  val intentNotification = Intent(this, PlayMusicActivity::class.java).apply {
    flags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_SINGLE_TOP
  }
  val pendIntent = PendingIntent.getActivity(
    this,
    0,
    intentNotification,
    PendingIntent.FLAG_UPDATE_CURRENT
  )

  // build notification
  val customNotification =
  NotificationCompat.Builder(applicationContext, CHANNEL_ID)
  .setSmallIcon(R.drawable.bravo) // small Icon
  .setStyle(NotificationCompat.DecoratedCustomViewStyle()) // 自定义contentView
  .setCustomContentView(rv!!)
  .setContent(rvExpanded!!)
  .setCustomBigContentView(rvExpanded!!)
  .setCustomHeadsUpContentView(rvExpanded!!)
  .setOngoing(true) // 一直显示
  .setAutoCancel(false) // 点击后消失
  .setVisibility(NotificationCompat.VISIBILITY_PUBLIC) // 锁屏显示,需要配合权限设置
  .setPriority(NotificationCompat.PRIORITY_HIGH) // Priority
  .setOnlyAlertOnce(true) // 声音，震动，仅弹出一次
  .setContentIntent(pendIntent)
  .build()
  startForeground(NOTIFICATION_ID, customNotification)
}

1.使用 NotificationCompat 兼容各个版本差异性

2.RemoteViews 布局文件不支持 constraintlayout ，切记

3.在SDK 26之后必须要绑定Channel，所以通知要先创建Channel

fun checkAndCreateChannel(
  context: Context,
  channelId: String,
  channelName: String,
  desc: String = channelName
) {
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    val notificationManager: NotificationManager =
    context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    try {
      // 查找分组
      val nc = notificationManager.getNotificationChannel(channelId)
      Log.d("ChannelHelper", "${nc.id} Notification Channel exist.")
    } catch (e: Exception) {
      Log.d("ChannelHelper", "empty channel need create.")
      // 创建分组
      val mChannel =
      NotificationChannel(
        channelId,
        channelName,
        NotificationManager.IMPORTANCE_HIGH
      ).apply {
        description = desc
        enableLights(true)
        enableVibration(true)
      }
      notificationManager.createNotificationChannel(mChannel)
    }
  }
}