Android8.0引入NotificationChannel，每條通知都有對應的渠道，渠道創建后不可更改

1.要用到通知功能必不可少就是獲取一個NotificationManager對象

val manager= getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

2.創建自己所需要的渠道

if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.O){al channel1 = NotificationChannel("channel1","通知測試1",NotificationManager.IMPORTANCE_MIN)val channel2 = NotificationChannel("channel2","通知測試2",NotificationManager.IMPORTANCE_LOW)val channel3 = NotificationChannel("channel3","通知測試3",NotificationManager.IMPORTANCE_DEFAULT)val channel4 = NotificationChannel("channel4","通知測試4",NotificationManager.IMPORTANCE_HIGH)manager.apply {createNotificationChannel(channel1)createNotificationChannel(channel2)createNotificationChannel(channel3)createNotificationChannel(channel4)} }

創建4個渠道，對應通知4中重要程度

3.創建PendingIntent對象，點擊通知打開你所要顯示的界面

val intent = Intent(this,First::class.java) val pi = PendingIntent.getActivity(this,0,intent,0)

4.創建通知

btn1.setOnClickListener {val notification1 = NotificationCompat.Builder(this,"channel1").setContentTitle("測試通知1").setContentText("通知1來了，通知1來了，通知1來了").setSmallIcon(R.drawable.touxiang).setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.b)).build()manager.notify(1,notification1)}btn2.setOnClickListener {val notification2 = NotificationCompat.Builder(this,"channel2").setContentTitle("測試通知2").setContentText("通知2來了，通知2來了，通知2來了").setSmallIcon(R.drawable.c).setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.huangqiong)).build()manager.notify(2,notification2)}btn3.setOnClickListener {val notification3 = NotificationCompat.Builder(this,"channel3").setContentTitle("測試通知3").setContentText("通知3來了，通知3來了，通知3來了").setSmallIcon(R.drawable.leimu).setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.linlin)).build()manager.notify(3,notification3)}btn4.setOnClickListener {val notification4 = NotificationCompat.Builder(this,"channel4").setContentTitle("測試通知4").setContentText("通知4來了，通知4來了，通知4來了").setSmallIcon(R.drawable.liuyuan).setStyle(NotificationCompat.BigPictureStyle().bigPicture(BitmapFactory.decodeResource(getResources(),R.drawable.yating))).setContentIntent(pi).setAutoCancel(true).build()manager.notify(4,notification4)}

我這里創建4個按鈕事件分別對應4個通知，4個通知對應不同的4個渠道。

可以看到通知4在最前面。且通知3、4來的時候手機會有提示音，通知4相比3會彈出通知窗口

總結

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