Android—關於通知NotificationManager操作

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

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)
        }

我這裏創建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