1.發(fā)送通知

        //1.獲取通知管理器類
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        /**
         * 兼容Android版本8.0系統(tǒng)
         */
        String channeId = "1";
        String channelName = "default";
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(channeId, channelName, NotificationManager.IMPORTANCE_DEFAULT);
            channel.enableLights(true);         // 開啟指示燈，如果設(shè)備有的話
            channel.setLightColor(Color.RED);   // 設(shè)置指示燈顏色
            channel.setShowBadge(true);         // 檢測是否顯示角標(biāo)
            notificationManager.createNotificationChannel(channel);
        }
        //2.構(gòu)建通知類
        NotificationCompat.Builder builder = new NotificationCompat.Builder(Main2Activity.this, "1");
        builder.setSmallIcon(R.mipmap.ic_launcher);//設(shè)置小圖標(biāo)
        builder.setContentTitle("微信");//標(biāo)題
        builder.setContentText("您有一條未讀消息!");//內(nèi)容
        builder.setWhen(System.currentTimeMillis());    //時(shí)間

        //3.獲取通知
        Notification notification = builder.build();

        //4.發(fā)送通知
        notificationManager.notify(100, notification);

2.取消通知

        //取消通知
       NotificationManager service = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
       service.cancel(100);