弹出通知及跳转

      //获取通知管理器对象
       NotificationManager  notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

       // 8.0渠道     也可以写大于等于26
        if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.O){

            NotificationChannel notificationChannel = new NotificationChannel("id", "name", NotificationManager.IMPORTANCE_DEFAULT);
			//这三条不是很重要
            notificationChannel.setLightColor(Color.RED);     //设置指示灯颜色
            notificationChannel.enableLights(true);     //开启指示灯
            notificationChannel.setShowBadge(true);    //检测是否显示角标

            // 管理器创建  通知渠道对象
            notificationManager.createNotificationChannel(notificationChannel);

        }

        Intent intent = new Intent(MainActivity.this, TestActivity.class);
        PendingIntent activity = PendingIntent.getActivity(this, 100, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        // notification

        Notification build = new NotificationCompat.Builder(this, "id")
                // 三要素   缺一不可
                .setSmallIcon(R.drawable.bg_error)   //设置小图标
                .setContentTitle("TITLE")           //设置标题
                .setContentText("content")    //设置内容
                .setContentIntent(activity)    //点击通知跳转
                .build();


        notificationManager.notify(100,build);

本文地址：https://blog.csdn.net/qq_46237697/article/details/107522017