在哪里放置警报箱？
我有一个使用烧瓶作为后端的颤音应用程序，当后端有一些数据更改时，我想向用户发送一个警报对话框。尽管我知道如何使用警报框，但我很困惑应该放置该代码的位置，因为我使用3个屏幕并通过pageview导航。
我的用例是，我有一个配备了PIR传感器到Raspberry Pi上，并且当检测到运动时，Motion_Status值将变为true，并通过Blask应用程序发送到Flutter App。
我对需要放置“警报”对话框小部件的位置感到困惑，以便无论我在哪个屏幕上都会获得警报框。
I have a flutter app that uses flask as backend and when ever some data changes in the backend, I want to send an Alert Dialog to user. Although I know how to use Alert Box, I'm confused where the code for it should be placed as I'm using 3 screens and navigating then via PageView.
My use case is that I have a PIR sensor equipped onto a raspberry pi and when ever motion is detected, motion_status value turns to true and sends to flutter app via flask app.
I'm confused about where i need to place the Alert Dialog widget so that when ever movement happens, no matter what screen i'm in i should get alert box .
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因此，当后端发生更新时，您有几种不同的方法来获取有关更改的通知的应用程序，
1-首先，您会在flutter应用程序中创建一个tream，请呼叫服务器以检查是否发生了任何更改，该流式流程重新占有每一个几分钟或几秒钟，但这不是一个好的解决方案，因为将有很多电话到服务器的电话，并且信息不会瞬间。
2-使用Web插座系统
最佳解决方案
3-使用FCM Firebase Cloud Messaging System，每当后端发生更改时，您都会编写一个代码，该代码调用与Flutter App关联的Firebase帐户，您的Firebase帐户将将带有数据加载的通知发送到您的应用程序，当您的应用接收到实时通知时，您可以向用户显示警报对话框
So when an update happen in the backend, you have couple different ways to get the app notified about the change just happened,
1- first you create a stream in the flutter app calling the server to check if any change happened, that stream reoccurs every few minutes or seconds, but that's not a good solution because there will be a lot of calls to the server and the info won't be instant.
2- use a web socket system
Best solution
3- use FCM Firebase cloud messaging system, whenever a change happened in the backend you write a code that calls Firebase account associated with your flutter app and your Firebase account will send a notification with data load to your app, when your app receives that real time notification you can then show to the user the alert dialog