Live data in list view ,how?

Bibin_Abraham · June 21, 2023, 8:49am

So,its for my project, my topic is smart surveillence in urban farming.its consits of sensors that sent live data to my firebase cloud which shows on my MIT app,but the problem is i need to show the data t in a list view of the like
Temperature reading1 :22 degree
Temperature reading2 :22.4 degree
Temperature reading3 :22.8 degree
and as the list must be updated whenever the cloud gets the data,i tried whatching all tutorials in youtube and all all those are not working because they show only constant data.i tried and failed miserabliy

,so these are the blocks and design of my first page,i dont know howto start on the live list view of the data in the second page ,if anyone can help me please do.

TIMAI2 · June 21, 2023, 10:18am

Each time you get new data, update your underlying list with that data then apply that data to you list iew elements

Kevinkun · June 21, 2023, 10:59am

I did not see any listView in your designer.

You are trying to display your data in a Label.
You can do this:
set Temp_val.Text to JOIN (value, '\n', Temp_val.Text)

Bibin_Abraham · June 21, 2023, 1:53pm

i know the idea but i am not able to put the concep tinto my designer blocks

Bibin_Abraham · June 21, 2023, 1:54pm

i dont know how to activate the listview,i dont understand the concept of it and how does it work.

TIMAI2 · June 21, 2023, 2:39pm

Do you actually need a listview, or do you simply need to display the latest values from Firebase in the textboxes you have on Screen1 ?

ABG · June 21, 2023, 3:03pm

Have you tried the AI2 Charts component?

It can be used to show readings over time.

Bibin_Abraham · June 23, 2023, 9:54pm

I want to see all my live temperature data on screen 2

this screen 1 diagram below
.
but it is not working, I got Firebase as my main database; as a result, I can see the data on screen 1, and it's real-time updating. I used Tempbase to store data from screen 1 and show the data on screen 2, but it is not working, and I need to see the data in a list manner. I do not know, but it is not working. someone, please help me with the block diagram.

TIMAI2 · June 23, 2023, 9:58pm

You have an empty socket, fill this with an empty text block.

You are not switching screens correctly

Use different screens wisely

Before starting to create another screen, first you should think about is it really necessary?
See also Building apps with many screens and SteveJG's post about advantages/disadvantages, because in only one screen you also can use vertical arrangements to simulate different screens, just set the arrangements to visible = true/false as needed...
See also Martyn_HK's example about how to use Tabs in App Inventor and another example from Cyd. and my Tabbed Screens Demo

If you decided to use different screens, then you should switch them correctly, else you will run out of memory after a while...
The recommended method of switching screens in App Inventor

(Thanks Taifun)

Also see demo: multiscreen.aia