Sending Data between Screens

[Mage Justice]

Hi all,

I am having some trouble sending multiple data between different screens.

I created a system to encode a string of data and then extract it on another screen when it opens, but it doesn't seem to be working and I have no idea why. The system works by adding spaces to the variables so that all variables are exactly 10 characters long. The program then extracts 10 character sections of the data, trims the extra spaces, and then we have the raw variables. I do this because I can only send one starting value, so I am trying to cram as much into that starting value as possible, as I need a lot of data to transfer.

I have attached the code between the two screens, does anyone know why this is not working?

Also, if I were to initialize a variable, and also set this variable as something else when a screen opens, will that screen display the original value of the variable or the new value? I heard somewhere that  App Inventor does these starting processes in a random order. Is this true? Is there any way to get around this? Any other ideas?

Thanks so much

Mage Justice

[TimAI2]

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

If you haven't done it already....

Read:  The FAQ  TUTORIALS  USING IMAGES  BLOCKS  COMPONENTS  EXTENSIONS  LISTS 

[Mage Justice]

Thanks for the quick reply.

Seems like a good idea. Is there a limit to how much storage a single screen can hold? I am probably going to be using a bunch of long sound files. In addition, is there a problem with the code I attached in my first post, in case I do decide to use other screens? And also the question with initial variables (see last post).

Thanks ,

Mage Justice

[TimAI2]

1. Suggest you do not store your long sound files "in the app", but download them to the sdcard on first use, or as required

https://puravidaapps.com/filebyfile.php

2. I refer you to my previous post, with regard to switching screens correctly

3. Also refer to previous post, but you would need a tinydb to save variable values which would then be available on other screens, you could also use this to change the blocks you have shown