Dictionary type varibles is not able to pass between screens

[Krishgon]

I am currently working on an app, which I would be using for my own utility. The main point is that I am not able to pass dictionary between screens. Moreover, I am also not able to pass seperate values from a dictionary. I am attaching an ‘aia’ file. StockExchangeCompanion.aia (2.1 MB) . I am not able to pass between screen:‘playcard’ and screen:‘Ratesofshares’.

It would be a great pleasure if anyone could help or tell an alternative method.
Thanks,
Krish

[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

 

[ABG]

Could you tell us about your 2 TinyDBs with their separate namespaces?
One of them is named after a single stock, and the other has multiple stock prices.

[Krishgon]

Now, I have kept their namespaces same, but still not working. I just want to pass dictionary between screens. Can you tell me a way of it?

[ABG]

Before answering, I would need to understand the structure of your data.

What information to you keep about stocks (by name?) aside from their current prices?

[Krishgon]

This is an app for a board game named ‘stock exchange’ by zephyr. In the game, you have cards by which the prices of shares increase/decrease. I want to create a companion app, so that I can keep a record and check the rates of share.

I just want to keep their current price and their default prices in my datastructure. So, I created a dictionary for the same. But, I am not able to pass dictionary between screens (even with TinyDB), so I need an alternative method or a method to do so.

*Keeping dictionary’s and other screens in my program are essential

I am a 9th grade student and I am preparing for google code to learn contest. This app is for understanding algorithms and practice.

Thanks,
Krish

[ABG]

Study this sample app for tracking prices and purchases …

Fruit Stand

All you need is two Tinydb Namespaces.
You don’t need a dictionary for this.

[ewpatton]

Hmm. I don’t see any reason why dictionaries shouldn’t be passable from screen to screen, but I’ll take a look. One concern might be if the dictionary is cyclic, but I don’t think that’s true in this case.