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androidlistbackground-colorapp-inventortinydb

App Inventor choose background color from list in TinyDB

I am trying to make an app using App Inventor.

The app has more functions, but I am stuck at the I would say "basic" one. What I want to do is basically change the background color (or color of any element) by calling the color from list stored in TinyDB.

I have two screens Screen1 and a Menu screen. I am tring to call TinyDB while Screen1 initializes and set background color of app on the first in the list. Further I want to let user to choose a color from list on the other screen "Menu". After picking a color change the color on both screens.

I tried to make it following the instruction https://sites.google.com/site/blocks123/playing-with-colors , but it is little bit confusing for me.

On the printscreen i have the TinyDB blocks on the Screen1. Is it possible on Screen1 just call/initialize TinyDB but has the TinyDB blocks on other screen "Menu"?

And when I have TinyDB and lists of color how to change the color on the chosen one?

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Thank you Taifun. Your tutorial was helpful for me, evethought it is bit confusing with variables which aren´t described there. Anyway I tried to do it a bit on my way and I think I am going the right direction. As it shown on second image I made it on the "Menu" screen and trying to save my choice to [TinyDB]. It works almost fine but except the error when "Menu" screen inicialize. I don´t understand why I am getting this message while to value is in the list? And the other way how to pass the BCurrentColor variable to "Screen1"? If I use set.Screen1.BackgroundColor it doesntWork

enter image description here

Well now I know I am close, I can almost fell it in the air. It is properly change background color on "Menu" screen but some how it doesn´t saves the choice to [TinyDB] as I describes at comments. Where I went wrong? I hope when I save the color "code" to database I can call it on the other screen.

enter image description here

Solution

  • As Taifun mentioned the problem was with the variables BCurrentColor and BCurrentColorName. After I changed them to values and the trigger after selecting color from list sets it to required color.

    Then I can call it from TinyDB. It works fine.