Help! I need to transfer a value of a checkbox from screen to another

MIT App Inventor Help
#1

Hello there, First of all i would like to thank all helpers who would help me in the situation. So, First i wanted to create a artificial app which is like your normal fast-food delivery app...
The thing is that i am not able to transfer a checkbox value from one screen to another...
Even the Firebase Database can't help as it clears all the values and resets the whole program.

So, I need a help on what should i do. Can anyone help me?

#2

Hi. Some hints.

  1. Are you sure you need another screen ? You can also play with arrangements and set them visible true or false . It's like a change of screens without create any screens.
  2. Look about the component TinyDb , it's a local Db where you can save data and retrieve data with tag and values. You need to add this component in every screens you need . Ps If user changes device or deletes app memory he will lost all the data.
  3. simply use the block open another screen with value
    (Control blocks)
#4

Can you please tell me how to retrieve data from TinyDB as I am able to save it but rather not retrieve it. (On large Scale)

#5

There is a block to save and another to get value , the value has to saved under a tag .

#6

image
This one?

This one has a problem as I want to add multiple options and if it chose one which the User didn't wanted, how may i be able to fix it.

Also should I show my code so that you could get a better understanding of my probblem.

@Raffaele_Gold Please help.

1 Like
#7

Is there any solution to this problem.

Please help if anybody can.

#8

Can you please elaborate?

Yes..

#9

blocks (1)
blocks (1)2507×804 331 KB

Multiple info needed to be added.

#10

You have to explain better your goal. Probably you have to work with list or some variable to store the data in the right way . A list of products , their prices, a final cart to pay . Now I don't understand which is your request :sweat_smile:
But I know that store a single value under a tag isn't the right way and probably there is a better one to manage data comfortable.

#11

Ps. If you use TinyDb you don't need to pass values between screens but just add the tinyDb component in all the screen and use the get block to retrive the tag

#12

You don't need a component for every menu item.

Learn to use lists and list pickers.

Sample:

1 Like
#13

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