Error en ListView de 'Registrar_Pedido': duplicación y desaparición de ítems con Rol 'Pedido"

MIT App Inventor Help
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1

Hi, I need help with this exercise I’m working on. It’s a "Registrar_Pedido" that should create an order with different data, but in the end it has a "Rol"* which would be "Pedido". My idea was that, since there are many screens in my project and each one has its own "Rol", the total roles would be "Pedido", "Evidencia", and "Reclamo". But right now I’m on the first one, which is "Pedidos", and this is how far I’ve gotten.

Now the problem is that ListView1 is not displaying, and also, when I delete one item with the "Rol" "Pedido", it no longer shows any elements in the ListView. In addition, when I click on an item, it gets duplicated. Please, I really need help.

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2

Don't use numbers (integers) for your sub tags, use alpha-numeric sub tags, e.g. 001,002,003. Firebase and the Firebase component get confused if you use numbers.

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It may be easier to call back all the data under a sub tag in one go, then handles the json returned to display your listview - you may want to use YAML for your display ?

3

Sorry, I'm still starting out with MIT APP INVENTOR for a university course. Could you please explain in more detail?

4

I provided links above that give you the detail, for this issues/suggestions I raised. Is there something else that you need explaining?