Crash app multiscreen

[TIMAI2]

Start a new project

Place your Screen1 blocks and components in Screen1
For Screen2 just have a return button to Screen1

Does this crash ?

If not, it shows there is something in Screen2 causing the problem. it is diffcult to see from your screenshot what is actually present in Screen2

[S_M]

pressing the start button in screen 1 does not switch to screen 2 (procedure) but the app closes. In screen 2 i created a form where there are fields to fill in but no screen is displayed

[Taifun]

@S_M

the app closes

To find out why use logcat

Capturing Device Logs using adb logcat

ADB is a command-line utility that that can be used to control your device over USB from a computer. It will allow you to install / uninstall and or view logs on your device. This could be very handy when there are issues with a specific app and you like to view the logs for information that may lead to identify the cause of error. In this post, we’ll discuss how to install and use ADB. Installation: ADB comes with Android SDK. However, you can download ONLY the ADB files from HERE . Download…

Taifun

[ABG]

I wonder if naming a Screen 'procedure' is asking for trouble?

[TIMAI2]

Here is a test app. No crash when switching.

Also tests for a screen named procedure

twoscreencrash (1).aia (4.3 KB)

Does this still crash for you @S_M if you test ? If not, then you need to look at what you are doing in Screen2 procedura, there is something in there causing the crash.

[uskiara]

Ciao @S_M,
oltre all'aiuto che ti hanno già dato tutti gli altri , ti suggerirei di usare i virtual screen, come spiegato in questo tutorial:

General Tips and Tricks for App Inventor

This list was made by @Taifun 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... If you decided to use different screens, then you should switch them correctly, else you …

Elimini tutti i problemi legati al context switching tra schermi (passaggio di variabili apertura e chiusura di connessioni, accensione e spegnimento di timers, insomma un sacco di "grane").
E' semplicissimo e puoi avere tranquillamente 10 "schermi" che si sostituiscono tra di loro (anche >10, è solo un esempio). Puoi usare l'estensione "Phase" di @shreyash per applicare effetti di "fading" nello scambio di schermi, ed effetti di popup utilizzando l'estensione "Overlapview" di @Vsatish13.
Buon lavoro !

Eng:
in addition to the help give you by the others PU and users, I would suggest you to use virtual screens, as explained in the tutorial linked above.
With virtual screens, you will eliminate all the problems related to context switching between screens (passing variables, opening and closing connections, switching timers on and off, in short, a lot of "troubles").
It's very simple and you can even have 10 "screens" that replace each other (10 or more, it's just an example). Plus, you can use @shreyash's "Phase" extension to apply "fading" effects in screen swapping, and popup effects using @Vsatish13's "Overlapview" extension.
Good work !

[S_M]

this works fine, but on my project it keeps giving error. I will try to create a new project

[TIMAI2]

As I said, you need to look at what you are doing in Screen2 - procedura.

[S_M]

In screen2 (procedure) I have inserted a series of fields that can be pre-combined with textbox and spinner where the user can enter the answer or choose from the options entered by me in the spinner. So in the blocks I just inserted the field to make visible the entire vertical arrangement that contains all the fields I created. I hope I explained myself better. I enclose the blocks and the designer of the screen2

[S_M]

I found the error. Screen 2 does not open because in the 4 spinners I entered too many options in each one. What way can I use if in the spinner list I have to put a lot of items?

[TIMAI2]

How many options ? (for each spinner)

can they be categorised ? You could have sub lists and dependent spinners.

[TIMAI2]

@S_M

there are 8000 options

How will this be practical for any one to select an item - 4 spinners that is 2000 options in each! Users would just give up scrolling after two or three scrolls....

You need to find another method, probably using a database with search / filtering tools.

Android runs SQLite as a local database, and there are many options for an online db.

[ABG]

This sample doc and app shows how to present huge ordered lists in List Pickers and List Views:

Ordered Search and Lookup

[S_M]

Could you give me some advice on how to do it?

[TIMAI2]

@S_M

how to do it

[FREE] SimpleSqlite - an extension for working with SQLite Databases

This is a fork/rework/remix of Tom Bennedum's open-sourced aix-SQLite extension. (all Credits to Tom!) I have stripped it back to a bare-bones/expert version, without (hopefully) affecting functionality. The key to working with this extension/sqlite is: being clear about which database file and also which database you are working with remembering to OPEN the database to carry out data operations (SELECT etc) remembering to CLOSE the database to carry out file operations (IMPORT/EXPORT etc) t…

Revival - Italo's Custom Listview Filter Bar - with Clock

With all links to Italo's guide on the above lost from appyBuilder and Thunkable, I thought I would put up a remix of the original blocks, with an aia project example. This uses a clock timer instead of a textbox extension. The only change I have made is to add an extra conditional check: does the last textbox content equal the current textbox content (if so, do nothing), to cut down on unnecessary processing. This also ensures that listview selections above the last one can be made. Clock timer…

[S_M]

I created this block to be able to read the options that can be chosen from a csv file but I can't create a search bar for a faster selection (because there are 8000 elements) and store the chosen option in the textbox. Could you kindly help me? I attach .aia file and csv file

listcsv.aia (19.7 KB)
emdncode.csv (86.5 KB)

[Boban]

Try this one listcsv1.aia (19.7 KB)

Just changed the theme and used
in your ListPicker

[S_M]

thanks a lot but it doesn't store the value i select in the textbox. How can I solve the problem?

[TIMAI2]

Use the afterPicking event to set the selection to the textbox

[S_M]

Can you use listpicker or spinner to select options (including "other") and possibly open textbox if "other" option is selected and save it? Thanks a lot