Android Question Saving database after uninstalling application

latietude · Mar 19, 2025

Hello everyone, I think many of you have been unable to recover the database data entered before uninstalling the application.

Does anyone know how to do it for fun? I tried to enter some codes found on other forums but I could not find the solution.

I enclose a small test project, thank you in advance.

latietude · Mar 19, 2025

latietude said:
Hello everyone, I think many of you have been unable to recover the database data entered before uninstalling the application.

Does anyone know how to do it for fun? I tried to enter some codes found on other forums but I could not find the solution.

I enclose a small test project, thank you in advance.

<Does anyone know how to do it for fun?>
I apologize because the translator changed "please" to "fun"
Thank you

Brian Dean · Mar 19, 2025

You missed out one important line of code. I have added it.

latietude · Mar 19, 2025

Brian Dean said:
You missed out one important line of code. I have added it.

Thank you for the correction but my problem is to be able to resume database data after reinstalling the application.

latietude · Mar 19, 2025

latietude said:
Thank you for the correction but my problem is to be able to resume database data after reinstalling the application.

I’ll explain better, the example application works well if I keep it installed on my phone: every time I restart it the counter resumes from the total number of clicks that I made the previous time. The problem occurs when I uninstall the application because when I reinstall it again the counter, instead of resuming from the total number of clicks made, resets.

I would not lose the data and that when I reinstall it made me resume from where I had arrived before the uninstallation..... if possible.

Brian Dean · Mar 19, 2025

Is your question about saving data between sessions or retrieving data after uninstalling the app?

latietude · Mar 19, 2025

Brian Dean said:
La tua domanda riguarda il salvataggio dei dati tra le sessioni o il recupero dei dati dopo la disinstallazione dell'app?

After uninstallation

Brian Dean · Mar 19, 2025

Sorry - I misunderstood your original question, and then our posts crossed each other. In my opinion the only sensible way to preserve data between installations is to use cloud storage, and that usually also requires some form of user registration. If you want to save data on the device then you need user assistance before they decide to uninstall, and they need to be knowlegeable about where it is stored and how to retrieve it after they have reinstalled the app. This post explains the procedure, but it is not in my opinion very satisfactory for the use you have in mind.

latietude · Mar 19, 2025

Brian Dean said:
Sorry - I misunderstood your original question, and then our posts crossed each other. In my opinion the only sensible way to preserve data between installations is to use cloud storage, and that usually also requires some form of user registration. If you want to save data on the device then you need user assistance before they decide to uninstall, and they need to be knowlegeable about where it is stored and how to retrieve it after they have reinstalled the app. This post explains the procedure, but it is not in my opinion very satisfactory for the use you have in mind.

Thank you very much, it’s not exactly the solution I expected to find but at least now I can work on something concrete

Brian Dean · Mar 19, 2025

Things have been this way for some time. You might find this post useful - it contains a link to this page which offers more practical advice.

latietude · Mar 19, 2025

Brian Dean said:
Le cose sono andate così da un po' di tempo. Potresti trovare utile questo post : contiene un link a questa pagina che offre consigli più pratici.

Grazie ancora, sembra che non ci sia più un modo per decidere nel codice dove e come usare i dati inseriti. Cercherò di lavorare sul codice nell'esempio che mi hai inviato.

DonManfred · Mar 20, 2025

Check this. This is the only thing that you can use i guess.

Back up user data with Auto Backup | Identity | Android Developers

developer.android.com

I mean beside the use of a cloudstorage for your userdata as pointed out by @Brian Dean . This requires you to have an online-service running to handle this.

Inform about jRDC2, a B4J Serverapp which you could use to have an Online Onlinedatabases like MySQL instead of a Sqlite-Database on the Device.
The app should have access to internet to use jRDC2 for sure.

jRDC2: https://www.b4x.com/android/forum/t...ation-of-rdc-remote-database-connector.61801/

latietude · Mar 20, 2025

DonManfred said:
Controlla qui. Questa è l'unica cosa che puoi usare, credo.

https://developer.android.com/identity/data/autobackup?hl=it
Voglio dire, oltre all'uso di un cloud storage per i tuoi dati utente come sottolineato da @Brian Dean . Questo richiede che tu abbia un servizio online in esecuzione per gestirlo.

Informazioni su jRDC2, un'applicazione server B4J che puoi utilizzare per avere un database online come MySQL invece di un database SQLite sul dispositivo.
Per poter utilizzare jRDC2, l'app deve sicuramente avere accesso a Internet.

jRDC2: https://www.b4x.com/android/forum/t...ation-of-rdc-remote-database-connector.61801/

Thank you

vmag · Mar 24, 2025

There are no problems at all.
1. Figure out what is considered data for you (this is a database file, possibly several files).
2.Make it possible to copy this data to the phone folder that is available to you and make it possible to copy it back to the application directory.
3.Check the functionality of saving and restoring data by making changes. Now you can save the data, delete the application, install the application and restore the data, everything will remain as it was before the application was deleted.
You are most likely using SQLite storage without disabling the storage copy option., therefore, it is not the working database that is being copied, but it is unclear what...

latietude · Mar 24, 2025

vmag said:
Non ci sono problemi di alcun tipo.
1. Scopri cosa per te è considerato un dato (un file di database, forse più file).
2. Rendi possibile copiare questi dati nella cartella del telefono a tua disposizione e rendi possibile copiarli nuovamente nella directory dell'applicazione.
3.Controlla la funzionalità di salvataggio e ripristino dei dati apportando modifiche. Ora puoi salvare i dati, eliminare l'applicazione, installare l'applicazione e ripristinare i dati, tutto rimarrà come era prima che l'applicazione venisse eliminata.
Molto probabilmente stai utilizzando l'archiviazione SQLite senza disabilitare l'opzione di copia dell'archiviazione, quindi non è il database di lavoro che viene copiato, ma non è chiaro cosa...

Salve! Grazie per l'interesse dimostrato per il mio problema, ma forse a causa del traduttore non ho capito il tuo consiglio. Potresti spiegarmelo?

vmag · Mar 24, 2025

B4X:

Main.SQL1.ExecQuerySingleResult("PRAGMA journal_mode = delete")

An alternative for File.DirRootExternal ?

Hello. On newer versions of android, where you need to save a backup copy of SQLite instead of File.DirRootExternal ?

www.b4x.com

latietude · Mar 25, 2025

vmag said:
B4X:

Main.SQL1.ExecQuerySingleResult("PRAGMA journal_mode = delete")

An alternative for File.DirRootExternal ?

Hello. On newer versions of android, where you need to save a backup copy of SQLite instead of File.DirRootExternal ?

www.b4x.com

Thank you but unfortunately it does not work either, every time I reinstall the application the counter returns to zero. is like overwriting the database every time I reinstall the app...

latietude · Mar 25, 2025

latietude said:
Thank you but unfortunately it does not work either, every time I reinstall the application the counter returns to zero. is like overwriting the database every time I reinstall the app...

I’ve been trying since this morning and can’t get your code line to work so I ask you: have you tried to see if it works in the example project that I attached in post #3? Thank you for your interest in my problem which is driving me crazy.

vmag · Mar 25, 2025

latietude said:
Thank you but unfortunately it does not work either, every time I reinstall the application the counter returns to zero. is like overwriting the database every time I reinstall the app...

1. You need to save all the necessary data to the external available memory.
2. Check the contents of what you have saved (data, counters, etc.) on the computer.
3. Reinstall the application.
4. Restore the data.
Why doesn't it work:
1. You did not check item 2.
2. Before copying and restoring, delete the old destination files.
3. You don't handle errors.

latietude · Mar 29, 2025

vmag said:
1. You need to save all the necessary data to the external available memory.
2. Check the contents of what you have saved (data, counters, etc.) on the computer.
3. Reinstall the application.
4. Restore the data.
Why doesn't it work:
1. You did not check item 2.
2. Before copying and restoring, delete the old destination files.
3. You don't handle errors.

I tried your advice but I can’t get what I want. Every time I uninstall the app my counter is reset, I found that Google no longer allows to read the content of files inserted in DirRootExternal and it’s a great pity since, connecting the phone to the pc, I could see the increase of the counter from the app.

I’m not a professional programmer and I definitely miss something, do you have any other tips that can help me please?

Thank you again for your attention.

Android Question Saving database after uninstalling application

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