Android: Save File Permanently (Even After Clear Data/Uninstall)

Android: Save file permanently (even after clear data / uninstall)

You shouldn't do that, you shouldn't force the users to keep data on their phones without their consent.

Anyway, application data directory will be deleted after uninstall, but NOT after an update

The only way to have persistent data is to use the SD card, but again, users won't like to have the data on their card after the app is uninstalled

Or you can consider:

1. Storing the data on a remote server with some kind of authentication to retrieve it
2. Using Data Backup service

Android, Saving data that won't be deleted even after I uninstall the app

You can save data to external storage, and encrypt it using a key only your app knows. Keep in mind this would not be entirely safe, as a malicious app could get the key from your apk beforehand and use it to decrypt the data.

Data save for an android app after it uninstall or force data clear from settings

Variation of 4.
using Google's backup servers, however the user can delete the data through his system settings.

How to store data that remains after uninstall

The databases made by your app will be stored in /data/data/your.package.name/databases/ and will be deleted on uninstallation of the app.

So, that's not a solution. I think the only way would be using the SD-card.

Is it possible to persisit a file after app uninstall with Android 11?

If the file already exists and not trying to create the file at the time of being uninstalled your options are limited and not really good.

There is no way to keep a file around without user interaction. Your only option is really to use the Storage Access Framework to save the file. What happens here is you have to have the user pick where they want to save the file via file picker intent. Get the uri path in onActivityResult and use that to save the file.

Aside from requiring user intervention this also puts your file that has the licensing information in a publicly accessible location where anyone can get it which might not be something you want

That's really your only option if you want to keep a file around after your app has been uninstalled.

An Android app remembers its data after uninstall and reinstall

It's because Android 6 has automatic backup. You need to tune android:allowBackup and android:fullBackupContent in your manifest <application> tag if you don't want your data backed up or if you want to include or exclude some resources. It's not a bug.

More about AutoBackup on Android here.

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