When an app is uninstalled, is the data in its SharedPreferences database deleted?
If not, without a device being rooted, is there any way to clear that data? (Or at least view it?)
asked Jun 12 '19 at 20:18
RockPaperLz- Mask it or CasketRockPaperLz- Mask it or Casket
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SharedPreferences is located in the data directory of the app which gets deleted during uninstallation. Do you have a case where it was not deleted by the system?– Firelord ♦Jun 12 '19 at 20:36
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@Firelord I was reading up on Stack Overflow on how to make an app with a "trial period". One of the answers recommended writing data to SharedPreferences, because they claimed it can remain when an app is uninstalled. That doesn't match what I remembered, so I thought it best to ask.– RockPaperLz- Mask it or CasketJun 12 '19 at 20:41
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SharedPreferences are backed by Google if the app participates in the backup. It would be best if you clarify whether "they" assumed your app would be backed up.– Firelord ♦Jun 13 '19 at 5:58
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@Firelord I don't back up anything to Google (well, not intentionally), so I'm looking up what you're referring to. I see a "Back up my data" option deep within Android Settings... is that it?– RockPaperLz- Mask it or CasketJun 13 '19 at 6:34
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1If auto backup is the issue, then you can clear the app data after reinstalling to delete all the shared preferences.– Andrew T. ♦Jun 14 '19 at 10:03
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SharedPreferences are actually saved in a file in the app private directory:
/data/data/package_name/shared_prefs/somefilename.xml
When an app is installed this directory and file are automatically created. When an app is uninstalled this directory is deleted along with its parent /data/data/package_name UNLESS the app is uninstalled in order to update it.
From command line this is done using the flag -k or -r that is
adb uninstall -k package_name - Keep the data and cache directories around after removal
adb install -r package_name - Replace existing application (effectively reinstall an existing app, keeping its data)
SharedPreferences database always deleted when app is uninstalled. but In Manifest
android:allowBackup="true"
If allowBackup is true then data is not clear even if application is uninstall then install. so always keep allowBackup false when data do not want store.
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Thank you. What is the best way to keep allowBackup as false? Jun 14 '19 at 6:35
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1@user298642 The allowBackup flag usually only affects the
adb backup. Do you have a source that backs your answer?– RobertJun 14 '19 at 19:57