How to determine if the app is being used for the first time?

[Hannah R]

Hi,

How can I find out when the app was launched the first time after installation? 
Thank you a lot. 

[Javier Anton]

You can use Preferences to write a small boolean value that is set to true after the first time the app is used

Updating an already installed app wont reset the flag as that re uses the app data folder

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[Hannah R]

Thank you, Javier. 

I wondered if there are any other options because I use Preferences.clearAll() in some cases, as well as I wasn't sure about app updates etc. But I guess if there are no other ways or this is the best one, will do it. 

[Ben Thacker]

You could reset the flag immediately after the ClearAll.

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[Hannah R]

Yes, that what I was thinking. 

[Javier Anton]

Oh yes, just use the Storage class to write its own file instead of Preferences and then you won't have to worry about Prefs.clearAll

Preferences just uses a single file where it stores a dictionary, but you can write separate files and that will take care of it

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[Shai Almog]

Preferences clearAll is pretty destructive. I would suggest using it only in extreme cases.

[Hannah R]

I noticed that Android 7 device (API 24) doesn't erase some of the preferences when the app is being reinstalled, unless I call clearAll() or manually choose "Clear Data" in the App Storage settings. 
This caused some bugs. 
Adding  android.allowBackup=false to the hints resolved this particular problem. 

[Shai Almog]

You can delete individual files in storage one by one. Just avoid the preferences file name.