Android Question Test the application for x days

[Isac]

How can you do to test your application for 3 days?
Past 3 days the application stops asking for a password.
Has anyone tried it?
Thank You

 

[Erel]

It depends on the how secure you want it to be.

A simple solution is to create a file somewhere on the external storage with the current date. When your app starts check whether this file exists and if not create it.
If it exists read the stored time and compare it to the current time.

The file should NOT be saved in File.DirInternal or File.DirDefaultExternal as both these folders are deleted when the app is uninstalled.

 

[Isac]

The file should NOT be saved in File.DirInternal or File.DirDefaultExternal as both these folders are deleted when the app is uninstalled

Where should I save?

The user in this case can always change the date of the saved file?

 

[lemonisdead]

Another idea : make a mix of Erel's proposal and a reverse solution :

• first launch :
  • get the user's account e-mail address and send it to a server. Store the address on the server
  • if the address is not present on the server : create a file locally and store the date
• each new launch :
  • check if the file exists
    • if the file doesn't exist : get the user's account e-mail address and send it to your server. If the e-mail address is stored on the server, reply negatively and don't create a file
    • if the file exists : check the date. If the date is after the 3 days, delete the file

 

[DonManfred]

Where should I save?

Like erel already stated

A simple solution is to create a file somewhere on the external storage

 

[Erel]

The user in this case can always change the date of the saved file?

This is correct. For a more robust solution you will need to use an online server which tracks the installation.

 

[Cableguy]

The user in this case can always change the date of the saved file?

You can always encrypt you date string, keep it in ticks value, add a fixed string before encryption. .. there are many ways to at least make the user question him self "wff is this?"
Also, to ensure that deleting the file does not reset your trial period, make the app create a fîle somewhere with a "Never has run" string.. this way.. simple deletion will not reset your trial.

 

[Isac]

Good solution, but you have some examples to encrypt?
thank you

 

[Cableguy]

Look for the crypto lib in the libs forum... Plenty of examples to get you going... You can even choose different types of encryption