Does saving username and password to a flat file with in an android app makes it less secure?

Question

I understand that each app runs within its own sandbox.

1. If that is the case, is it safe to save credentials in a flat file?

2. Apart from saving it in the database or over the network what are other options in saving credentials in an app?

Answer 1

You can store application credentials in SharedPreferences in android app instead of store in flat file.