To set a passcode on the Dropbox Android app:
- Open the Dropbox app.
- Tap
(account). - Tap
(settings) (or Settings in older versions of the app). - Under the Features section, tap Configure passcode.
- Tap Turn passcode on.
- Enter and confirm your new passcode.
Once you set a passcode, your device will be logged out from Dropbox if there are 10 consecutive failed passcode attempts.
From the Configure passcode settings page, you can change or disable your passcode. You can also enable a setting that will delete any offline files stored on your device if the wrong passcode is entered more than 10 times.