title: Check if Android filesystem is encrypted
body: <p>We are developing secure application for Android. It's required for users to keep filesystems of their devices encrypted, but we have to check this fact and forbid to use app. Is it possible to check if filesystem is encrypted? Also there are some devices with Android &lt; 3.0 that supports encryption, for example Motorola RAZR. It would be interesting to know about encryption on such devices.</p>