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For the Android OS, I need to find out what the user uses to unlock the device. Be it null, PIN, pattern, fingerprint.

theAnonymous
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  • Erm ...... why? – Stephen C Jun 02 '17 at 02:50
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    Because the boss said so. – theAnonymous Jun 02 '17 at 02:54
  • Why did the boss say so? 'Cos this sounds like the kind of thing that could have (bad) security implications for the user. – Stephen C Jun 02 '17 at 03:43
  • Well yes ... but the considerations part may inform you if it is likely to be possible to do this. The functionality may not be supported *because of* the security and privacy considerations. At that point, knowing what you are actually trying to achieve might allow someone to suggest **better** alternatives to you / your boss. – Stephen C Jun 02 '17 at 04:40

1 Answers1

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To Detect if an authenticated fingerprint exists:

FingerprintManagerCompat fingerprintManagerCompat = FingerprintManagerCompat.from(context);

if (fingerprintManagerCompat.isHardwareDetected() && fingerprintManagerCompat.hasEnrolledFingerprints()) { 
    // Device supports fingerprint authentication and has registered a fingerprint     
}

To use this you also need to add a permission

<uses-permission android:name="android.permission.USE_FINGERPRINT" />

To check if lock pattern is enabled:

ContentResolver cr = getContentResolver();

int lockPatternEnable = Settings.Secure.getInt(cr, Settings.Secure.LOCK_PATTERN_ENABLED, 0);
// If user has pattern unlock then lockPatternEnable will be 1 else 0

There is no explicit way to check for pin/password as far as I'm aware but you can use KeyGuardManager's isDeviceSecure() method

which returns true if device is secured with a PIN, pattern or password. Coupled with the pattern check you can detect if pin is enabled.

Remember to test for fingerprint first because it requires a pin/password unlock to be set as well

ashkhn
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