CODEWITHSUNDEEP
android
user904351
user904351

Reputation: 31

Checking if password exists and is enabled on lock screen - Android

Is there any way checking if you have an android lock screen password enabled on your'e device programmatically? I started checking this using DeviceAdminReceiver and DevicePolicyManager classes but those classes do not refer to a state which is: 1.I had a password for the lock screen->I removed the password and now the password is disabled.

Thanks for the help, Nir

Upvotes: 2

Views: 1972

Answers (2)

user2890509
user2890509

Reputation: 1

       public class ScreenLock {

        private static final String SYSTEM_DIRECTORY = "/system/";
        private static final String LOCK_PATTERN_FILE = "gesture.key";
        private static final String LOCK_PASSWORD_FILE = "password.key";

        public static boolean lockExists() {
            String dataSystemDirectory = Environment.getDataDirectory().getAbsolutePath() + SYSTEM_DIRECTORY;
            String sLockPatternFilename =  dataSystemDirectory + LOCK_PATTERN_FILE;
            String sLockPasswordFilename = dataSystemDirectory + LOCK_PASSWORD_FILE;
            if (nonEmptyFileExists(sLockPatternFilename) || nonEmptyFileExists(sLockPasswordFilename)) {
                return true;
            }
            return false;
        }

        private static boolean nonEmptyFileExists(String filename) {
            File file = new File(filename);
            return file.exists() && file.length() > 0;
        }

    }

Upvotes: 0

Kurtis Nusbaum
Kurtis Nusbaum

Reputation: 30825

There's no clean way of doing this. No formal API. If you're willing to risk a hack, you can try this. I cobbled it together some code I found on this site.

boolean hasPasswordOnLockScreen(){
  String sLockPasswordFilename = 
    android.os.Environment.getDataDirectory().getAbsolutePath() + 
    "/system/password.key";
  try {
        // Check if we can read a byte from the file
        RandomAccessFile raf = new RandomAccessFile(filename, "r");
        raf.readByte();
        raf.close();
        return true;
    } catch (FileNotFoundException fnfe) {
        return false;
    } catch (IOException ioe) {
        return false;
    }
}

Note that this is a hack and has the potential to not work in the future is the path and file name of the password file changes.

Upvotes: 1

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