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FingerprintUtils.javaAPI DocAndroid 5.1 API3525Thu Mar 12 22:22:10 GMT 2015android.service.fingerprint

FingerprintUtils

public class FingerprintUtils extends Object
Utility class for dealing with fingerprints and fingerprint settings.
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Fields Summary
private static final boolean
DEBUG
private static final String
TAG
Constructors Summary
Methods Summary
public static voidaddFingerprintIdForUser(int fingerId, android.content.ContentResolver res, int userId)

        int[] fingerIds = getFingerprintIdsForUser(res, userId);

        // FingerId 0 has special meaning.
        if (fingerId == 0) return;

        // Don't allow dups
        for (int i = 0; i < fingerIds.length; i++) {
            if (fingerIds[i] == fingerId) return;
        }
        int[] newList = Arrays.copyOf(fingerIds, fingerIds.length + 1);
        newList[fingerIds.length] = fingerId;
        Settings.Secure.putStringForUser(res, Settings.Secure.USER_FINGERPRINT_IDS,
                Arrays.toString(newList), userId);
public static int[]getFingerprintIdsForUser(android.content.ContentResolver res, int userId)


           
        String fingerIdsRaw = Settings.Secure.getStringForUser(res,
                Settings.Secure.USER_FINGERPRINT_IDS, userId);

        int result[] = {};
        if (!TextUtils.isEmpty(fingerIdsRaw)) {
            String[] fingerStringIds = fingerIdsRaw.replace("[","").replace("]","").split(", ");
            result = new int[fingerStringIds.length];
            for (int i = 0; i < result.length; i++) {
                try {
                    result[i] = Integer.decode(fingerStringIds[i]);
                } catch (NumberFormatException e) {
                    if (DEBUG) Log.d(TAG, "Error when parsing finger id " + fingerStringIds[i]);
                }
            }
        }
        return result;
public static booleanremoveFingerprintIdForUser(int fingerId, android.content.ContentResolver res, int userId)

        // FingerId 0 has special meaning. The HAL layer is supposed to remove each finger one
        // at a time and invoke notify() for each fingerId.  If we get called with 0 here, it means
        // something bad has happened.
        if (fingerId == 0) throw new IllegalStateException("Bad fingerId");

        int[] fingerIds = getFingerprintIdsForUser(res, userId);
        int[] resultIds = Arrays.copyOf(fingerIds, fingerIds.length);
        int resultCount = 0;
        for (int i = 0; i < fingerIds.length; i++) {
            if (fingerId != fingerIds[i]) {
                resultIds[resultCount++] = fingerIds[i];
            }
        }
        if (resultCount > 0) {
            Settings.Secure.putStringForUser(res, Settings.Secure.USER_FINGERPRINT_IDS,
                    Arrays.toString(Arrays.copyOf(resultIds, resultCount)), userId);
            return true;
        }
        return false;