diff --git a/api/current.txt b/api/current.txt
index a263946..f788098 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -17664,7 +17664,7 @@
     method public boolean invokeBeam(android.app.Activity);
     method public boolean isEnabled();
     method public boolean isNdefPushEnabled();
-    method public boolean registerLockscreenDispatch(android.nfc.NfcAdapter.NfcLockscreenDispatch, int[]);
+    method public boolean registerLockscreenDispatch(android.nfc.NfcAdapter.NfcLockscreenDispatch, java.lang.String[]);
     method public void setBeamPushUris(android.net.Uri[], android.app.Activity);
     method public void setBeamPushUrisCallback(android.nfc.NfcAdapter.CreateBeamUrisCallback, android.app.Activity);
     method public void setNdefPushMessage(android.nfc.NdefMessage, android.app.Activity, android.app.Activity...);
diff --git a/core/java/android/nfc/NfcAdapter.java b/core/java/android/nfc/NfcAdapter.java
index 8991066..be098a8 100644
--- a/core/java/android/nfc/NfcAdapter.java
+++ b/core/java/android/nfc/NfcAdapter.java
@@ -1428,17 +1428,20 @@
     }
 
     public boolean registerLockscreenDispatch(final NfcLockscreenDispatch lockscreenDispatch,
-                                           int[] techList) {
+                                           String[] techList) {
         try {
             sService.registerLockscreenDispatch(new INfcLockscreenDispatch.Stub() {
                 @Override
                 public boolean onTagDetected(Tag tag) throws RemoteException {
                     return lockscreenDispatch.onTagDetected(tag);
                 }
-            }, techList);
+            }, Tag.techListFromStrings(techList));
         } catch (RemoteException e) {
             attemptDeadServiceRecovery(e);
             return false;
+        } catch (IllegalArgumentException e) {
+            Log.e(TAG, "Unable to register LockscreenDispatch", e);
+            return false;
         }
 
         return true;
diff --git a/core/java/android/nfc/Tag.java b/core/java/android/nfc/Tag.java
index 0d261d1..43be702 100644
--- a/core/java/android/nfc/Tag.java
+++ b/core/java/android/nfc/Tag.java
@@ -35,6 +35,7 @@
 
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.HashMap;
 
 /**
  * Represents an NFC tag that has been discovered.
@@ -195,6 +196,41 @@
         return strings;
     }
 
+    static int[] techListFromStrings(String[] techStringList) throws IllegalArgumentException {
+        if (techStringList == null) {
+            throw new IllegalArgumentException("List cannot be null");
+        }
+        int[] techIntList = new int[techStringList.length];
+        HashMap<String, Integer> stringToCodeMap = getTechStringToCodeMap();
+        for (int i = 0; i < techStringList.length; i++) {
+            Integer code = stringToCodeMap.get(techStringList[i]);
+
+            if (code == null) {
+                throw new IllegalArgumentException("Unknown tech type " + techStringList[i]);
+            }
+
+            techIntList[i] = code.intValue();
+        }
+        return techIntList;
+    }
+
+    private static HashMap<String, Integer> getTechStringToCodeMap() {
+        HashMap<String, Integer> techStringToCodeMap = new HashMap<String, Integer>();
+
+        techStringToCodeMap.put(IsoDep.class.getName(), TagTechnology.ISO_DEP);
+        techStringToCodeMap.put(MifareClassic.class.getName(), TagTechnology.MIFARE_CLASSIC);
+        techStringToCodeMap.put(MifareUltralight.class.getName(), TagTechnology.MIFARE_ULTRALIGHT);
+        techStringToCodeMap.put(Ndef.class.getName(), TagTechnology.NDEF);
+        techStringToCodeMap.put(NdefFormatable.class.getName(), TagTechnology.NDEF_FORMATABLE);
+        techStringToCodeMap.put(NfcA.class.getName(), TagTechnology.NFC_A);
+        techStringToCodeMap.put(NfcB.class.getName(), TagTechnology.NFC_B);
+        techStringToCodeMap.put(NfcF.class.getName(), TagTechnology.NFC_F);
+        techStringToCodeMap.put(NfcV.class.getName(), TagTechnology.NFC_V);
+        techStringToCodeMap.put(NfcBarcode.class.getName(), TagTechnology.NFC_BARCODE);
+
+        return techStringToCodeMap;
+    }
+
     /**
      * For use by NfcService only.
      * @hide