GCMRegistrar.getRegistrationId returns empty String

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I have some problem to using GCM in Fragment.
first, I get example App to using GCM I try and it work fine.
so I using this example code to I use in my Application but I always getting empty string from GCMRegistrar.getRegistrationId
this is my code.

Controller.java

public class Controller extends Application{
 
    private  final int MAX_ATTEMPTS = 5;
    private  final int BACKOFF_MILLI_SECONDS = 2000;
    private  final Random random = new Random();
 
    static Context ct;
 
    public Controller(Context context) {
        ct = context.getApplicationContext();
    }
 
    // Register this account with the server.
    public void register(final Context context, String name, String email, final String regId) {
 
        Log.i(Config.TAG, "registering device (regId = " + regId + ")");
 
        String serverUrl = Config.YOUR_SERVER_URL;
 
        Map<String, String> params = new HashMap<String, String>();
        params.put("regId", regId);
        params.put("name", name);
        params.put("email", email);
 
        ....
    }
 
    // Notifies UI to display a message.
    public void displayMessageOnScreen(Context context, String message) {
        Intent intent = new Intent(Config.DISPLAY_MESSAGE_ACTION);
        intent.putExtra(Config.EXTRA_MESSAGE, message);
        context.sendBroadcast(intent);
    }
 
}

Config.java

public interface Config {
    static final String YOUR_SERVER_URL =  "url Server";
    static final String GOOGLE_SENDER_ID = "sender id";
    static final String TAG = "GCM Android ";
    static final String DISPLAY_MESSAGE_ACTION ="com.MyApp.gcm.DISPLAY_MESSAGE";
    static final String EXTRA_MESSAGE = "message";               
}

GCMIntentService.java

public class GCMIntentService extends GCMBaseIntentService {
 
    private static final String TAG = "GCMIntentService";
    private Controller aController = null;
    public GCMIntentService() {
        super(Config.GOOGLE_SENDER_ID);
    }
 
    @Override
    protected void onRegistered(Context context, String registrationId) {
        if(aController == null)
            aController = (Controller) getApplicationContext();
        Log.i(TAG, "Device registered: regId = " + registrationId);
        aController.displayMessageOnScreen(context, "Your device registred with GCM");
        aController.register(context, ProfileFragment.name, ProfileFragment.email, registrationId);
    }
 
    @Override
    protected void onUnregistered(Context context, String registrationId) {
        if(aController == null)
            aController = (Controller) getApplicationContext();
        Log.i(TAG, "Device unregistered");
        aController.displayMessageOnScreen(context, getString(R.string.gcm_unregistered));
        aController.unregister(context, registrationId);
    }
 
    @Override
    protected void onMessage(Context context, Intent intent) {
        if(aController == null)
            aController = (Controller) getApplicationContext();
        Log.i(TAG, "Received message");
        String message = intent.getExtras().getString("price");
        aController.displayMessageOnScreen(context, message);
        generateNotification(context, message);
    }
 
    @Override
    protected void onDeletedMessages(Context context, int total) {
        if(aController == null)
            aController = (Controller) getApplicationContext();
        Log.i(TAG, "Received deleted messages notification");
        String message = getString(R.string.gcm_deleted, total);
        aController.displayMessageOnScreen(context, message);
        generateNotification(context, message);
    }
 
    @Override
    public void onError(Context context, String errorId) {
        if(aController == null)
            aController = (Controller) getApplicationContext();
        Log.i(TAG, "Received error: " + errorId);
        aController.displayMessageOnScreen(context, getString(R.string.gcm_error, errorId));
    }
 
    @Override
    protected boolean onRecoverableError(Context context, String errorId) {
        if(aController == null)
            aController = (Controller) getApplicationContext();
        Log.i(TAG, "Received recoverable error: " + errorId);
        aController.displayMessageOnScreen(context, getString(R.string.gcm_recoverable_error, errorId));
        return super.onRecoverableError(context, errorId);
    }
 
    private static void generateNotification(Context context, String message) {
        int icon = R.drawable.ic;
        long when = System.currentTimeMillis();
        NotificationManager notificationManager = (NotificationManager)
                context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = new Notification(icon, message, when);
        String title = context.getString(R.string.app_name);
        Intent notificationIntent = new Intent(context, ProfileFragment.class);
        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
                Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent intent =
                PendingIntent.getActivity(context, 0, notificationIntent, 0);
        notification.setLatestEventInfo(context, title, message, intent);
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notification.defaults |= Notification.DEFAULT_SOUND;
        notification.defaults |= Notification.DEFAULT_VIBRATE;
        notificationManager.notify(0, notification);
    }
}

AndroidManifest.xml

<permission
            android:name="com.MyApp.permission.C2D_MESSAGE"
            android:protectionLevel="signature" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <uses-permission android:name="android.permission.WAKE_LOCK"/>
    <uses-permission android:name="com.MyApp.permission.C2D_MESSAGE" />
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.VIBRATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
    <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS"/>
<application
            android:allowBackup="true"
            android:icon="@drawable/ic"
            android:label="@string/app_name"
            android:theme="@style/AppTheme">
        <activity
                .....
            <intent-filter>
                <action android:name="android.intent.action.VIEW"/>
                <action android:name="android.intent.action.DELETE"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>

        <receiver
                android:name="com.google.android.gcm.GCMBroadcastReceiver"
                android:permission="com.google.android.c2dm.permission.SEND" >
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
                <category android:name="com.MyApp" />
            </intent-filter>
        </receiver>
        <service android:name=".gcm.GCMIntentService" android:enabled="true"/>
    </application>

LoginFragment.java

GCMRegistrar.checkDevice(getActivity());
GCMRegistrar.checkManifest(getActivity());
final String regaId = GCMRegistrar.getRegistrationId(getActivity().getApplicationContext());
if (regaId.equals("")) {
    GCMRegistrar.register(getActivity(), Config.GOOGLE_SENDER_ID);
} else {
     .....
}

please help me..