在Android登录后获取facebook电子邮件

import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.MalformedURLException;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.facebook.android.AsyncFacebookRunner;
import com.facebook.android.AsyncFacebookRunner.RequestListener;
import com.facebook.android.DialogError;
import com.facebook.android.Facebook;
import com.facebook.android.Facebook.DialogListener;
import com.facebook.android.FacebookError;
import com.facebook.android.Util;

public class FacebookConnect extends Activity{

    public static final String TAG = "FACEBOOK";
    private Facebook mFacebook;
    public static final String APP_ID = "XXX";
    private AsyncFacebookRunner mAsyncRunner;
    private static final String[] PERMS = new String[] { "read_stream" };
        private SharedPreferences sharedPrefs;
        private Context mContext; 

        private TextView username;
        private ProgressBar pb;
        String fbId,fbName,fbEmail;

        public void setConnection() {
                mContext = this;
                mFacebook = new Facebook(APP_ID);
                mAsyncRunner = new AsyncFacebookRunner(mFacebook);
        }

        public void getID(TextView txtUserName,ProgressBar progbar) {
                username = txtUserName;
                pb = progbar;
                if (isSession()) {
                        Log.d(TAG,"sessionValid");
                        mAsyncRunner.request("me",new IDRequestListener());
                } else {
                    // no logged in,so relogin
                    Log.d(TAG,"sessionNOTValid,relogin");
                        mFacebook.authorize(this,PERMS,new LoginDialogListener());
                }
        }

        public boolean isSession() {
                sharedPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);
                String access_token = sharedPrefs.getString("access_token","x");
            Long expires = sharedPrefs.getLong("access_expires",-1);
                Log.d(TAG,access_token);

                if (access_token != null && expires != -1) {
                        mFacebook.setAccessToken(access_token);
                        mFacebook.setAccessExpires(expires);
                }
                return mFacebook.isSessionValid();
        }

        private class LoginDialogListener implements DialogListener {

                @Override
                public void onComplete(Bundle values) {
                        Log.d(TAG,"LoginONComplete");
                    String token = mFacebook.getAccessToken();
                    long token_expires = mFacebook.getAccessExpires();
                    Log.d(TAG,"AccessToken: " + token);
                    Log.d(TAG,"AccessExpires: " + token_expires);
                    sharedPrefs = PreferenceManager
                                    .getDefaultSharedPreferences(mContext);
                    sharedPrefs.edit().putLong("access_expires",token_expires).commit();
                    sharedPrefs.edit().putString("access_token",token).commit();
                    mAsyncRunner.request("me",new IDRequestListener());
                }

                @Override
                public void onFacebookError(FacebookError e) {
                        Log.d(TAG,"FacebookError: " + e.getMessage());
                }

                @Override
                public void onError(DialogError e) {
                        Log.d(TAG,"Error: " + e.getMessage());
                }

                @Override
                public void onCancel() {
                        Log.d(TAG,"OnCancel");
                }
        }

        private class IDRequestListener implements RequestListener {

                @Override
                public void onComplete(String response,Object state) {
                        try {
                                Log.d(TAG,"IDRequestONComplete");
                            Log.d(TAG,"Response: " + response.toString());
                                JSONObject json = Util.parseJson(response);
                                fbId = json.getString("id");
                                fbName = json.getString("name");
                                //fbEmail = json.getString("email");

                                FacebookConnect.this.runOnUiThread(new Runnable() {
                                    public void run() {
                                    username.setText("Welcome: " + name + "\n ID: " + fbId);
                                pb.setVisibility(ProgressBar.GONE);
                                    }
                            });
                        } catch (JSONException e) {
                                Log.d(TAG,"JSONException: " + e.getMessage());
                    } catch (FacebookError e) {
                            Log.d(TAG,"FacebookError: " + e.getMessage());
                        }
                }

                @Override
                public void onIOException(IOException e,Object state) {
                        Log.d(TAG,"IOException: " + e.getMessage());
                }

                @Override
                public void onFileNotFoundException(FileNotFoundException e,"FileNotFoundException: " + e.getMessage());
                }

                @Override
                public void onMalformedURLException(MalformedURLException e,"MalformedURLException: " + e.getMessage());
                }

                @Override
                public void onFacebookError(FacebookError e,"FacebookError: " + e.getMessage());
                }

        }

        @Override
        protected void onActivityResult(int requestCode,int resultCode,Intent data) {
                mFacebook.authorizeCallback(requestCode,resultCode,data);
        }
}@H_502_3@ 
 
作为回应我得到一个JSON.例：
 
  
 
08-15 14:22:42.160: DEBUG/FACEBOOK(1258): Response: {"id":"3159628280","name":"Peter Black","first_name":"Peter","last_name":"Black","link":"http:\/\/www.facebook.com\/Peter.Black","username":"Peter.Black","gender":"male","timezone":3,"locale":"bg_BG","verified":true,"updated_time":"2011-08-14T08:42:59+0000"}@H_502_3@ 
 
我的问题是如何获取用户的电子邮件(他登录到Facebook的电子邮件)？