Obtener correo electrónico de Facebook después de iniciar sesión en Android

Aquí está mi código realizando la conexión.

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, Object state) { Log.d(TAG, "FileNotFoundException: " + e.getMessage()); } @Override public void onMalformedURLException(MalformedURLException e, Object state) { Log.d(TAG, "MalformedURLException: " + e.getMessage()); } @Override public void onFacebookError(FacebookError e, Object state) { Log.d(TAG, "FacebookError: " + e.getMessage()); } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { mFacebook.authorizeCallback(requestCode, resultCode, data); } } 

Como respuesta, obtengo un JSON. Ejemplo:

• Retrofit - eliminando algunos caracteres inválidos del cuerpo de respuesta antes de analizarlo como json
• Cómo obtener una excepción NullPointerException al analizar JSON
• ¿Cuál usar? JSONObject de org.json VS JsonObject de javax.json
• Error StrictMode $ AndroidBlockGuardPolicy.onNetwork
• Pasando el objeto JSON en la URL del servicio Web RESTFUL en Android?

 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"} 

Mi pregunta es ¿cómo puedo obtener el correo electrónico del usuario (el correo electrónico con el que se registra en Facebook)?

  OpenRequest openRequest = new OpenRequest(this); List<String> readPermissions = new ArrayList<String>(); readPermissions.add("email"); openRequest.setPermissions(readPermissions); openRequest.setLoginBehavior(SessionLoginBehavior.SSO_WITH_FALLBACK); openRequest.setCallback(statusCallback); session.openForRead(openRequest); 

 List<String> permissions = new ArrayList<String>(); permissions.add("email");