public void verifyExistentAccount() {
   SharedPreferences prefs = getSharedPreferences(TwAPImeApplication.PREFS_NAME, MODE_PRIVATE);
   //
   if (prefs.getString(AuthActivity.PREFS_KEY_TOKEN, null) == null) {
     startActivity(new Intent(this, AuthActivity.class));
   } else {
     Token token =
         new Token(
             prefs.getString(AuthActivity.PREFS_KEY_TOKEN, null),
             prefs.getString(AuthActivity.PREFS_KEY_TOKEN_SECRET, null));
     //
     Credential c =
         new Credential(
             prefs.getString(AuthActivity.PREFS_KEY_USERNAME, null),
             AuthActivity.CONSUMER_KEY,
             AuthActivity.CONSUMER_SECRET,
             token);
     //
     UserAccountManager uam = UserAccountManager.getInstance(c);
     //
     try {
       if (uam.verifyCredential()) {
         TwAPImeApplication app = (TwAPImeApplication) getApplication();
         app.setUserAccountManager(uam);
         //
         startActivity(new Intent(this, HomeActivity.class));
       } else {
         startActivity(new Intent(this, AuthActivity.class));
       }
     } catch (Exception e) {
       startActivity(new Intent(this, AuthActivity.class));
     }
   }
 }
 /** @see com.twapime.app.util.AsyncServiceCall#run(P[]) */
 @Override
 protected List<UserAccount> run(UserAccount... params)
     throws IOException, LimitExceededException {
   TwAPImeApplication app = (TwAPImeApplication) getContext().getApplicationContext();
   UserAccountManager uam = app.getUserAccountManager();
   List<UserAccount> result = new ArrayList<UserAccount>();
   //
   for (UserAccount user : params) {
     result.add(uam.updateProfile(user));
   }
   //
   return result;
 }