Question

我想检查我的Android应用程序，如果用户的电子邮件Facebook存在与否，如果它不存在，请将其设置为＆＃34;找不到邮件＆＃34;。代码是正确的但当我点击Facebook按钮时没有发生任何事情，因为我不存在的电子邮件导致错误。我已经检查了我的用户令牌，我的Facebook帐户没有收到电子邮件。显然，如果没有电子邮件字符串，它就能完美运行。

这是我的代码：

loginButtonFb.setReadPermissions("user_friends", "email");
    loginButtonFb.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {

            new GraphRequest(
                    AccessToken.getCurrentAccessToken(),
                    loginResult.getAccessToken().getUserId(),
                    null,
                    HttpMethod.GET,
                    new GraphRequest.Callback() {
                        public void onCompleted(GraphResponse response) {
                            try {
                                JSONObject data = response.getJSONObject();
                                login_name = data.getString("name");
                                String idFb = data.getString("id");
                                String mailFb = data.getString("email");
                                String method = "loginFb";
                                BackgroundTaskLogin backgroundTask = new BackgroundTaskLogin(mContext);
                                backgroundTask.execute(method, login_name, idFb, mailFb);
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }
                    }
            ).executeAsync();

        }

        @Override
        public void onCancel() {
            Toast.makeText(mContext, "Login attempt canceled.", Toast.LENGTH_LONG).show();
        }

        @Override
        public void onError(FacebookException e) {
            Toast.makeText(mContext, "Login attempt failed.", Toast.LENGTH_LONG).show();
        }
    });

Answer 1

我已经解决了这个问题。我已将String mailFb声明为通用String。代码的另一部分如下：

 loginButtonFb.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {

            new GraphRequest(
                    AccessToken.getCurrentAccessToken(),
                    loginResult.getAccessToken().getUserId(),
                    null,
                    HttpMethod.GET,
                    new GraphRequest.Callback() {
                        public void onCompleted(GraphResponse response) {
                            try {
                                JSONObject data = response.getJSONObject();
                                login_name = data.getString("name");
                                String idFb = data.getString("id");
                                if(!data.isNull("email")){
                                mailFb = data.getString("email");
                                }
                                mailFb = "Mail not found";
                                String method = "loginFb";
                                BackgroundTaskLogin backgroundTask = new BackgroundTaskLogin(mContext);
                                backgroundTask.execute(method, login_name, idFb, mailFb);
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }
                    }
            ).executeAsync();

        }

检查android是否存在facebook-mail

1 个答案: