本文介绍了Android - JSONException没有值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我知道这里有几个问题都有相同的主题和错误,但没有一个表明我的问题同样如此,所以我决定在这里发帖,希望有人帮我指出原因。
所以我正在尝试在我的应用程序中实现登录功能,这里是代码:

I know that there are several questions posted on here with the same topic and error, but none of them indicate the same problem as mine, so I decided to post my question here, hoping that someone would help me point out the cause.So I'm trying to implement the login feature in my app and here's the code:

if (tag.equalsIgnoreCase(login_tag)){
                // check for login response
                try {
                    if (json.getString(KEY_SUCCESS) != null) {
                        String res = json.getString(KEY_SUCCESS);
                        if(Integer.parseInt(res) == 1){
                            // user successfully logged in
                            // Store user details in SQLite Database
                            DatabaseHandler db = new DatabaseHandler(mContext);
                            JSONObject json_user = json.getJSONObject("user");

                            // Clear all previous data in database
                            logoutUser(mContext);
                            Toast.makeText(mContext, json.toString(3), Toast.LENGTH_LONG).show();
                            db.addUser(json_user.getString(KEY_EMAIL), json_user.getString(KEY_NAME), json.getString(KEY_UID), json.getString(KEY_AVA), json_user.getString(KEY_BDAY), json_user.getString(KEY_COUNTRY), json_user.getString(KEY_PREF), json_user.getString(KEY_SPEND));

                            // Launch Dashboard Screen
                            Intent dashboard = new Intent(mContext, DashboardActivity.class);

                            // Close all views before launching Dashboard
                            dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                            mContext.startActivity(dashboard);

                            // Close Login Screen
                            ((Activity) mContext).finish();
                        }
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }

这是我登录时收到的JSON响应:

And this is the JSON response I got when logging in:

{
    "tag": "login",
    "success": 1,
    "error": 0,
    "uid": "5123",
    "user": {
        "email": "abcxyz@gmail.com",
        "name": "abc",
        "avatar": "avatars/img_hzsxda_2013-03-18-11-03-33.jpg",
        "bday": "1991-02-01",
        "country": "Australia",
        "preferences": "none",
        "spending": "none"
    }
}

显然,头像有一个值,但我仍然有这个我的logcat警告:

So apparently there is a value for avatar, but I still got this warning in my logcat:

03-18 12:06:36.972: W/System.err(24574): org.json.JSONException: No value for avatar

由于没有得到任何价值的头像,我无法完成 addUser ,因此登录失败。
请帮我找出错误以及如何解决。谢谢。

Since no value avatar is got, I can't complete addUser, hence login fails.Please help me find the error and how to solve it. Thank you.

推荐答案

您使用了错误的对象来获取头像这里的值 json.getString(KEY_AVA)。它应该是 json_user.getString(KEY_AVA)

You are using the wrong object to get avatar value here json.getString(KEY_AVA). It should be json_user.getString(KEY_AVA).

此外,你可以使用 optString 而不是 getString 如果值不存在则返回 null 而不是抛出例外。

Also, you can use optString instead of getString which just returns null if value doesn't exist, instead of throwing an exception.

这篇关于Android - JSONException没有值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

06-03 11:55
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