Android:从JSON动态获取JSON数组键名

Question

我有一个json链接,如果我们打开它,我会得到以下结果

{
"Status": "Success",

"All_Details": [{
    "Types": "0",
    "TotalPoints": "0",
    "ExpiringToday": 0
}],
"First": [{
    "id": "0",
    "ImagePath": "http://first.example.png"
}],
"Second": [{
    "id": "2",
    "ImagePath": "http://second.example.png"
}],
"Third": [{
    "id": "3",
    "ImagePath": "http://third.example.png"
}],

}

我需要的是,我想动态获取所有关键名称,如status,All_details,First等.

我还想在All_details和First Array中获取数据.我使用以下方法

@Override
        public void onResponse(JSONObject response) throws JSONException {
            VolleyLog.d(TAG, "Home Central OnResponse: " + response);

            String statusStr = response.getString("Status");
            Log.d(TAG, "Status: " + statusStr);

            if (statusStr.equalsIgnoreCase("Success")) {
                Iterator iterator = response.keys();
                while (iterator.hasNext()) {
                    String key = (String)iterator.next();
                }
            }
        }

我得到了存储在String键中的所有键名.但是我无法打开获取JSON数组中的值,例如.我需要使用String(Key)获取第一个和第二个数组中的值.我怎样才能做到这一点.？？？

Answer 1

首先,要获取键名,您可以轻松地遍历JSONObject本身,如下所述:

Iterator<?> keys = response.keys();
while( keys.hasNext() ) {
    String key = (String)keys.next();
    if ( response.get(key) instanceof JSONObject ) {
        System.out.println(key); // do whatever you want with it
    }
}

然后,获取数组的值:

    JSONArray arr = response.getJSONArray(key);
    JSONObject element;
    for(int i = 0; i < arr.length(); i++){
        element = arr.getJSONObject(i); // which for example will be Types,TotalPoints,ExpiringToday in the case of the first array(All_Details) 
    }