[英]how do I traverse an android JSONArray witin a JSONObject
I have a JSONObject with the data structure as follows 我有一个JSONObject,数据结构如下
[{"distance":"200 meters","location_id":"519"},{"distance":"300 meters","location_id":"219"}]
and I'm trying to traverse each array within that object, I have the following code where locationArray is the valid JSONObject 我试图遍历该对象中的每个数组,我有以下代码,其中locationArray是有效的JSONObject
for (int j = 0; j < locationArray.length(); j++) {
JSONObject j_obj;
j_obj = locationArray.getJSONArray(j); //error here
location_id = j_obj.getString("location_id");
}
but i'm getting an error trying to find each sub array of locationArray with an integer. 但我在尝试使用整数查找locationArray的每个子数组时遇到错误。
the solution: 解决方案:
JSONArray rootArray = new JSONArray(jsonString);
int len = rootArray.length();
for(int i = 0; i < len; ++i) {
JSONObject obj = rootArray.getJSONObject(i);
location_id = obj.getString("location_id");
}
There is an error in your code. 您的代码中存在错误。
j_obj = locationArray.getJSONArray(j);
should be j_obj = locationArray.getJSONObject(j);
应该是
j_obj = locationArray.getJSONObject(j);
, as the object wrapped with curly braces represents a JSONObject
and not a JSONArray
,因为用花括号包裹的对象表示
JSONObject
而不是JSONArray
Edit: you may consider using obj.optString("location_id");
编辑:您可以考虑使用
obj.optString("location_id");
to avoid a potential problem 避免潜在的问题
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