将 JSONArray 项转换为 JSONObject - ClassCastException

Question

I try to process JSON response with help of "org.json" library. So, I convert string response to JSONArray:

JSONArray listWallPosts = jsonWallPosts.getJSONArray("response");

and listWallPosts contains for example such data set:

[1388,
{
    "date": 1441127306,
    "from_id": 45700,
    "comments": {
        "count": 0,
        "can_post": 1
    },
    "to_id": 44970,
    "online": 0,
    "post_type": "post",
    "id": 2469,
    "text": "Some message",
    "reply_count": 0
},
{
    "date": 1425812975,
    "from_id": 16089771,
    "comments": {
        "count": 0,
        "can_post": 1
    },
    "to_id": 44970,
    "online": 0,
    "post_type": "post",
    "id": 2467,
    "text": "Some another message",
    "reply_count": 0,
}]

When I try to process list items in loop:

for(int j=0; j< listWallPosts.length(); j++){
    JSONObject post = (JSONObject)listWallPosts.get(j);
    //do something
}

I face with ClassCastException -- java.lang.Integer cannot be cast to org.json.JSONObject .

Can someone suggest best approach to handle it? Should I wrap casting from list item to JSONObject in try-catch or are there better options?

Answer 1

Looks like your response has some sort of ID and a list of JSONObject s associated with it. You may have to code somewhat like this:

int id = listWallPosts.getInt(0);
for(int j = 1; j < listWallPosts.length(); j++) {
    JSONObject post = listWallPosts.getJSONObject(j);
}

Answer 2

In my current approach I handle it with instanceof in if statement:

for(int j=0; j< listWallPosts.length(); j++){
    if(listWallPosts.get(j) instanceof JSONObject){
        JSONObject post = (JSONObject)listWallPosts.get(j);
        //to do something
    }
}