android - json 数组中元素的计数

Question

这是我的 JSON 数组，

[{
    "textinput": [{
        "position": 0,
        "dependency": "no",
        "id": 0,
        "label": "single1",
        "Itype": "textinput"
    }, {
        "position": 1,
        "dependency": "no",
        "id": 1,
        "label": "single2",
        "Itype": "textinput"
    }, {
        "position": 2,
        "dependency": "no",
        "id": 2,
        "label": "single3",
        "Itype": "textinput"
    }, {
        "position": 3,
        "dependency": "no",
        "id": 3,
        "label": "single4",
        "Itype": "textinput"
    }, {
        "position": 4,
        "dependency": "no",
        "id": 4,
        "label": "single5",
        "Itype": "textinput"
    }, {
        "position": 5,
        "dependency": "no",
        "id": 5,
        "label": "single6",
        "Itype": "textinput"
    }]
}]

我想获得有关计算上述数组中 position 数量的帮助。

Answer 1

你错过了 j :P

try {
     JSONArray jsonArray = new JSONArray("Your response");    
     int count = jsonArray.getJSONObject(0).getJSONArray("textinput").length();
 } catch (JSONException e) {
     e.printStackTrace();
 }