如何从Android中的发布请求响应中获取特定的json键值? [英] How to get a specific json key value from post request response in Android?

问题描述

我收到来自使用HttpURLConnection的发帖请求的以下响应:

I have following response from post request using HttpURLConnection:

发布请求响应:

{
    "LatestData": [{
        "ExtraData": null,
        "ID": 0,
        "season": false,
        "latest": 0,
        "url": "http://www.awebsite.com/images/12.jpg"
    }]
}

如何获取URL的价值?我尝试了以下操作，但Android Studio不断给我错误:

How to get value of URL? I tried following but Android Studio keeps giving me error:

String newURL = sb.getJSONObject("LatestData").getString("url");
String newURL = sb.getJSONArray("LatestData").getJSONObject(0).getString("url");

Android Studio错误:

Android Studio Error:

error: cannot find symbol method getJSONObject(String)
error: cannot find symbol method getJSONArray(String)

你们能帮我获得url的值，并让我知道我需要导入到android studio的哪些库，以便getsonObject可以工作吗?谢谢

could you guys help me obtain the value of url and let me know what libraries i need to import to android studio so getsonObject works ?Thanks

android代码:

android code:

 if (myURLConnection.getResponseCode() == 200) {
                br = new BufferedReader(new InputStreamReader(myURLConnection.getInputStream(), "utf-8"));
                while (true) {
                    line = br.readLine();
                    if (line != null) {
                        sb.append(line + "\n");


                        //String newURL = sb.getJSONObject("LatestData").getString("url");
                        String newURL =sb.getJSONArray("LatestData").getJSONObject(0).getString("url");
                        mWebView.loadUrl("javascript:MyFunction('" +newURL + "');");
                    } else {
                        br.close();
                        return sb.toString();
                    }
                }
            }

推荐答案

您需要将sb转换为JSONObject才能访问属性:

You need to convert sb to a JSONObject to access properties:

JSONOjbect jsonResponse = new JSONObject(new String(sb));

然后:

try {
    JSONArray jsonArray = jsonResponse.getJSONArray("LatestData");
    if (jsonArray != null && jsonArray.length() > 0) {
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject dataOjbect = jsonArray.getJSONObject(i);
            String url = dataOjbect.getString("url");
        }
    }
} catch (Exception e) {
    e.printStackTrace();
}

这篇关于如何从Android中的发布请求响应中获取特定的json键值?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IT屋！