什么是org.json.JSONException的原因：网址没有价值 [英] what is the cause of org.json.JSONException: No value for url

问题描述

这是在code .ofcourse的网址传回的数据。

 保护无效showList（）{
    尝试{
        JSONObject的jsonObj =新的JSONObject（myJSON）;
        人民= jsonObj.getJSONArray（TAG_RESULTS）;        的for（int i = 0; I＆LT; peoples.length（）;我++）{
            JSONObject的C = peoples.getJSONObject（I）
            字符串ID = c.getString（TAG_ID）;
            字符串URL = c.getString（TAG_URL）;
            Listitem.add（新列表项（ID，URL））;
        }        GridViewAdapter适配器=新GridViewAdapter（这一点，R.layout.grid_item_layout，列表项）;
     // gridView.setAdapter（gridAdapter）;       list.setAdapter（适配器）;    }赶上（JSONException E）{
        e.printStackTrace（）;
    }
 

asycntask和网址

 保护字符串doInBackground（字符串... PARAMS）{
                DefaultHttpClient的HttpClient =新DefaultHttpClient（新BasicHttpParams（））;
                HttpPost httppost =新HttpPost（http://justedhak.comlu.com/get-data.php）;                //取决于你的Web服务
                httppost.setHeader（内容类型，应用/ JSON）;                为InputStream的InputStream = NULL;
                字符串结果= NULL;
                尝试{
                    HTT presponse响应= httpclient.execute（httppost）;
                    HttpEntity实体= response.getEntity（）;                    的InputStream = entity.getContent（）;
                    // JSON默认为UTF-8
                    读者的BufferedReader =新的BufferedReader（新的InputStreamReader（InputStream中，UTF-8），8）;
                    StringBuilder的SB =新的StringBuilder（）;                    串线= NULL;
                    而（（行= reader.readLine（））！= NULL）
                    {
                        sb.append（行+\\ n）;
                    }
                    结果= sb.toString（）;
                }赶上（例外五）{
                    //哎呀
                }
                最后{
                    尝试{如果（InputStream的！= NULL）inputStream.close（）;}赶上（例外挤）{}
                }
                返回结果;
            }
 

解决方案

您的网址是的http：/ /justedhak.comlu.com/get-data.php ，你没，T提到的任何JSON API从它数据u必须做这样的事情
http://justedhak.comlu.com/get-data.php/apiName？参数1 = ...

this is the code .ofcourse the url is returning data.

protected void showList(){
    try {
        JSONObject jsonObj = new JSONObject(myJSON);
        peoples = jsonObj.getJSONArray(TAG_RESULTS);

        for(int i=0;i<peoples.length();i++){
            JSONObject c = peoples.getJSONObject(i);
            String id = c.getString(TAG_ID);
            String url = c.getString(TAG_URL); 
            Listitem.add(new Listitem(id,url));
        }

        GridViewAdapter adapter = new GridViewAdapter(this, R.layout.grid_item_layout, Listitem);
     //   gridView.setAdapter(gridAdapter); 

       list.setAdapter(adapter);

    } catch (JSONException e) {
        e.printStackTrace();
    }

asycntask and url

 protected String doInBackground(String... params) {
                DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
                HttpPost httppost = new HttpPost("http://justedhak.comlu.com/get-data.php");

                // Depends on your web service
                httppost.setHeader("Content-type", "application/json");

                InputStream inputStream = null;
                String result = null;
                try {
                    HttpResponse response = httpclient.execute(httppost);
                    HttpEntity entity = response.getEntity();

                    inputStream = entity.getContent();
                    // json is UTF-8 by default
                    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
                    StringBuilder sb = new StringBuilder();

                    String line = null;
                    while ((line = reader.readLine()) != null)
                    {
                        sb.append(line + "\n");
                    }
                    result = sb.toString();
                } catch (Exception e) {
                    // Oops
                }
                finally {
                    try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
                }
                return result;
            }

解决方案

Your url is http://justedhak.comlu.com/get-data.php", you didn,t mentioned any json api to get data from it u must do something like http://justedhak.comlu.com/get-data.php/apiName?param1=...

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