Android 4.0 JSON失败

Question

我正在尝试使用Android 4.0或更高版本中的HTTPCLient从JSON格式的网页获取数据。问题是httpclient成功获取了链接“http://extjs.org.cn/extjs/examples/grid/survey.html”的数据，但是我创建的页面“http://192.168.x.xxx:8888/xampp/jsonTest.php?type=1”和JSON页面输出失败了：

  

{“网络”：“好”}

有谁知道问题是什么？如果没有，是否有另一种方法可以使用我自己的页面读取JSON。

这是我写的代码。

public class MainActivity extends Activity {

    public EditText edit;

    public String readJSONFeed(String URL) {
        StringBuilder stringBuilder = new StringBuilder();
        HttpClient client = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(URL);
        try {
            HttpResponse response = client.execute(httpGet);
            StatusLine statusLine = response.getStatusLine();
            int statusCode = statusLine.getStatusCode();
            if (statusCode == 200) {
                HttpEntity entity = response.getEntity();
                InputStream content = entity.getContent();
                BufferedReader reader = new BufferedReader(
                new InputStreamReader(content));
                String line;
                while ((line = reader.readLine()) != null) {
                    stringBuilder.append(line);
                }
            } else {
                Log.e("JSON", "Failed to download file");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return stringBuilder.toString();
    }

    private class ReadJSONFeedTask extends AsyncTask<String, Void, String> {
        protected String doInBackground(String... urls) {
            return readJSONFeed(urls[0]);
        }

        protected void onPostExecute(String result) {
            try {
                JSONArray jsonArray = new JSONArray(result);
                Log.i("JSON", "Number of surveys in feed: " + jsonArray.length());
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    Toast.makeText(getBaseContext(), jsonObject.getString("Network"),Toast.LENGTH_SHORT).show();
                    edit.setText("Check :" + jsonObject.getString("Network"));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }       
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edit = (EditText)findViewById(R.id.result1);
        new ReadJSONFeedTask().execute("http://192.168.x.xxx:8888/xampp/jsonTest.php?type=1");
        //new ReadJSONFeedTask().execute("http://extjs.org.cn/extjs/examples/grid/survey.html");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }    
}

PS。我完成了Internet访问权限