android应用程序中的JSON解析答案

【问题标题】：JSON parsing in android appandroid应用程序中的JSON解析
【发布时间】：2013-03-04 09:37:44
【问题描述】：

该网址有以下视图源。我需要解析和获取为“Folio”提供的图像路径。请任何人指导如何获取以下路径的数组。提前谢谢

     {"SEO":

  {"Marketing":["http://www.tts.com/media/imagepath/Web.jpg","http://www.tts.com/imagepath/ranks.jpg"],
      "Folio":["http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_a_grade_motor_school.html_a_poftfolio_2013_01_11.png",
                                   "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_abc_tarps.html_a_poftfolio_2013_01_10.png",
                                              "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_able_scale.html_a_poftfolio_2013_01_10.png",
                                              "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_accent_aluminum_windows.html_a_poftfolio_2013_01_10.png",
                                              "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_access_health.html_a_poftfolio_2013_01_10.png",
                                              "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_acmeda__zipscreen.html_a_poftfolio_2013_01_11.png",
                                              "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_aditya_birla_minerals.html_a_poftfolio_2013_01_10.png",
                                              "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_advanced_corporate_badges.html_a_poftfolio_2013_01_10.png",
                                              "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_aerotech_fans.html_a_poftfolio_2013_01_10.png",
                                              "http://www.tts.com/media/imagepath/portfolio_images/http_arctictern.t.com.au_folio_portfolio_agriculture_victoria_services_.html_a_poftfolio_2013_01_10.png"]},

 "Services":{"Hosting":["http://www.tts.com/media/imagepath/hostinga.jpg","http://www.tts.com/media/imagepath/hostingb.jpg"],

  "Mobile Apps":["http://www.tts.com/media/imagepath/mobileapp.jpg","http://www.tts.com/media/imagepath/mobilesite.jpg"]

}


}

JSON 解析器类包含

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";

    // constructor
    public JSONParser() {

    }

    public JSONObject getJSONFromUrl(String url) {

        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();           

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();

        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;

    }
}

主要活动包含

     public class AndroidJSONParsingActivity extends ListActivity {

    private static String url = "http://www.xyz.com/album_pro/array_to_encode";
    private static final String TAG_FOLIO = "SEO";
     JSONArray folio = null;
     @SuppressLint("NewApi")
    public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
              StrictMode.setThreadPolicy(policy);

            JSONParser jParser = new JSONParser();


            try{

                JSONObject json = jParser.getJSONFromUrl(url);
                Log.v("URL",json.toString());
            JSONObject seo = json.getJSONObject("SEO");
            Log.v("seo",seo.toString());
            JSONArray folio = json.getJSONArray("Folio");

            for(int i=0;i< folio.length();i++)
            {
                Log.v("Test", "test");
            }


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

}
}

在 logcat 文件中运行应用程序后得到的错误如下

03-04 15:36:50.458: W/System.err(23230): org.json.JSONException: No value for Folio
03-04 15:36:50.458: W/System.err(23230):    at org.json.JSONObject.get(JSONObject.java:354)
03-04 15:36:50.458: W/System.err(23230):    at org.json.JSONObject.getJSONArray(JSONObject.java:544)
03-04 15:36:50.458: W/System.err(23230):    at com.example.testgallery.AndroidJSONParsingActivity.onCreate(AndroidJSONParsingActivity.java:37)
03-04 15:36:50.458: W/System.err(23230):    at android.app.Activity.performCreate(Activity.java:5008)
03-04 15:36:50.458: W/System.err(23230):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
03-04 15:36:50.458: W/System.err(23230):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)

【问题讨论】：

您提供的json无效。
@AnujMathur_07 有效，格式为 ??
现在看来是有效的。

标签： java android json parsing arrays

【解决方案1】：

首先创建一个类似...的ArrayList

ArrayList<String> urlList = new ArrayList<String>();

从 JSONObject Marketing 获取 Folio JSONArray，例如...

JSONArray folio = marketing.getJSONArray("Folio");

现在将所有项目从 folio 放到 urlList 中，例如...

for(int i=0;i<folio.length();i++){
  urlList.add(folio.getString(i));
}

现在你可以使用这个 urlList。

【讨论】：

【解决方案2】：

试试这个

JSONObject json = jParser.getJSONFromUrl(url);
JSONObject seoObj = jObj.getJSONObject("SEO");
JSONArray folioArr = seoObj.getJSONArray("Folio");
ArrayList<String> image_urls = new ArrayList<String>();
for (int i = 0; i < folioArr.length(); i++) {
image_urls.add(folioArr.getString(i));
}

【讨论】：

【解决方案3】：

假设您在名为 stringSource 的 String 变量中有此 JSON。

JSONObject json = new JSONObject(stringSource);
JSONObject seo = json.getJSONObject("SEO");
JSONArray folio = json.getJSONArray("Folio");

然后使用JSONArray.getString(int index) 从数组中检索每个 URL。

【讨论】：

【解决方案4】：

将您的回复转换为String

然后

JSONObject json = new JSONObject(response.toString());
//Since Folio is an array
JSONArray folio = json.getJSONArray("Folio");
//Get Individual Links
for(int i=0;i<folio.length();i++){
   //Fetch Your Code Here
   String image = folio.getString(i);

}

注意：我认为您收到了无效的 JSON 响应。我检查了你的回复here

【讨论】：

【解决方案5】：

参加这门课

    public class GettingResponseFromUrl {

    public static String convertStreamToString(InputStream inputStream)
            throws IOException {
        if (inputStream != null) {
            StringBuilder sb = new StringBuilder();
            String line;
            try {
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(inputStream, "UTF-8"));
                while ((line = reader.readLine()) != null) {
                    sb.append(line).append("\n");
                }
            } finally {
                inputStream.close();
            }
            return sb.toString();
        } else {
            return "";
        }
    }

    public static String GetDataFromServer(String url, String method) {
        url = url.replace(" ", "%20");
        String Root_Response = null;
        try {
            HttpParams basicparams = new BasicHttpParams();
            int timeoutConnection = 120000;
            HttpConnectionParams.setConnectionTimeout(basicparams,
                    timeoutConnection);
            DefaultHttpClient client = new DefaultHttpClient(basicparams);
            URI uri = new URI(url);
            HttpResponse res = null;
            if (method.equalsIgnoreCase("POST")) {
                HttpPost httpPost = new HttpPost(uri);
                res = client.execute(httpPost);
            } else if (method.equalsIgnoreCase("GET")) {
                HttpGet httpGet = new HttpGet(uri);
                res = client.execute(httpGet);
            }
            InputStream data = res.getEntity().getContent();
            Root_Response = convertStreamToString(data);

        } catch (ClientProtocolException e) {
        } catch (IOException e) {
            e.printStackTrace();
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
        return Root_Response;
    }

}

//比从下面的代码调用网络服务

new GettingData().execute();

    private class GettingData extends AsyncTask<String, String, String> {

        private ProgressDialog progressDialog;
            private String response;

        @Override
        protected void onPreExecute() {

            super.onPreExecute();
            progressDialog = new ProgressDialog(mContext);
            progressDialog.setMessage("Loading ...");
            progressDialog.setIndeterminate(false);
            progressDialog.setCancelable(true);
            progressDialog.show();

        }

        @Override
        protected String doInBackground(String... args) {
try {
            Response = GettingResponseFromUrl
                    .GetDataFromServer(URL, "POST");
            Log.e("Response", Response);
        } catch (Exception e) {
        }
            runOnUiThread(new Runnable() {
                @Override
                public void run() {


                }
            });
            return null;
        }

        @Override
        protected void onPostExecute(String args) {
            progressDialog.dismiss();

        }
    }

【讨论】：

【解决方案6】：

看看这个免费提供的工具

Android Class Creator tool

它的教程是它。它非常易于使用。

【讨论】：