java-Android JSONArray到ArrayList

概述我正在尝试在我的Android应用程序中将JSONArray解析为和ArrayList.PHP脚本正确地重新调整了预期的结果,但是Java失败,并在resultsList.add(map)处出现了空指针异常publicvoidagencySearch(Stringtsearch){//SettingtheURLfortheSearchbyTownSt

我正在尝试在我的Android应用程序中将JsONArray解析为和ArrayList. PHP脚本正确地重新调整了预期的结果,但是Java失败,并在resultsList.add(map)处出现了空指针异常

public voID agencySearch(String tsearch)    {        // Setting the URL for the Search by Town        String url_search_agency = "http://www.infinitycodeservices.com/get_agency_by_city.PHP";        // Building parameters for the search        List<nameValuePair> params = new ArrayList<nameValuePair>();        params.add(new BasicnameValuePair("City", tsearch));        // Getting JsON string from URL        JsONArray Json = jParser.getJsONFromUrl(url_search_agency, params);        for (int i = 0; i < Json.length(); i++) {            HashMap<String, String> map = new HashMap<String, String>();            try {                JsONObject c = (JsONObject) Json.get(i);                //Fill map                Iterator iter = c.keys();                while(iter.hasNext())   {                    String currentKey = (String) iter.next();                    map.put(currentKey, c.getString(currentKey));                }                resultsList.add(map);            }            catch (JsONException e) {                e.printstacktrace();            }        };        MainActivity.setResultsList(resultsList);    }

解决方法:

尝试这样可能会帮助您,

public voID agencySearch(String tsearch)    {        // Setting the URL for the Search by Town        String url_search_agency = "http://www.infinitycodeservices.com/get_agency_by_city.PHP";        // Building parameters for the search        List<nameValuePair> params = new ArrayList<nameValuePair>();        params.add(new BasicnameValuePair("City", tsearch));        // Getting JsON string from URL        JsONArray Json = jParser.getJsONFromUrl(url_search_agency, params);       ArrayList<HashMap<String, String>> resultsList = new  ArrayList<HashMap<String, String>>();        for (int i = 0; i < Json.length(); i++) {            HashMap<String, String> map = new HashMap<String, String>();            try {                JsONObject c = Json.getJsONObject(position);                //Fill map               Iterator<String> iter = c.keys();                while(iter.hasNext())   {                    String currentKey = it.next();                    map.put(currentKey, c.getString(currentKey));                }                resultsList.add(map);            }            catch (JsONException e) {                e.printstacktrace();            }        };        MainActivity.setResultsList(resultsList);    }

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