从JSON下载的变量下载JSON

Question

我需要从服务器下载JSON文件。 一旦下载，我需要运行第二个URL并从那里下载文件。 所有这些都需要在用户看到任何内容之前发生（除了加载对话框）。

我想要的是从url下载JSON并获取姓氏（lname），并获取名字（fname）。 然后我需要构建一个像：http://google.nl/?user=lname&user2=fname的网址。 然后我需要运行该URL，从中获取所有详细信息并在我的listView中显示它（我知道如何做到这一点）。 唯一的问题是我如何实现这一目标？ 我的想法是在onPostExecute中调用一个新方法来调用另一个执行AsyncTask的类，但这没有用...

 @Override
    protected Void doInBackground(Void... arg0) {
        // Creating service handler class instance
        ServiceHandler sh = new ServiceHandler();

        // Making a request to url and getting response
        String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

        Log.d("Response: ", "> " + jsonStr);

        if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting JSON Array node
                contacts = jsonObj.getJSONArray(TAG_CONTACTS);
                JSONObject first = contacts.getJSONObject(1);
                String lastname = first.getString(TAG_LASTNAME);
                String firstname = first.getString(TAG_FIRSTNAME);

                if(lastname != null){
                    url1 = "http://project-hr.nl/serviceview.php?&email="+lastname+"&pass="+firstname;
                    ServiceHandler sh1 = new ServiceHandler();
                    String jsonStrShare = sh1.makeServiceCall(url1, ServiceHandler.GET);
                    try {
                        JSONObject jsonObj1 = new JSONObject(jsonStrShare);
                        contacts1 = jsonObj1.getJSONArray(TAG_CONTACTS);
                // looping through All Contacts
                for (int i = 0; i < contacts.length(); i++) {
                    JSONObject c = contacts.getJSONObject(i);

                    String id = c.getString(TAG_FIRSTNAME);
                    String lastsharename = c.getString(TAG_LASTNAME);
                    String email = c.getString(TAG_EMAIL);
                    String list = c.getString(TAG_LIST);
                    String tussenv = c.getString(TAG_TUSSENV);
                    String pass = c.getString(TAG_PASS);
                    String phone = c.getString(TAG_PHONENUMBER);

                    // tmp hashmap for single contact
                    HashMap<String, String> contact = new HashMap<String, String>();

                    // adding each child node to HashMap key => value
                    contact.put(TAG_FIRSTNAME, id);
                    contact.put(TAG_LASTNAME, lastsharename);
                    contact.put(TAG_EMAIL, email);
                    contact.put(TAG_LIST, list);
                    contact.put(TAG_TUSSENV, tussenv);
                    contact.put(TAG_PASS, pass);
                    contact.put(TAG_PHONENUMBER, phone);
                    //contact.put(TAG_PHONE_MOBILE, mobile);

                    // adding contact to contact list
                    contactList.add(contact);

                }

            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }

        return null;
    }
        }

Answer 1

对于那些有同样问题的人。这是用于下载JSON并使用第一个JSON参数再次下载JSON的代码。

 @Override
    protected Void doInBackground(Void... arg0) {
        // Creating service handler class instance
        ServiceHandler sh = new ServiceHandler();

        // Making a request to url and getting response
        String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

        Log.d("Response: ", "> " + jsonStr);

        if (!jsonStr.isEmpty()) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting JSON Array node
                contacts = jsonObj.getJSONArray(TAG_CONTACTS);
                JSONObject first = contacts.getJSONObject(0);
                Log.d("response lastname ", first.getString("lname"));
                Log.d("response firstname ", first.getString("fname"));
                String lastname = first.getString("lname");
                String firstname = first.getString("fname");
                Log.i("check if empty", ""+lastname);
                if(!lastname.isEmpty()){
                    url1 = "SPECIFY URL";//Put URL there
                    ServiceHandler sh1 = new ServiceHandler();
                    String jsonStrShare = sh1.makeServiceCall(url1, ServiceHandler.GET);
                        JSONObject jsonObj1 = new JSONObject(jsonStrShare);
                        contacts1 = jsonObj1.getJSONArray(TAG_CONTACTS);
                // looping through All Contacts
                for (int i = 0; i < contacts1.length(); i++) {
                    JSONObject c = contacts1.getJSONObject(i);

                    String id = c.getString(TAG_FIRSTNAME);
                    String lastsharename = c.getString(TAG_LASTNAME);
                    String email = c.getString(TAG_EMAIL);
                    String list = c.getString(TAG_LIST);
                    String tussenv = c.getString(TAG_TUSSENV);
                    String pass = c.getString(TAG_PASS);
                    String phone = c.getString(TAG_PHONENUMBER);

                    // tmp hashmap for single contact
                    HashMap<String, String> contact = new HashMap<String, String>();

                    // adding each child node to HashMap key => value
                    contact.put(TAG_FIRSTNAME, id);
                    contact.put(TAG_LASTNAME, lastsharename);
                    contact.put(TAG_EMAIL, email);
                    contact.put(TAG_LIST, list);
                    contact.put(TAG_TUSSENV, tussenv);
                    contact.put(TAG_PASS, pass);
                    contact.put(TAG_PHONENUMBER, phone);
                    //contact.put(TAG_PHONE_MOBILE, mobile);

                    // adding contact to contact list
                    contactList.add(contact);

                }
                }   
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }

        return null;
    }