android - 如何在微调器中设置初始文本而不是 json 响应的第一项

Question

我在我的应用程序中使用 json 解析，我从 json 中获取国家名称，问题出在我的 json 响应中第一个国家是“安道尔”，但默认情况下我想显示“选择国家”，以下是我的 json响应和代码，任何人都可以帮助我吗？？

[{"user_status":"1","country_id":"1","country":"Andorra"},{"user_status":"1","country_id":"2","country":"United Arab Emirates"},{"user_status":"1","country_id":"3","country":"Afghanistan"},{"user_status":"1","country_id":"4","country":"Antigua and Barbuda"},{"user_status":"1","country_id":"5","country":"Anguilla"},{"user_status":"1","country_id":"6","country":"Albania"},{"user_status":"1","country_id":"7","country":"Armenia"},{"user_status":"1","country_id":"8","country":"Angola"},]

我的代码

class Logincity extends
            AsyncTask<String, String, ArrayList<HashMap<String, String>>> {
        private ProgressDialog pDialog;
        private String test;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Registration.this);
            pDialog.setMessage("Please wait..");
            pDialog.setIndeterminate(true);
            pDialog.setIndeterminateDrawable(getResources().getDrawable(R.drawable.custom_progress));
            pDialog.setCancelable(true);
            pDialog.show();
        }
        protected ArrayList<HashMap<String, String>> doInBackground(
                String... args) {
            ServiceHandler sh = new ServiceHandler();
            // Making a request to url and getting response
            citydata = new ArrayList<HashMap<String, String>>();
            String jsonStr = sh.makeServiceCall(CITY_URL, ServiceHandler.GET);
            Log.d("Response: ", "> " + jsonStr);
            if (jsonStr != null) {
                try {
                    jsonObjcitys = new JSONArray(jsonStr);
                    // state_list = jsonObj.getJSONArray(COUNTRY_LIST);
                    // looping through All Contacts
                    for (int i = 0; i < jsonObjcitys.length(); i++) {
                        JSONObject c = jsonObjcitys.getJSONObject(i);
                        // creating new HashMap
                        HashMap<String, String> map = new HashMap<String, String>();
                        // adding each child node to HashMap key => value
                        //map.put(CITY_NAME, c.getString(CITY_NAME));

                        map.put(CITY_NAME, c.getString(CITY_NAME));
                        //  map.put(PRESET_TITLES, c.getString(PRESET_TITLES));
                        citydata.add(map);

                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            } else {
                Log.e("ServiceHandler", "Couldn't get any data from the url");
            }
            return citydata;
        }
        protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
            super.onPostExecute(result);
            pDialog.dismiss();
            arrallcitiies = new String[citydata.size()];
            for (int index = 0; index < citydata.size(); index++) {
                HashMap<String, String> map = citydata.get(index);
                arrallcitiies[index] = map.get(CITY_NAME);
            }
            // pass arrConuntry array to ArrayAdapter<String> constroctor :
            adapterallcities = new ArrayAdapter<String>(
                    Registration.this,
                    android.R.layout.simple_spinner_dropdown_item, arrallcitiies);
            spinrcountry.setAdapter(adapterallcities);

            spinrcountry.setPrompt("Select City");
            spinrcountry.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                    cityspitems = spinrcountry.getSelectedItem().toString();
                    System.out.println("PresetEVent selected" + cityspitems);
                }

                @Override
                public void onNothingSelected(AdapterView<?> adapterView) {
                }
            });




        }
    }

Answer 1

只需要在该数组的第一个位置添加“选择国家/地区”和 length=response items + 1

    arrallcitiies = new String[citydata.size()+1];
    arrallcitiies[0]="Select Country"; //item at pos 0
    int j=1;
    for (int index = 0; index < citydata.size(); index++) {
    HashMap<String, String> map = citydata.get(index);
    arrallcitiies[j++] = map.get(CITY_NAME);
    }

    adapterallcities = new ArrayAdapter<String>(Registration.this,
                        android.R.layout.simple_spinner_dropdown_item, arrallcitiies);
    spinrcountry.setAdapter(adapterallcities);