android - 如何从 URL 获取值并在微调器中设置名称并将选择值 id 发送到 fragment 中的服务器

Question

我是 android 开发新手，我正在从 URL 获取数据，并想在微调器中设置名称并将其 id 发送到服务器

我的 JSON

{
"data": [{
    "name": "RELIANCE CDMA",
    "ID": "1"
}, {
    "name": "IDEA",
    "ID": "5"
}, {
    "name": "AIRTEL",
    "ID": "7"
}, {
    "name": "MTNL DELHI",
    "ID": "8"
}, {
    "name": "MTNL MUMBAI",
    "ID": "8"
}, {
    "name": "VODAFONE",
    "ID": "12"
}, {
    "name": "LOOP",
    "ID": "13"
}, {
    "name": "BSNL",
    "ID": "14"
}, {
    "name": "AIRCEL",
    "ID": "19"
}, {
    "name": "TATA INDICOM",
    "ID": "23"
}, {
    "name": "VIRGIN CDMA",
    "ID": "27"
}, {
    "name": "RELIANCE GSM",
    "ID": "32"
}, {
    "name": "TATA DOCOMO",
    "ID": "35"
}, {
    "name": "VIRGIN GSM",
    "ID": "36"
}, {
    "name": "MTS",
    "ID": "38"
}, {
    "name": "UNINOR",
    "ID": "41"
}, {
    "name": "VIDEOCON",
    "ID": "43"
}, {
    "name": "T24",
    "ID": "52"
}]
}

我正在使用这段代码在安卓中

代码

 private class DownloadJSON extends AsyncTask<Void, Void, Void> {
    protected Void doInBackground(Void... params) {
        json_data = new ArrayList<Json_Data>();
        datalist = new ArrayList<String>();
        jsonobject = JSONfunctions
                .getJSONfromURL("http://www.myurl.com/index.php");    // example only
        Log.d("Response: ", "> " + jsonobject);
        try {
            jsonarray = jsonobject.getJSONArray("data");
            for (int i = 0; i < jsonarray.length(); i++) {
                jsonobject = jsonarray.getJSONObject(i);
                Json_Data worldpop = new Json_Data();
                worldpop.setName(jsonobject.optString("name"));
                worldpop.setId(jsonobject.optString("ID"));
                json_data.add(worldpop);
                datalist.add(jsonobject.optString("name"));
            }
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return null;
    }
    protected void onPostExecute(Void args) {

        Spinner mySpinner = (Spinner)getView().findViewById(R.id.operator_spinner);
        mySpinner
                .setAdapter(new ArrayAdapter<String>(getActivity(),
                        android.R.layout.simple_spinner_dropdown_item,
                        datalist));
        mySpinner
                .setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    public void onItemSelected(AdapterView<?> arg0,
                                               View arg1, int position, long arg3) {
                        String opt_code = datalist.get(position);
                    }

                    public void onNothingSelected(AdapterView<?> arg0) {
                        // TODO Auto-generated method stub
                    }
                });
    }


}

但此代码仅在微调器中显示名称，但未从我的 json 中选择任何 ID

Answer 1

应该是:

private class DownloadJSON extends AsyncTask<Void, Void, Void> {
    protected Void doInBackground(Void... params) {
        json_data = new ArrayList<Json_Data>();
        datalist = new ArrayList<Pair<String, String>>();
        jsonobject = JSONfunctions
                .getJSONfromURL("http://www.myurl.com/index.php");    // example only
        Log.d("Response: ", "> " + jsonobject);
        try {
            jsonarray = jsonobject.getJSONArray("data");
            for (int i = 0; i < jsonarray.length(); i++) {
                jsonobject = jsonarray.getJSONObject(i);
                Json_Data worldpop = new Json_Data();
                worldpop.setName(jsonobject.optString("name"));
                worldpop.setId(jsonobject.optString("ID"));
                json_data.add(worldpop);
                datalist.add(new Pair<String, String>(jsonobject.optString("ID"), jsonobject.optString("name"));
            }
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return null;
    }

    protected void onPostExecute(Void args) {
        Spinner mySpinner = (Spinner) getView().findViewById(R.id.operator_spinner);
        mySpinner
                .setAdapter(new ArrayAdapter<String>(getActivity(),
                        android.R.layout.simple_spinner_dropdown_item,
                        datalist));
        mySpinner
                .setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    public void onItemSelected(AdapterView<?> arg0,
                                               View arg1, int position, long arg3) {
                        String opt_code = datalist.get(position).first;
                    }

                    public void onNothingSelected(AdapterView<?> arg0) {
                        // TODO Auto-generated method stub
                    }
                });
    }
}

但在我看来，您不了解该代码中发生的事情，因此强烈建议对其进行梳理。

还有一个建议 - 不要使用 AsyncTask，看看 Retrofit .