Question

我有两个微调器“ Route”和“ Station”，第二个微调器依赖于第一个微调器，因此我开发了代码，该代码可以正常工作，但是现在我需要获取第二个微调器的选定值（Station ）并将其发送到另一个网址服务器（php）// http://localhost/Android/v1/test1.php 但是我没有找到解决方案。

我尝试使用routeSpinner进行操作，但是我没有得到所选的值，所以它不起作用。

 spinnerStation = (Spinner)findViewById(R.id.spinnerStation);
 spinnerRoute = (Spinner)findViewById(R.id.spinnerRoute);
 stationList = new ArrayList<Station>();

 spinnerRoute.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            // Refresh Spinner
            stationList.clear();
            new GetStationFromServer().execute();
        }
        @Override
        public void onNothingSelected(AdapterView<?> parent) {
        }
    });

    private class GetStationFromServer extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(ProfileActivity.this); 
        pDialog.setMessage("Fetching Data");
        pDialog.show();

    }

    @Override
    protected Void doInBackground(Void... arg0) {
        routeName = spinnerRoute.getSelectedItem().toString();



        Handler jsonParser = new Handler();


        String json = jsonParser.makeServiceCall("http://192.168.1.2/   Android/v1/get_station.php?route="+routeName, Handler.GET);

        Log.e("Response: ", "> " + json);



        if (json != null) {
            try {

                JSONObject jsonObj = new JSONObject(json);
                if (jsonObj != null) {
                    JSONArray station = jsonObj
                            .getJSONArray("station");

                    for (int i = 0; i < station.length(); i++) {
                        JSONObject modObj =(JSONObject)station.get(i);
                        Station mod = new Station  (    modObj.getString("station"));
                        stationList.add(mod);
                    }
                }

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

        } else {
            Log.e("JSON Data", "Didn't receive any data from server!");
        }

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        if (pDialog.isShowing())
            pDialog.dismiss();
        populateSpinnerStation();
    }
}

private void populateSpinnerStation() {
    List<String> lables = new ArrayList<String>();

    for (int i = 0; i < stationList.size(); i++) {
        lables.add(stationList.get(i).getStation());
    }

    // Creating adapter for spinner
    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, lables);

    // Drop down layout style - list view with radio button
    spinnerAdapter
            .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    // attaching data adapter to spinner
    spinnerStation.setAdapter(spinnerAdapter);
}

我希望像将路由微调器一样将选定的站点微调器传递给服务器，然后继续我的应用程序，但是它显示错误“未定义索引”

Answer 1

您是否尝试过将字符串显式传递给AsyncTask，而不是要求Async任务查找选定的字符串？

在路由微调器侦听器中类似：

spinnerRoute.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        // Refresh Spinner
        stationList.clear();
        routeName = spinnerRoute.getSelectedItem().toString();
        new GetStationFromServer().execute(routeName);
    }

并将异步任务更改为：

  private class GetStationFromServer extends AsyncTask<String, Void, Void> {

@Override
protected Void doInBackground(String... params) {   
    String s = params[0];
    Handler jsonParser = new Handler();
    String json = jsonParser.makeServiceCall("http://192.168.1.2/  
    Android/v1/get_station.php?route="+s, Handler.GET);
}

如何将选定的微调器值传递到其他网址

1 个答案: