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如何从URL中获取价值和微调器中设置名称和发送选择的值id到服务器中的片段

本文介绍了如何从URL中获取价值和微调器中设置名称和发送选择的值id到服务器中的片段的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我是新的Andr​​oid开发人员我是从网​​址获取数据并希望在微调设置名称，并发送其ID到服务器

我的JSON 

  {
数据：[{
    名：倚CDMA
    ID为1
}，{
    名：IDEA
    ID：5
}，{
    名：AIRTEL
    ID：7
}，{
    名：MTNL DELHI
    ID：8
}，{
    名：MTNL孟买
    ID：8
}，{
    名：VODAFONE
    ID：12
}，{
    名：循环，
    ID：13
}，{
    名：BSNL
    ID：14
}，{
    名：商Aircel
    ID：19
}，{
    名：TATA Indicom的
    ID：23
}，{
    名：VIRGIN CDMA
    ID：27
}，{
    名：倚GSM
    ID：32
}，{
    名：塔塔Docomo
    ID：35
}，{
    名：VIRGIN GSM
    ID：36
}，{
    名：MTS
    ID：38
}，{
    名：UNINOR
    ID：41
}，{
    名：VIDEOCON
    ID：43
}，{
    名：T24
    ID：52
}]
}

和我使用这个code
在android系统

code 

 私有类DownloadJSON扩展的AsyncTask＆LT;太虚，太虚，太虚＆GT; {
    保护无效doInBackground（虚空...... PARAMS）{
        json_data =新的ArrayList＆LT; Json_Data＆GT;（）;
        DataList控件=新的ArrayList＆LT;串GT;（）;
        的JSONObject = JSONfunctions
                .getJSONfromURL（http://www.myurl.com/index.php）;只有//例子
        Log.d（回应：，＆gt;中+的JSONObject）;
        尝试{
            jsonarray = jsonobject.getJSONArray（数据）;
            的for（int i = 0; I＆LT; jsonarray.length（）;我++）{
                的JSONObject = jsonarray.getJSONObject（ⅰ）;
                Json_Data worldpop =新Json_Data（）;
                worldpop.setName（jsonobject.optString（名字））;
                worldpop.setId（jsonobject.optString（ID））;
                json_data.add（worldpop）;
                datalist.add（jsonobject.optString（名字））;
            }
        }赶上（例外五）{
            Log.e（错误，e.getMessage（））;
            e.printStackTrace（）;
        }
        返回null;
    }
    保护无效onPostExecute（无效参数）{        微调mySpinner =（微调）getView（）findViewById（R.id.operator_spinner）。
        mySpinner
                .setAdapter（新ArrayAdapter＆LT;串GT;（getActivity（）
                        android.R.layout.simple_spinner_dropdown_item，
                        DataList控件））;
        mySpinner
                .setOnItemSelectedListener（新AdapterView.OnItemSelectedListener（）{
                    公共无效onItemSelected（适配器视图＆LT;＆GT;为arg0，
                                               查看ARG1，INT位置，长ARG3）{
                        字符串opt_ code = datalist.get（位置）;
                    }                    公共无效onNothingSelected（适配器视图＆LT;＆GT;为arg0）{
                        // TODO自动生成方法存根
                    }
                }）;
    }
}

但这种code只显示微调的名字，但没有选择任何ID形成的json


解决方案

它应该是：

 私有类DownloadJSON扩展的AsyncTask＆LT;太虚，太虚，太虚＆GT; {
    保护无效doInBackground（虚空...... PARAMS）{
        json_data =新的ArrayList＆LT; Json_Data＆GT;（）;
        DataList控件=新的ArrayList＆LT;对＆LT;字符串，字符串＆GT;＆GT;（）;
        的JSONObject = JSONfunctions
                .getJSONfromURL（http://www.myurl.com/index.php）;只有//例子
        Log.d（回应：，＆gt;中+的JSONObject）;
        尝试{
            jsonarray = jsonobject.getJSONArray（数据）;
            的for（int i = 0; I＆LT; jsonarray.length（）;我++）{
                的JSONObject = jsonarray.getJSONObject（ⅰ）;
                Json_Data worldpop =新Json_Data（）;
                worldpop.setName（jsonobject.optString（名字））;
                worldpop.setId（jsonobject.optString（ID））;
                json_data.add（worldpop）;
                datalist.add（新配对＆LT;字符串，字符串＆GT;（jsonobject.optString（ID），jsonobject.optString（名字））;
            }
        }赶上（例外五）{
            Log.e（错误，e.getMessage（））;
            e.printStackTrace（）;
        }
        返回null;
    }    保护无效onPostExecute（无效参数）{
        微调mySpinner =（微调）getView（）findViewById（R.id.operator_spinner）。
        mySpinner
                .setAdapter（新ArrayAdapter＆LT;串GT;（getActivity（）
                        android.R.layout.simple_spinner_dropdown_item，
                        DataList控件））;
        mySpinner
                .setOnItemSelectedListener（新AdapterView.OnItemSelectedListener（）{
                    公共无效onItemSelected（适配器视图＆LT;＆GT;为arg0，
                                               查看ARG1，INT位置，长ARG3）{
                        字符串opt_ code = datalist.get（位置）。首先，
                    }                    公共无效onNothingSelected（适配器视图＆LT;＆GT;为arg0）{
                        // TODO自动生成方法存根
                    }
                }）;
    }
}

但在我看来，你不明白这是怎么回事在code，所以强烈建议在理清。

和多了一个建议 - don'y使用的AsyncTask，并采取

I am new in android dev i am fetch data from URL and want to set name in spinner and send their id to server

MY 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"
}]
}

and i am using this code in android

CODE

 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
                    }
                });
    }


}

but this code only show name in spinner but not select any id form my json

解决方案

It should be:

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
                    }
                });
    }
}

But it seems to me that you don't understand what's going on in that code, so highly suggest to sort out in that.

And one more advice - don'y use AsyncTask, and take a look on Retrofit.

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11-02 00:49
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