如何在PHP中从Android获取值

我正在尝试为android实现服务器端。第四，在安卓我使用这个代码：

    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
        // Get the deviceID
        nameValuePairs.add(new BasicNameValuePair("reg_id", val[1]));
        nameValuePairs.add(new BasicNameValuePair("App_Name",val[2]));
        nameValuePairs.add(new BasicNameValuePair("App_Version", val[3]));

现在在服务器端，我想访问这些值并将其存储在数据库中。我的php代码：

include('connectdb.php');
$Reg_ID=$_REQUEST['reg_id'];
$App_Name=$_REQUEST['App_Name'];
$App_Version=$_REQUEST['App_Version'];
    
if($_REQUEST['reg_id']!='NULL' && $_REQUEST['App_Name']!='NULL' && $_REQUEST['App_Version']!='NULL')
{   
    mysqli_query($con,"INSERT INTO  registration (Reg_ID, APP_Name,App_Version)
    VALUES ('".$_REQUEST['reg_id']."', '".$_REQUEST['App_Name']."','".$_REQUEST['App_Version']."')");
}   
else
{
}   
mysqli_close($con);

但在php中，我得到了以下错误：

注意：上的C:''examplep''htdocs''GCM''addReg.php中的未定义索引：reg_id第5行

注意：未定义的索引：上的C:''examplep''htdocs''GCM''addReg.php中的App_Name第6行

注意：未定义的索引：C:''examplep''htdocs''GCM''addReg.php中的App_Version在线7

警告：mysqli_close((要求参数1为mysqli，resource在第24行上的C:''examplep''htdocs''GCM''addReg.php中给出

有什么帮助吗

编辑

public class SendMail extends AsyncTask<String, String, String> {
    private String endResult;
    HttpResponse response;

    @Override
    protected String doInBackground(String... val) {
        String url=val[0];
        //Log.i("Url", url + "");
        //  Log.d("C2DM", "Sending registration ID to my application server");
        HttpPost post = new HttpPost(url);

        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
    
        nameValuePairs.add(new BasicNameValuePair("reg_id", val[1]));
        nameValuePairs.add(new BasicNameValuePair("App_Name",val[2]));
        nameValuePairs.add(new BasicNameValuePair("App_Version", val[3]));




        HttpParams httpParameters = new BasicHttpParams();
        // Set the timeout in milliseconds until a connection is established.
        int timeoutConnection = 30000;
        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
        // Set the default socket timeout (SO_TIMEOUT) 
        // in milliseconds which is the timeout for waiting for data.
        int timeoutSocket = 30000;
        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
        DefaultHttpClient hc = new DefaultHttpClient(httpParameters);
        ResponseHandler<String> res = new BasicResponseHandler();


        try {
            post.addHeader("Content-Type","application/x-www-form-urlencoded");
            post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            response = hc.execute(post);
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }
    @Override
    protected void onPostExecute(String result) {
        Log.i("endResult", "" + endResult);
        super.onPostExecute(result);

        publishProgress(endResult);
    }
    @Override
    protected void onProgressUpdate(String... values) {
        super.onProgressUpdate(values);
        String result = values[0];

    }
}

(超时代码基于kuester2000的此答案(