Unable to POST data on Server mysqli/Php in android

Question

I am just trying to post data on server. This gives no error but data is not getting inserted. I checked using the GET method by directly accessing the php page, it works but when i run the application, it does not work.

PHP Script:



<?php               
        $conn=mysqli_connect("localhost","my_user","my_password","my_db");

                $name=$_POST["name"];
                $age=$_POST["age"];
                $userName=$_POST["userName"];
                $password=$_POST["password"];

                $statement=mysqli_prepare($conn,"INSERT INTO User (name,age,UserName,password) VALUES (?,?,?,?)");
                mysqli_stmt_bind_param($statement,"siss",$name,$age,$userName,$password);
                mysqli_stmt_execute($statement);
                mysqli_stmt_close($statement);
                mysqli_close($conn);

            ?>

But when i manually test it using GET method like http://test.com?user=user1&age=11&userName=wer45&password=23ssds

and change the php scripts as :

<?php   
    $conn=mysqli_connect("localhost","my_user","my_password","my_db");

    $name=$_GET["name"];
    $age=$_GET["age"];
    $userName=$_GET["userName"];
    $password=$_GET["password"];

    $statement=mysqli_prepare($conn,"INSERT INTO User (name,age,UserName,password) VALUES (?,?,?,?)");
    mysqli_stmt_bind_param($statement,"siss",$name,$age,$userName,$password);
    mysqli_stmt_execute($statement);
    mysqli_stmt_close($statement);
    mysqli_close($conn);

?>

Here the above GET works, Can anyone check the below code and help me identify the issue here. i am not able to track as there is no error thrown.

public class storeUserDataAsyncTask extends AsyncTask<Void,Void,Void>{
        User user;
        GetUserCallBack userCallBack;

        public storeUserDataAsyncTask(User user,GetUserCallBack userCallBack){
            this.user=user;
            this.userCallBack=userCallBack;
        }
        @Override
        protected Void doInBackground(Void... params) {
            HashMap<String,String> dataToSend=new HashMap<>();
            dataToSend.put("name", user.name);
            dataToSend.put("age",user.age+"");
            dataToSend.put("userName",user.userName);
            dataToSend.put("password",user.password);
            HttpURLConnection httpURLConnection=null;
            try {
                URL url = new URL("http://nishantapp11.esy.es/Register.php");
                httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.setConnectTimeout(10000);
                httpURLConnection.setReadTimeout(10000);
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                //httpURLConnection.setChunkedStreamingMode(0);

                int serverResponseCode=httpURLConnection.getResponseCode();
                if(serverResponseCode==HttpURLConnection.HTTP_OK){

                }else{
                    Log.e("TAG","not ok");
                }

                OutputStreamWriter outputStreamWriter=new OutputStreamWriter(httpURLConnection.getOutputStream());
                outputStreamWriter.write(getPostDataString(dataToSend));
                outputStreamWriter.flush();

               /* OutputStream outputStream=httpURLConnection.getOutputStream();


                BufferedWriter bufferedWriter=new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
                bufferedWriter.write(getPostDataString(dataToSend));
                bufferedWriter.flush();
                bufferedWriter.close();*/

            }catch (Exception e){
                e.printStackTrace();
            }
            finally {
                httpURLConnection.disconnect();
            }
            return null;
         }

        @Override
        protected void onPostExecute(Void aVoid) {
            progressDialog.dismiss();
            userCallBack.done(null);
            super.onPostExecute(aVoid);
        }
        private String getPostDataString(HashMap<String,String> params) throws UnsupportedEncodingException{

            StringBuilder result=new StringBuilder();
            boolean first =true;
            for(HashMap.Entry<String,String> entry:params.entrySet()) {
                if (first)
                    first = false;
                else
                    result.append("&");

                result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
                result.append("=");
                result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));

            }
            //Log.e("POST URL", result.toString());
            return result.toString();

        }
    }

Answer 1

Looking at a sample HTTPURLConnection , there's a httpURLConnection.connect(); at the end which I do not see in your code.

Note that your code has httpURLConnection.disconnect(); in the catch part of the exception.

Disclaimer: Assuming you code is complete and I'm correct

Had you actually used wireshark, you would have seen no traffic coming out of your emulator. This is why it's a very useful tool. It can provide information when your code has no errors or exceptions, but is just missing something.