Send post request using Volley and receive in PHP

Had a lot of problems myself, try this !

public class CustomRequest extends Request<JSONObject> {private Listener<JSONObject> listener;private Map<String, String> params;public CustomRequest(String url,Map<String, String> params, Listener<JSONObject> responseListener, ErrorListener errorListener) {    super(Method.GET, url, errorListener);    this.listener = responseListener;    this.params = params;}public CustomRequest(int method, String url,Map<String, String> params, Listener<JSONObject> reponseListener, ErrorListener errorListener) {    super(method, url, errorListener);    this.listener = reponseListener;    this.params = params;}@Overrideprotected Map<String, String> getParams() throws com.android.volley.AuthFailureError {    return params;};@Overrideprotected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {    try {        String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers));        return Response.success(new JSONObject(jsonString), HttpHeaderParser.parseCacheHeaders(response));    } catch (UnsupportedEncodingException e) {        return Response.error(new ParseError(e));    } catch (JSONException je) {        return Response.error(new ParseError(je));    }}@Overrideprotected void deliverResponse(JSONObject response) {    listener.onResponse(response);}

PHP

$username = $_POST["username"];$password = $_POST["password"];echo json_encode($response);

You have to make a map, the map supports key-value type, and than you post with volley.In php you get $variable = $_POST["key_from_map"] to retreive it's value in the $variableThen you build up the response and json_encode it.

Here is a php example of how to query sql and post answer back as JSON

$response["devices"] = array();    while ($row = mysqli_fetch_array($result)) {        $device["id"] = $row["id"];        $device["type"] = $row["type"];        array_push($response["devices"], $device);      }    $response["success"] = true;    echo json_encode($response);

You can see here that the response type is JSONObject

public CustomRequest(int method, String url,Map<String, String> params, Listener<JSONObject> reponseListener, ErrorListener errorListener)

Look at the listener's parameter!

JSONObject params = new JSONObject();        try {            params.put("name", "Droider");        } catch (JSONException e) {            e.printStackTrace();        }JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,                url, params,                new Response.Listener<JSONObject>() {                    @Override                    public void onResponse(JSONObject response) {                        Log.d(TAG, response.toString());                        pDialog.hide();                    }                }, new Response.ErrorListener() {                    @Override                    public void onErrorResponse(VolleyError error) {                        VolleyLog.d(TAG, "Error: " + error.getMessage());                        pDialog.hide();                    }                }) {                 @Override                 public Map<String, String> getHeaders() throws AuthFailureError {                        HashMap<String, String> headers = new HashMap<String, String>();                        headers.put("Content-Type", "application/json; charset=utf-8");                        return headers;                   }         };// Adding request to request queueAppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);

and in your server side:

<?php     $value = json_decode(file_get_contents('php://input'));     $file = 'MyName.txt';     file_put_contents($file, "The received name is {$value->name} ", FILE_APPEND | LOCK_EX);    ?>

open MyName.txt and see the result.

Here is a simple code to send post request to php script

MainActivity.java

public class MainActivity extends AppCompatActivity implements View.OnClickListener {private static final String REGISTER_URL = "http://simplifiedcoding.16mb.com/UserRegistration/volleyRegister.php";public static final String KEY_USERNAME = "username";public static final String KEY_PASSWORD = "password";public static final String KEY_EMAIL = "email";private EditText editTextUsername;private EditText editTextEmail;private EditText editTextPassword;private Button buttonRegister;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    editTextUsername = (EditText) findViewById(R.id.editTextUsername);    editTextPassword = (EditText) findViewById(R.id.editTextPassword);    editTextEmail= (EditText) findViewById(R.id.editTextEmail);    buttonRegister = (Button) findViewById(R.id.buttonRegister);    buttonRegister.setOnClickListener(this);}private void registerUser(){    final String username = editTextUsername.getText().toString().trim();    final String password = editTextPassword.getText().toString().trim();    final String email = editTextEmail.getText().toString().trim();    StringRequest stringRequest = new StringRequest(Request.Method.POST, REGISTER_URL,            new Response.Listener<String>() {                @Override                public void onResponse(String response) {                    Toast.makeText(MainActivity.this,response,Toast.LENGTH_LONG).show();                }            },            new Response.ErrorListener() {                @Override                public void onErrorResponse(VolleyError error) {                    Toast.makeText(MainActivity.this,error.toString(),Toast.LENGTH_LONG).show();                }            }){        @Override        protected Map<String,String> getParams(){            Map<String,String> params = new HashMap<String, String>();            params.put(KEY_USERNAME,username);            params.put(KEY_PASSWORD,password);            params.put(KEY_EMAIL, email);            return params;        }    };    RequestQueue requestQueue = Volley.newRequestQueue(this);    requestQueue.add(stringRequest);}@Overridepublic void onClick(View v) {    if(v == buttonRegister){        registerUser();    }}}

volleyRegister.php

<?phpif($_SERVER['REQUEST_METHOD']=='POST'){    $username = $_POST['username'];    $email = $_POST['email'];    $password = $_POST['password'];    require_once('dbConnect.php');    $sql = "INSERT INTO volley (username,password,email) VALUES ('$username','$email','$password')";    if(mysqli_query($con,$sql)){        echo "Successfully Registered";    }else{        echo "Could not register";    }}else{echo 'error'}}

Source: Android Volley Post Request Tutorial