Android — отправьте запрос с помощью Volley и получите в переполнение стека

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 queue
AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);

и на вашей стороне сервера:

<?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);
?>

открыть MyName.txt и увидим результат.

Вот простой код для отправки пост-запроса в php скрипт

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;

@Override
protected 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);
}

@Override
public void onClick(View v) {
if(v == buttonRegister){
registerUser();
}
}
}

volleyRegister.php

<?php

if($_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'}
}

Источник: Android Volley Post Учебник по запросу

всегда используйте StringRequest с залпом, так как это более безопасный способ получить ответ от сервера, если JSON поврежден или неправильно отформатирован.

Код Android:

StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {JSONObject jsonObject = new JSONObject(response);
} catch (JSONException ignored) {
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
if (volleyError instanceof TimeoutError) {
}
}
}) {
@Override
public Map<String, String> getParams() throws AuthFailureError {
HashMap<String, String> params = new HashMap<>();
params.put("name", "Droider");
return params;
}

@Override
public Priority getPriority() {
return Priority.IMMEDIATE;
}
};
ApplicationController.getInstance().addToRequestQueue(stringRequest);

PHP-код:

<?php
$name = $_POST["name"];
$j = array('name' =>$name);
echo json_encode($j);
?>

Это хорошо работает для меня, если это помогает кому-либо

public class LoginActivity extends AppCompatActivity {

private EditText Email;
private EditText Password;
private String URL = "http://REPLACE ME WITH YOUR URL/login.php";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);

TextView register = (TextView) findViewById(R.id.Register);
TextView forgotten = (TextView) findViewById(R.id.Forgotten);
Button login = (Button) findViewById(R.id.Login);
Email = (EditText) findViewById(R.id.Email);
Password = (EditText) findViewById(R.id.Password);
Password.setImeOptions(EditorInfo.IME_ACTION_DONE);

login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
RequestQueue MyRequestQueue = Volley.newRequestQueue  (LoginActivity.this);
MyRequestQueue.add(MyStringRequest);
}
});
}

StringRequest MyStringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {

@Override
public void onResponse(String response) {
Toast.makeText(getApplicationContext(),response.trim(), Toast.LENGTH_SHORT).show();
}

}, new Response.ErrorListener() { //Create an error listener to handle errors appropriately.
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(),error.toString().trim(), Toast.LENGTH_LONG).show();
}
}) {
protected Map<String, String> getParams() {
final String email = Email.getText().toString().trim();
final String password = Password.getText().toString().trim();

Map<String, String> MyData = new HashMap<String, String>();
MyData.put("email", email);
MyData.put("password", password);
return MyData;
}
};
}

Логин.php

<?php
$message = $_POST["email"];
echo $message;
?>