Cómo validar las credenciales de inicio de sesión de usuario en android con PHP, MySql con la ayuda de json

He hecho este código para mi proyecto. Y funciona bien. Darle una oportunidad.

Login2.php

<?php $un=$_POST['username']; $pw=$_POST['password']; //connect to the db $host="localhost"; // Host name $user="root"; // Mysql username $pswd=""; // Mysql password $db="database_name"; // Database name $tbl_name="user_info"; // Table name $conn = mysql_connect($host, $user, $pswd); mysql_select_db($db, $conn); //run the query to search for the username and password the match //$query = "SELECT * FROM $tbl_name WHERE first_name = '$un' AND password = '$pw'"; $query = "SELECT emp_id FROM $tbl_name WHERE first_name = '$un' AND password = '$pw'"; $result = mysql_query($query) or die("Unable to verify user because : " . mysql_error()); //this is where the actual verification happens if(mysql_num_rows($result) > 0) echo mysql_result($result,0); // for correct login response else echo 0; // for incorrect login response ?> 

Código Java para Android login.java

Tomar dos edittext y botón y en el botón haga clic en poner este código. Elimine el método saveperference si no desea guardar el nombre de usuario, emp_id a la aplicación completa.

  @Override public void onClick(View v) { // TODO Auto-generated method stub ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>(); postParameters.add(new BasicNameValuePair("username", username .getText().toString())); postParameters.add(new BasicNameValuePair("password", password .getText().toString())); // String valid = "1"; String response = null; try { // "http://10.0.2.2//Mobile/login2.php" response = CustomHttpClient .executeHttpPost( "http://10.0.2.2//Mobile/login2.php", postParameters); // now in result you will have the response from php file either 0 or 1. result = response.toString(); // res = res.trim(); result = result.replaceAll("\\s+", ""); // error.setText(res); if (!result.equals("0")) { SavePreferences("name", "pass", "emp_id", username .getText().toString(), password.getText() .toString()); Intent in = new Intent(Login.this, MainScreen.class); // LoadPreferences(); error.setText(""); startActivity(in); } else error.setText("Incorrect Username or Password"); } catch (Exception e) { // un.setText(e.toString()); } } 

CustumHttpClient.java

 public class CustomHttpClient { /** The time it takes for our client to timeout */ public static final int HTTP_TIMEOUT = 30 * 1000; // milliseconds /** Single instance of our HttpClient */ private static HttpClient mHttpClient; /** * Get our single instance of our HttpClient object. * * @return an HttpClient object with connection parameters set */ private static HttpClient getHttpClient() { if (mHttpClient == null) { mHttpClient = new DefaultHttpClient(); final HttpParams params = mHttpClient.getParams(); HttpConnectionParams.setConnectionTimeout(params, HTTP_TIMEOUT); HttpConnectionParams.setSoTimeout(params, HTTP_TIMEOUT); ConnManagerParams.setTimeout(params, HTTP_TIMEOUT); } return mHttpClient; } /** * Performs an HTTP Post request to the specified url with the * specified parameters. * * @param url The web address to post the request to * @param postParameters The parameters to send via the request * @return The result of the request * @throws Exception */ public static String executeHttpPost(String url, ArrayList<NameValuePair> postParameters) throws Exception { BufferedReader in = null; try { HttpClient client = getHttpClient(); HttpPost request = new HttpPost(url); UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters); request.setEntity(formEntity); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String result = sb.toString(); return result; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * Performs an HTTP GET request to the specified url. * * @param url The web address to post the request to * @return The result of the request * @throws Exception */ public static String executeHttpGet(String url) throws Exception { BufferedReader in = null; try { HttpClient client = getHttpClient(); HttpGet request = new HttpGet(); request.setURI(new URI(url)); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String result = sb.toString(); return result; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } } 

Su cliente androide debe hacer una publicación HTTP en su script PHP, que devuelve el código de estado. Su script ve esa solicitud como cualquier otra solicitud. El cliente recibe el resultado del servidor y realiza el cálculo que necesita.

Sólo tienes que seguir este código creo que su trabajo bien …

 $email = isset($_REQUEST['email'])?urldecode($_REQUEST['email']):""; $passwd= isset($_REQUEST['passwd'])?urldecode($_REQUEST['passwd']):""; if($email==""||$passwd=="" ) { $return_data['status'] = 0; } else { $user_info="select id from table name WHERE email=$emailAND passwd=$passwd"; if($user_info) { $return_data['status'] = 1; } else { $return_data['status'] = 0; } } echo json_encode($return_data);