I wrote a login page with android studio. My first database was MySQL and the app worked right. But I tried to use PostgreSQL database and change the php code to postgres database to
> $conn = new PDO("pgsql:dbname=$dbname;host=$servername", $username,
> $password);
and i did not change any java code. and now I can't connect to the database and unfortunately I do not receive any report and error from app. But I can reach the database through browser.
Java Login Class:
package org.schools.loginregister;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class LoginActivity extends AppCompatActivity {
public static final int CONNECTION_TIMEOUT=10000;
public static final int READ_TIMEOUT = 15000;
private EditText benutzername;
private EditText passwort;
private Button einloggenBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
benutzername = (EditText) findViewById(R.id.benutzername);
passwort = (EditText) findViewById(R.id.passwort);
einloggenBtn = (Button) findViewById(R.id.einloggenbtn);
einloggenBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final String ibenutzername = benutzername.getText().toString();
final String ipasswort = passwort.getText().toString();
new AsyncLogin().execute(ibenutzername,ipasswort);
}
});
}
private class AsyncLogin extends AsyncTask<String,String,String>{
ProgressDialog pdLoading = new ProgressDialog(LoginActivity.this);
HttpURLConnection conn;
URL url = null;
@Override
protected void onPreExecute(){
super.onPreExecute();
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected String doInBackground(String... params) {
try {
// Enter URL address where your php file resides
url = new URL("http://192.168.241.1//android_user_api//login.inc.php");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "exception";
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection)url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");
// setDoInput and setDoOutput method depict handling of both send and receive
conn.setDoInput(true);
conn.setDoOutput(true);
// Append parameters to URL
Uri.Builder builder = new Uri.Builder()
.appendQueryParameter("benutzername", params[0])
.appendQueryParameter("passwort", params[1]);
String query = builder.build().getEncodedQuery();
// Open connection for sending data
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return "exception";
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return(result.toString());
}else{
return("unsuccessful");
}
} catch (IOException e) {
e.printStackTrace();
return "exception";
} finally {
conn.disconnect();
}
}
@Override
protected void onPostExecute(String result) {
//this method will be running on UI thread
pdLoading.dismiss();
if(result.equalsIgnoreCase("true"))
{
/* Here launching another activity when login successful. If you persist login state
use sharedPreferences of Android. and logout button to clear sharedPreferences.
*/
Intent intent = new Intent(LoginActivity.this,StartActivity.class);
startActivity(intent);
LoginActivity.this.finish();
}else if (result.equalsIgnoreCase("false")){
// If username and password does not match display a error message
Toast.makeText(LoginActivity.this, "Invalid email or password", Toast.LENGTH_LONG).show();
} else if (result.equalsIgnoreCase("exception") || result.equalsIgnoreCase("unsuccessful")) {
Toast.makeText(LoginActivity.this, "OOPs! Something went wrong. Connection Problem.", Toast.LENGTH_LONG).show();
}
}
}
}
The PHP code for Postgresql:
<?php
$servername = "127.0.0.1";
$username = "postgres";
$password = "12345678";
$dbname = "postgres";
try {
$conn = new PDO("pgsql:dbname=$dbname;host=$servername", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e)
{
die("OOPs something went wrong");
}
?>
second php file:
<?php
include 'config.inc.php';
// Check whether username or password is set from android
if(isset($_POST['benutzername']) && isset($_POST['passwort']))
{
// Innitialize Variable
$result='';
$benutzername = $_POST['benutzername'];
$passwort = $_POST['passwort'];
// Query database for row exist or not
$sql = 'SELECT * FROM user WHERE benutzername = :benutzername AND passwort = :passwort;';
$stmt = $conn->prepare($sql);
$stmt->bindParam(':benutzername', $benutzername, PDO::PARAM_STR);
$stmt->bindParam(':passwort', $passwort, PDO::PARAM_STR);
$stmt->execute();
if($stmt->rowCount())
{
$result="true";
}
elseif(!$stmt->rowCount())
{
$result="false";
}
// send result back to android
echo $result;
}
?>
