Не могу подключить мой андроид к моему php серверу

Я новичок в разработке Android, и я работал над этим проектом, чтобы создать функцию входа в систему. Но, похоже, у меня проблемы с получением информации с моего сервера. Не могу заставить мой код работать.

Login.java

package com.httpkhronolog.khronolog;

import android.app.ActionBar;
import android.app.Notification;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;
import android.util.Log;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;

public class Login_Activity extends AppCompatActivity {

public static final String SERVER_ADDRESS = "http://www.khronolog.com/mobile/";
public static final String TAG_LOGINSTATUS = "loginStatus";
EditText etUsername, etPassword;
ImageButton ibLogin;
Context context;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
context = this;

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});

etUsername = (EditText) findViewById(R.id.etUsername);
etPassword = (EditText) findViewById(R.id.etPassword);
ibLogin = (ImageButton)findViewById(R.id.ibLogin);

ibLogin.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
String username = etUsername.getText().toString();
String password = etPassword.getText().toString();

if(username.length() == 0 || password.length() == 0){
Toast toast = Toast.makeText(context, "Username or password not entered", Toast.LENGTH_SHORT);
toast.show();
return;
}else
{
new checkUserDetails().execute(username, password);
}
}
});

}

public class checkUserDetails extends AsyncTask<String, Boolean, Boolean>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
}

@Override
protected Boolean doInBackground(String... params) {


DataOutputStream printout;
HttpURLConnection urlConn;
BufferedReader reader;
URL url;
String json;
JSONObject jObj;
Boolean JSONLogin = false;

//send POST login details to server
try {
url = new URL(SERVER_ADDRESS + "login.php");
urlConn = (HttpURLConnection) url.openConnection();
urlConn.setRequestMethod("POST");
urlConn.setDoOutput(true);
urlConn.setRequestProperty("Accept-Charset", "UTF-8");
urlConn.setReadTimeout(10000);
urlConn.setConnectTimeout(15000);

HashMap<String, String> map = new HashMap<String, String>();
map.put("username", params[0]);
map.put("password", params[1]);

StringBuilder sb = new StringBuilder();
for(HashMap.Entry<String, String> e : map.entrySet()){
if(sb.length() > 0){
sb.append("&");
}
sb.append(URLEncoder.encode(e.getKey(), "UTF-8")).append("=").append(URLEncoder.encode(e.getValue(), "UTF-8"));
}


String loginDetails = sb.toString();

printout = new DataOutputStream(urlConn.getOutputStream());
printout.writeBytes(loginDetails);
printout.flush();
printout.close();

reader = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));
StringBuilder sb2 = new StringBuilder();
String result = null;
while((result=reader.readLine())!=null) {
sb2.append(result + '\n');
Log.d("Results", sb2.toString());
};

json = result.toString();

jObj = new JSONObject(json);


JSONLogin = jObj.getBoolean(TAG_LOGINSTATUS);
Log.d("LoginStatus!!!!", JSONLogin.toString());

} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
Log.d("JsonConvertion", "FAILED TO CONVERT JSON");
}


return JSONLogin;
}

@Override
protected void onPostExecute(Boolean aBoolean) {
super.onPostExecute(aBoolean);
}
}




/*
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_login_, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}
*/
}

login.php на сервере

<?php
if (isset($_POST['username'])) {
// Define $username and $password
$username=$_POST['username'];
$password=$_POST['password'];
// Establishing Connection with Server by passing server_name, user_id and password as a parameter
$connection = mysql_connect("localhost", "SomeAdmin", "somepassword");
// To protect MySQL injection for Security purpose
$username = stripslashes($username);
$password = stripslashes($password);
$username = mysql_real_escape_string($username);
$password = mysql_real_escape_string($password);
// Selecting Database
$db = mysql_select_db("khronolo_systemdb", $connection);
// SQL query to fetch information of registerd users and finds user match.
$query = mysql_query("select * from user_table where password='$password' AND email='$username'", $connection);
$rows = mysql_num_rows($query);
if ($rows == 1) {
$returnValue[] = array("loginStatus"=> "true");
echo json_encode($returnValue);
}
else {
$returnValue[] = array("loginStatus"=> "false");
echo json_encode($returnValue);
}
mysql_close($connection); // Closing Connection
}
}

?>

ошибка трассировки стека

    10-18 18:12:05.310 2594-2711/? E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime: Process: com.httpkhronolog.khronolog, PID: 2594
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime: java.lang.RuntimeException: An error occurred while executing doInBackground()
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at android.os.AsyncTask$3.done(AsyncTask.java:309)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:  Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.lookupHostByName(InetAddress.java:464)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.getAllByName(InetAddress.java:215)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:188)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:157)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:100)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:357)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:340)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:245)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.httpkhronolog.khronolog.Login_Activity$checkUserDetails.doInBackground(Login_Activity.java:125)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.httpkhronolog.khronolog.Login_Activity$checkUserDetails.doInBackground(Login_Activity.java:82)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:  Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at libcore.io.Posix.android_getaddrinfo(Native Method)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.lookupHostByName(InetAddress.java:451)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.getAllByName(InetAddress.java:215)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:188)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:157)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:100)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:357)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:340)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:245)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.httpkhronolog.khronolog.Login_Activity$checkUserDetails.doInBackground(Login_Activity.java:125)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.httpkhronolog.khronolog.Login_Activity$checkUserDetails.doInBackground(Login_Activity.java:82)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:  Caused by: android.system.ErrnoException: android_getaddrinfo failed: EACCES (Permission denied)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at libcore.io.Posix.android_getaddrinfo(Native Method)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.lookupHostByName(InetAddress.java:451)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.net.InetAddress.getAllByName(InetAddress.java:215)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:188)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:157)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:100)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:357)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:340)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:245)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.httpkhronolog.khronolog.Login_Activity$checkUserDetails.doInBackground(Login_Activity.java:125)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at com.httpkhronolog.khronolog.Login_Activity$checkUserDetails.doInBackground(Login_Activity.java:82)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
10-18 18:12:05.310 2594-2711/? E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:818)
10-18 18:12:05.328 1296-1846/? W/ActivityManager:   Force finishing activity com.httpkhronolog.khronolog/.Login_Activity

Я знаю, что моя проблема в aynctask, но я не уверен, как ее решить :(. Пожалуйста, помогите