Buongiorno a tutti io dovrei connettere e mandare dai dati ad una pagina php da un'activity

//--------------------------------------------------------------------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
androidaddingBottom="@dimen/activity_vertical_margin"
androidaddingLeft="@dimen/activity_horizontal_margin"
androidaddingRight="@dimen/activity_horizontal_margin"
androidaddingTop="@dimen/activity_vertical_margin"
tools:context="aa.slider_2.MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="EMAIL"
android:layout_marginTop="55dp"
android:id="@+id/textEmail"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />

<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:ems="10"
android:id="@+id/email_box"
android:layout_below="@+id/textEmail"
android:layout_centerHorizontal="true" />


<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="PASSWORD"
android:layout_marginTop="150dp"
android:id="@+id/textpsw"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />

<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:ems="10"
android:layout_below="@+id/textpsw"
android:layout_alignLeft="@+id/email_box"
android:layout_alignStart="@+id/email_box"
android:id="@+id/psw_box" />

<Button
android:text="ACCEDI"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_accedi"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />

</RelativeLayout>
//-------------------------------------------------------------------------------------------------------------


JAVA

package aa.slider_2;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;
import java.net.HttpURLConnection;
import java.net.URL;
import android.widget.Button;
import android.widget.EditText;
import android.content.Intent;
import android.app.Activity;
import java.io.IOException;
import java.io.*;
import java.net.URLEncoder;


//ricorda che quando implementi onclicklistener devi richiamare obbligatoriamente il metodo unclick()
public class MainActivity extends Activity implements OnClickListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//------------------------------------------------------------------------------------------
 //metto listener il bottone
final Button btn_accedi = (Button) findViewById(R.id.btn_accedi);
btn_accedi.setOnClickListener(this);
}

public void onClick(View v) {
// TODO Auto-generated method stub
switch ( v.getId() ) {
case R.id.btn_accedi:
final EditText email = (EditText) findViewById(R.id.email_box);
final EditText password = (EditText) findViewById(R.id.psw_box);
//-------------------------------------------------------------------------------------
try {
// recuperare il testo inserito dall'utente
String post_email_1 = email.getText().toString();
String post_psw_1 = password.getText().toString();


// codifico le coppie di dati da inviare
String post_email_2 = URLEncoder.encode("post_email", "UTF-8") + "=" + URLEncoder.encode(post_email_1, "UTF-8");
String post_psw_2 = URLEncoder.encode("post_password", "UTF-8") + "=" + URLEncoder.encode(post_psw_1, "UTF-8");

//SCELGO DOVE URL E INZIO LA CONNESIONE
URL paginaURL = new URL("https://www.malebee.cloud/webservice/log-in/log.php");
HttpURLConnection client = (HttpURLConnection) paginaURL.openConnection();

// se devo inviare il dato in POST
client.setDoOutput(true);
client.setChunkedStreamingMode(0);

// scrivo nello stream di uscita
OutputStreamWriter wr = new OutputStreamWriter(client.getOutputStream());
wr.write(post_email_2 + post_psw_2);
wr.flush();
wr.close();


}catch (Exception e){}
break;
}
}
}

//-----------------------------------------------------------------------------------
PAGINA PHP

<?php
//file di log
//controllo richieste accessi ( se sono troppe qualcosa non va)
$mail = ""; $p="";
require_once("log-in-class.php");
if ( isset( $_POST["post_email"] )
{
$mail = $_POST["post_email"];
if( isset( $_POST["post_password"] )
{
$p = $_POST["post_password"];
}
}
$Access = new LogIn_DBoperations ( $mail, $p );
$Access->checkAccess();
$Access->replyWithXML();
?>