Android : HttpURLConnection in Android

I am trying to establish a connection from my android application to a database made in MySQL. For that I am first trying to establish a connection from my app to a dummy database i created in phpMyAdmin because I don't want to corrupt my live data in my database. I am using a HttpURLConnection to post the form i created, below is my code.

public class Login1 extends Activity{
private EditText  username=null;
private EditText  password=null;
//private HttpClient httpclient=null;
//private HttpPost httppost =null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.login_screen);
    //httpclient = new DefaultHttpClient();
    //httppost = new HttpPost("http://localhost/abc/index.php");
    username = (EditText)findViewById(R.id.editText1);
    password = (EditText)findViewById(R.id.editText2);
    Button submit = (Button)findViewById(R.id.button2);

    submit.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            String  uname = username.getText().toString();
            String  pwd = password.getText().toString();
            // TODO Auto-generated method stub
                tryLogin(uname, pwd);
        }
    });

}

protected void tryLogin(String myusername, String mypassword)
{           
    HttpURLConnection connection;
   OutputStreamWriter request = null;

        URL url = null;   
        String response = null;         
        String parameters = "myusername="+myusername+"&mypassword="+mypassword;   

        try
        {
            url = new URL("http://localhost/abc/index.php");
            connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            connection.setRequestMethod("POST");    

            request = new OutputStreamWriter(connection.getOutputStream());
            request.write(parameters);
            request.flush();
            request.close();            
            String line = "";               
            InputStreamReader isr = new InputStreamReader(connection.getInputStream());
            BufferedReader reader = new BufferedReader(isr);
            StringBuilder sb = new StringBuilder();
            while ((line = reader.readLine()) != null)
            {
                sb.append(line + "\n");
            }
            // Response from server after login process will be stored in response variable.                
            response = sb.toString();
            // You can perform UI operations here
            Toast.makeText(this,"Message from Server: \n"+ response, 0).show();             
            isr.close();
            reader.close();

        }
        catch(IOException e)
        {
            // Error
        }
}

}

The code for my php script is-

<?php
$host="localhost"; // Host name 
$username="root"; // Mysql username 
$password=""; // Mysql password 
$db_name="test"; // Database name 

// Connect to server and select databse.
$con = mysqli_connect("$host", "$username", "$password", "$db_name")or die("cannot connect"); 
//mysqli_select_db("$db_name")or die("cannot select DB");
?>

<?php
include("dbpath.php");

$myusername=$_POST['myusername']; 
$mypassword=$_POST['mypassword']; 

// To protect MySQL injection (more detail about MySQL injection)
//$myusername = stripslashes($myusername);
//$mypassword = stripslashes($mypassword);
//$myusername = mysql_real_escape_string($myusername);
//$mypassword = mysql_real_escape_string($mypassword);
//$sql="SELECT * FROM usertable WHERE username='$myusername' and password='$mypassword'";
$sql = "Insert into usertable (`username`,`password`) values ('$myusername', '$mypassword')";
$result = $con->query($sql);

//while($row = mysqli_fetch_array($result)) { 
// echo "Success";
//} 
echo "success";
?>

Now, when I run the debugger to check for bugs it gets stuck where i define

request = new OutputStreamWriter(connection.getOutputStream());

What is the reason for this thing?