Android应用程序插入空行而不是值

Question

当我尝试从Android模拟器运行它时，我的代码插入一个空字段。

php脚本没问题，当我用实际值替换变量时，它可以工作。

当我自己运行脚本时，它会向我的数据库发送一行，该行为空白。

<?php
$connect = mysql_connect("localhost","","") or die(mysql_error());
mysql_select_db("tedd_fyp") or die(mysql_error());
$username = $_POST['username'];
$password = $_POST['password'];


$query="INSERT INTO name (username, password) VALUES ('$username' ,'$password')";

$res = mysql_query($query) or die ("Error: ". mysql_error(). " with query ");

mysql_close($connect);

echo $res;
?>

这是我的java代码，无法连接到我的php脚本。

当我运行此脚本时，没有任何反应。

      setContentView(R.layout.activity_main);

      editText1 = (EditText) findViewById(R.id.editText1);
      editText2 = (EditText) findViewById(R.id.editText2);


    Button registerLecturer=(Button)findViewById(R.id.button1);
     registerLecturer.setOnClickListener(new View.OnClickListener() {

     public void onClick(View v) {
     // TODO Auto-generated method stub

          String username = editText1.getText().toString();
          String password = editText2.getText().toString(); 

         try
         {

        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://tedd.5gbfree.com/insert.php");

          ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
             nameValuePairs.add(new BasicNameValuePair("username", username));
             nameValuePairs.add(new BasicNameValuePair("password", password));


         httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
         HttpResponse response = httpclient.execute(httppost);

         }
         catch(Exception e)
         {
         e.printStackTrace();
         }
     }
     });


    }