How to access a remote php file from ANDROID?

For working on the localhost use 10.0.2.2 and for remote use the IP or domain name of the server.
The following code does this.

package com.pack;

import java.io.IOException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;

public class active extends Activity
{
    HttpPost httpPost;
    ResponseHandler response;
    String result;
    HttpClient htClient;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Toast.makeText(active.this,"Accessing.....", Toast.LENGTH_SHORT).show();

        htClient = new DefaultHttpClient();
        httpPost = new HttpPost("http://10.0.2.2/DB_TEST/android_test.php");
 response = new BasicResponseHandler();
 try
 {
 result = htClient.execute(httpPost,response);
 Toast.makeText(active.this,result, Toast.LENGTH_SHORT).show();
 }
 catch (ClientProtocolException e) {

 Toast.makeText(active.this,e.getMessage(), Toast.LENGTH_SHORT).show();
 }
 catch (IOException e) {
 Toast.makeText(active.this,"IO Error " + e.getMessage(), Toast.LENGTH_LONG).show();
 }
    }
}