Cara mengakses aplikasi ppob melalui Android

PpobClient.java

import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.client.CookieStore;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.client.method.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.NameValuePair;
import org.apache.http.HttpResponse;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;

import java.util.ArrayList;


public class PpobClient {

    private static final URL_LOGIN = "http://aplikasi/j_spring_security_check";
    private static final URL_INQUIRY = "http://aplikasi/transaksi/inquiry";
    private static final URL_PAYMENT = "http://aplikasi/transaksi/payment";    
    
    private CookieStore cookieStore = new BasicCookieStore();
    private HttpContext httpContext = new BasicHttpContext();
    private DefaultHttpClient client = new DefaultHttpClient();
    
    public PpobClient(){
        // inisialisasi penyimpanan cookie
        httpContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);
    }
    
    public void login(String username, String password){
        HttpPost loginRequest = new HttpPost(URL_LOGIN);
        ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("j_username", username));
        postParameters.add(new BasicNameValuePair("j_password", password));
        
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters);
        loginRequest.setEntity(formEntity);
        
        HttpResponse hasil = client.execute(loginRequest, httpContext);
        
        // cek hasilnya
        // kalau dapat login page lagi, berarti login gagal
        // kalau dapat halaman menu utama, berarti sukses
    }
    
    public void inquiry(String pelanggan){
        HttpPost inquiryRequest = new HttpPost(URL_INQUIRY);
        ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("idpel", pelanggan));
        HttpResponse hasil = client.execute(inquiryRequest, httpContext);
        
        // proses hasilnya
    }
    
    public void payment(String refnum){
        HttpPost paymentRequest = new HttpPost(URL_INQUIRY);
        ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("reference", refnum));
        HttpResponse hasil = client.execute(paymentRequest, httpContext);
        
        // proses hasilnya
    }
}