Coding di Eclipse

package com.example.phplogin;

import java.util.ArrayList;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

    RadioButton admin, operator;
    Button loginBtn;
    EditText user, pass;
    TextView textview;
    private String url ="http://10.0.2.2/login_android/login.php";



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        admin = (RadioButton) findViewById(R.id.rb_admin);
        operator = (RadioButton) findViewById(R.id.rb_operator);
        user = (EditText) findViewById(R.id.userInput);
        pass = (EditText) findViewById(R.id.passInput);
        loginBtn = (Button)findViewById(R.id.button1);
        loginBtn.setOnClickListener(this);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


    @Override
    public void onClick(View arg0) {
        kirimData();
    }

    private void kirimData(){

        ArrayList <NameValuePair> kirimkephp = new ArrayList<NameValuePair>();
        kirimkephp.add(new BasicNameValuePair("auser", user.getText().toString()));
        kirimkephp.add(new BasicNameValuePair("apass", pass.getText().toString()));
        kirimkephp.add(new BasicNameValuePair("admin", admin.getContext().toString()));
        kirimkephp.add(new BasicNameValuePair("operator", operator.getContext().toString()));
        String respon = null;
        try{
            respon = ClientToServer.eksekusiHttpPost(url, kirimkephp);
            String res = respon.toString();
            res = res.trim();
            Toast.makeText(this, res.toString(), Toast.LENGTH_SHORT).show();


        }catch (Exception e){

            e.printStackTrace();
        }
    }

}