Connecter une base de données Android

package com.example.info;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.onclickListener;
import android.widget.Button;
import android.widget.EditText;

public class Vile extends Activity implements onclickListener{

Button ok;
EditText code;

@Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.main);
super.onCreate(savedInstanceState);
ok=((Button)this.findViewById(R.id.ok));
ok.setonclickListener(this);
code=((EditText)this.findViewById(R.id.num));
}

@Override
public void onclick(View v) {
String n = code.getText().toString();
long x = Long.valueOf(n);
if ((x<=0)||(x>50)) code.setText("code non valide");

}

}