How to use button, spinner and buttonlistener

package md.ap;

import android.app.Activity;                   
import android.os.Bundle;                      
import android.widget.*;   
import android.view.View;

public class fun_app extends Activity            
{                                                     
Spinner   spinner1;
Button    button1;           
EditText   text1; 

@Override                                                
protected void onCreate(Bundle icicle)  

{       
super.onCreate(icicle);                           
//setTheme(android.R.style.Theme_Dark);
setContentView(R.layout.main);   
spinner1 = (Spinner) findViewById  (R.id.spinner1);  
button1    = (Button) findViewById (R.id.button1);                                               
text1      = (EditText) findViewById  (R.id.text1);       
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, array_List);        
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);                   
spinner1.setAdapter(adapter);         
button1.setOnClickListener(  new clicker());    
}         

private static final String[] array_List = {"sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday" };  

class  clicker implements  Button.OnClickListener

{ 
public   void  onClick(View   v)
{        
String s = (String) spinner1.getSelectedItem(); 
text1.setText(s);                                
}                                         

}   


}