spinners

package com.example.spinners;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import  android.view.View;
import  android.widget.AdapterView;
import  android.widget.AdapterView.OnItemSelectedListener;
import  android.widget.ArrayAdapter;
import  android.widget.Spinner;
import  android.widget.Toast;



public class MainActivity extends Activity {
	
	String[] presidents;	 
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main1);
        
        presidents = 
            getResources().getStringArray(R.array.presidents_array);
        Spinner s1 = (Spinner) findViewById(R.id.spinner1);
        
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_dropdown_item, presidents);
 
        s1.setAdapter(adapter);
        s1.setOnItemSelectedListener(new OnItemSelectedListener()
        {
        	@Override
            public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) 
            {
                int index = arg0.getSelectedItemPosition();
                Toast.makeText(getBaseContext(), 
                    "You have selected item : " + presidents[index], 
                    Toast.LENGTH_SHORT).show();                
            }

			@Override
			public void onNothingSelected(AdapterView<?> arg0) {} 
        });        
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    
   <Spinner 
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:drawSelectorOnTop = "true"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Spinners</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    
    <string-array name = "presidents_array">
        <item>Dwight D. Eisenhower</item>
        <item>John F. Kenneday</item>
        <item >Lyndon B. Johnson</item>
        <item>Richard Nixon</item>
        <item >Gerald Ford</item>
        <item >Jimmy Carter</item>
        <item >Ronald Reagan</item>
        <item >George H.W.Bush</item>
        <item >Bill Clinton</item>
        <item >George W.Bush</item>
        <item >Barack Obama</item>
    </string-array>

</resources>