メニューリソースを用いたオプションメニュー

<?xml version="1.0" encoding="utf-8"?>
<menu 
  xmlns:android="http://schemas.android.com/apk/res/android">
	<item 
		android:id="@+id/menuitem1"
		android:title="Item1"
		android:icon="@drawable/a"/>
	<item
		android:id="@+id/menuitem2"
		android:title="Item2"
		android:icon="@drawable/b"/>
	<item
		android:id="@+id/menuitem3"
		android:title="Item3"
		android:icon="@drawable/c"/>
</menu>

package com.keicode.android.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

public class OptMenu1Activity extends Activity {
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);
		MenuInflater inflater = getMenuInflater();
		inflater.inflate(R.menu.optionsmenu, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch(item.getItemId()){
		case R.id.menuitem1:
			showMessage("Hello! Item1");
			return true;
		case R.id.menuitem2:
			showMessage("Hello! Item2");
			return true;
		case R.id.menuitem3:
			showMessage("Hello! Item3");
			return true;
		}
		return false;
	}
	
	protected void showMessage(String msg){
		Toast.makeText(
			this, 
			msg, Toast.LENGTH_SHORT).show();
	}
}