Android中Menu的几个类型学习

Android provides three types of application menus:
1.Options Menu(presses the device MENU key)
  最多可以显示6个按钮,不支持复选或单选按钮
  如果需要有多余6个需要显示,可是用Expanded Menu进行显示

2.Context Menu
  当用户长按下某个View的时候,比如:EditText

3.Submenu
  A submenu item cannot support a nested submenu


给个简单例子:
1. MenuTest.java

package v.m;

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

public class MenuTest extends Activity
{
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}

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

	public boolean onOptionsItemSelected(MenuItem item)
	{
		// Handle item selection
		switch (item.getItemId())
		{
		case R.id.new_game:
			newGame();
			// it returns "true" to indicate that the item selection was handled
			return true;
		case R.id.quit:
			quit();
			return true;
		default:
			return super.onOptionsItemSelected(item);
		}
	}

	public void newGame()
	{
		System.out.println("new Game!!!");
	}

	public void quit()
	{
		finish();
	}
	
}

2.game_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
	<item android:id="@+id/new_game" android:icon="@drawable/icon"
		android:title="New Game" />
	<item android:id="@+id/quit" android:icon="@drawable/icon"
		android:title="Quit" />
</menu>