Android开发之Menu：OptionMenu(选项菜单)、ContextMenu(上下文菜单)、SubMenu(子菜单)

  这个地方的“default”，我觉得比较好。

package cn.fansunion.menu;


import cn.fansunion.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.widget.Toast;


/**
 * ①：直接去覆盖public boolean onCreateOptionsMenu(Menu menu) { code......}，
 * 这个方法，需要注意的是，这个方法如果覆盖的了，只会被创建一次，也就是说， 选项菜单只会去被实例化一次，之后就不会被去调用了
 * ②：调用Menu中的add（）方法，来添加每一个菜单选项, add(groupId, itemId, order, titleRes) group:
 * 选项组号，一般都设置成0就OK啦 itenId: 选项的Id 很重要 order:顺序，一般来说都设置0就行了 titelRes: 选项的标题名字
 * ③：当我们去点击某项的选项的时候，覆盖重写onOptionsItemSelected(MenuItem item)这个方法去实现点击事件.
 */
public class OptionMenuActivity extends Activity {
	// 点击菜单选项的常量Id
	private static final int MENU_ONE = 1;
	private static final int MENU_TWO = 2;
	private static final int MENU_THREE = 3;
	private int MENU_SUB = 11;
	private static final  int GROUP_ZERO = 0;
	
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.option_menu);


	}


	/**
	 * @param group
	 *            : 选项组号，一般都设置成0就OK啦
	 * @param itenId
	 *            : 选项的Id 很重要
	 * @param order
	 *            :顺序，一般来说都设置0就行了
	 * @param titelRes
	 *            : 选项的标题名字
	 */
	public boolean onCreateOptionsMenu(Menu menu) {	
		menu.add(GROUP_ZERO, MENU_ONE, GROUP_ZERO, "小雷");
		// 一个menu可以包括多个子菜单
		SubMenu subMenu=menu.addSubMenu(GROUP_ZERO, MENU_SUB, GROUP_ZERO, "小雷兴趣");
		subMenu.add(GROUP_ZERO, MENU_TWO, GROUP_ZERO, "互联网技术");
		subMenu.add(GROUP_ZERO, MENU_THREE, GROUP_ZERO, "投资理财");
		return true;


	}


	/**
	 * 
	 * @param item
	 *            .getItemId() 获取被点击的Id
	 */
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case MENU_ONE:
			Toast.makeText(this, "你点击了Menu1", Toast.LENGTH_LONG).show();
			break;
		case MENU_TWO:
			Toast.makeText(this, "你点击了Menu2", Toast.LENGTH_LONG).show();
			break;
		case MENU_THREE:
			Toast.makeText(this, "你点击了Menu3", Toast.LENGTH_LONG).show();
			break;
		
		default:
			return super.onOptionsItemSelected(item);
		}
		return true;
	}
}

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
    <TextView    
       android:layout_width="fill_parent"   
       android:layout_height="wrap_content"   
       android:text="FansUnion,Android Demo "/>  
   
</LinearLayout>  

package cn.fansunion.menu;
import cn.fansunion.R;
import android.app.Activity;  
import android.os.Bundle;  
import android.view.ContextMenu;  
import android.view.ContextMenu.ContextMenuInfo;  
import android.view.MenuItem;  
import android.view.View;  
import android.widget.TextView;  
import android.widget.Toast;  
  
public class ContextMenuActivity extends Activity {  
    private static final int GROUP = 0;
	private static final int MENU_ONE = 1;  
    private static final int MENU_TWO = 2;  
    private static final int MENU_THREE = 3;  
  
    private TextView contextView;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.context_menu);  
        contextView = (TextView) this.findViewById(R.id.contextMenu);  
        registerForContextMenu(contextView);  
    }  
  
    @Override  
    public void onCreateContextMenu(ContextMenu menu, View v,  
            ContextMenuInfo menuInfo) {  
        super.onCreateContextMenu(menu, v, menuInfo);  
        menu.add(GROUP, MENU_ONE, 0, "小雷FansUnion");  
        menu.add(GROUP, MENU_TWO, 0, "互联网技术");  
        menu.add(GROUP, MENU_THREE, 0, "投资理财");  
    }  
  
    @Override  
    public boolean onContextItemSelected(MenuItem item) {  
        switch (item.getItemId()) {  
        case MENU_ONE:  
            Toast.makeText(this, "你 点击的是Menu1", Toast.LENGTH_LONG).show();  
            contextView.setText("你点击的是Menu1");  
            break;  
  
        case MENU_TWO:  
            Toast.makeText(this, "你点击的是Menu2", Toast.LENGTH_LONG).show();  
            contextView.setText("你点击的是Menu2");  
            break;  
        case MENU_THREE:  
            Toast.makeText(this, "你点击的是Menu3", Toast.LENGTH_LONG).show();  
            contextView.setText("你点击的是Menu3");  
            break;  
        }  
        return true;  
    }  
}  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	 <TextView    
	   android:id="@+id/contextMenu"  
       android:layout_width="fill_parent"   
       android:layout_height="wrap_content"   
       android:text="FansUnion,ContextMenuDemo "/>  
</LinearLayout>	

Android开发之Menu：OptionMenu(选项菜单)、ContextMenu(上下文菜单)、SubMenu(子菜单)

原文：http://blog.csdn.net/fansunion/article/details/49943691