ContextMenu是一种悬浮于主界面上的菜单。当注册到一个View对象上时，默认情况下可以长按View对象约2秒钟呼出上下文菜单。

Context menus do not support item shortcuts and item icons：不支持快捷键和显示图标。

To show a context menu on long click, most clients will want to call  and override .

实现步骤：

1、定义一个View对象，并给它注册上下文菜单 ：registerForContextMenu(View)

2、重写回调函数： onCreateContextMenu(...)

3、响应点击事件： onContextItemSelected(MenuItem item)

 

main.xml

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

<LinearLayout xmlns:android=""

 

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical"

>

  <TextView

    android:id="@+id/myTextView"

    android:textSize="20sp"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:text="hello"

    />

   

</LinearLayout>

下面是 .java

 

package com.example.menucontext;

 

import android.app.Activity;

import android.os.Bundle;

import android.view.ContextMenu;

import android.view.Menu;

import android.view.MenuItem;

import android.view.ContextMenu.ContextMenuInfo;

import android.view.View;

 

import android.widget.TextView;

import android.util.Log;

public class ContextMenuActivity extends Activity {

   

    private static final int C_MENU_NEW = 0;

    private static final int C_MENU_OPEN =1;

 

    MenuItem contextmenu_item_new=null;

    MenuItem contextmenu_item_open=null;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);  

        TextView tv=new TextView(this);

        tv.setText("上下文菜单的载体");

        //将上文定义的TextView注册上下文菜单

        registerForContextMenu(tv);

        setContentView(tv);

      

    }

    

   

    

    //上下文菜单，本例会通过长按条目激活上下文菜单

    @Override

    public void onCreateContextMenu(ContextMenu menu, View view,

            ContextMenuInfo menuInfo) {

        menu.setHeaderTitle("welsh");

        //添加菜单项

       contextmenu_item_new=menu.add(0, C_MENU_NEW, 0, "新建");

        contextmenu_item_open=menu.add(0,C_MENU_OPEN, 0, "打开");

       

    }

    

    //菜单单击响应

    @Override

    public boolean onContextItemSelected(MenuItem item){

        //获取当前被选择的菜单项的信息 

        switch(item.getItemId()){

        case C_MENU_NEW:

            //在这里添加处理代码

            

            break;

        case C_MENU_OPEN:

            //在这里添加处理代码

            

            break;   

     

        }

        return true;

    }

   

}

 

 结果图：