上下文菜单非常类似于Windows操作系统中的右键菜单，在Android操作系统中，用户可以通过长按打开上下文菜单。
在MyMenuDemo.java程序中
package com.li.menu;
import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MyMenuDemo extends Activity {
private String data[] = new String[]{
"河池学院","http://blog.sina.com.cn/u/2853310902",
"数学系：李叶文","中国高校","helloliyewen@163.com"}; //定义ListView的显示项
private ListView listView = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.listView = new ListView(this);
this.listView.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_expandable_list_item_1,
this.data));
super.setContentView(this.listView);
super.registerForContextMenu(this.listView);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()){
case Menu.FIRST + 1:
Toast.makeText(this,"您选择的是“添加联系人”项",Toast.LENGTH_LONG).show();
break;
case Menu.FIRST + 2:
Toast.makeText(this,"您选择的是“查看详情”项",Toast.LENGTH_LONG).show();
break;
case Menu.FIRST + 3:
Toast.makeText(this,"您选择的是“删除信息”项",Toast.LENGTH_LONG).show();
break;
case Menu.FIRST + 4:
Toast.makeText(this,"您选择的是“另存为”项",Toast.LENGTH_LONG).show();
break;
case Menu.FIRST + 5:
Toast.makeText(this,"您选择的是“编辑”项",Toast.LENGTH_LONG).show();
break;
}
return false;
}
@Override
public void onContextMenuClosed(Menu menu) {
Toast.makeText(this,"上下文菜单关闭了",Toast.LENGTH_LONG).show();
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
menu.setHeaderTitle("信息操作");
menu.add(Menu.NONE,Menu.FIRST + 1,1,"添加联系人");
menu.add(Menu.NONE,Menu.FIRST + 2,2,"查看详情");
menu.add(Menu.NONE,Menu.FIRST + 3,3,"删除信息");
menu.add(Menu.NONE,Menu.FIRST + 4,4,"另存为");
menu.add(Menu.NONE,Menu.FIRST + 5,5,"编辑");
}
}