Android中ContextMenu用法实例

<?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"
 >
<listview
 android:id="@android:id/list"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"></listview>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:orientation="vertical">
 <textview
  android:id="@+id/label"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:textsize="30sp"></textview>
</linearlayout>

package com.yyl;
import android.app.listactivity;
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;
public class menudemoactivity extends listactivity {
 public static final int eight_id = menu.first+1;
 public static final int sixteen_id = menu.first+2;
 public static final int twenty_four_id = menu.first+3;
 public static final int two_id = menu.first+4;
 public static final int thirty_two_id = menu.first+5;
 public static final int forty_id = menu.first+6;
 public static final int one_id = menu.first+7;
 string[] items={"lorem", "ipsum", "dolor", "sit", "amet",
   "consectetuer", "adipiscing", "elit", "morbi", "vel",
   "ligula", "vitae", "arcu", "aliquet", "mollis",
   "etiam", "vel", "erat", "placerat", "ante",
   "porttitor", "sodales", "pellentesque", "augue", "purus"};
 @override
 public void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.main);
  setlistadapter(new arrayadapter(this,r.layout.simple_list_item_1,r.id.label,items));
  //注册contextview到view中
  registerforcontextmenu(getlistview());
 }
 //重写该方法，生成contextmenu菜单
 @override
 public void oncreatecontextmenu(contextmenu menu, view v,
   contextmenuinfo menuinfo) {
  this.populatemenu(menu);
  super.oncreatecontextmenu(menu, v, menuinfo);
 }
 private void populatemenu(menu menu) {
  menu.add(menu.none, one_id, menu.none, "1 pixel");
  menu.add(menu.none, two_id, menu.none, "2 pixels");
  menu.add(menu.none, eight_id, menu.none, "8 pixels");
  menu.add(menu.none, sixteen_id, menu.none, "16 pixels");
  menu.add(menu.none, twenty_four_id, menu.none, "24 pixels");
  menu.add(menu.none, thirty_two_id, menu.none, "32 pixels");
  menu.add(menu.none, forty_id, menu.none, "40 pixels");
 }
}