Android开发之创建ContextMenu上下文菜单

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</ListView>
</LinearLayout>

package com.example.test_contextmenu;

import java.util.ArrayList;

import android.os.Bundle;
import android.app.Activity;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showListView();
}

public void showListView(){
//初始化控件
ListView listView = (ListView) findViewById(R.id.listView);
//初始化适配器
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, getData());
//为ListView配置适配器
listView.setAdapter(adapter);
//注册上下文菜单
this.registerForContextMenu(listView);
}

/**
* 构造listView显示的数据
*/
private ArrayList<String> getData() {
// TODO Auto-generated method stub
ArrayList<String> list=new ArrayList<String>();
for(int i=0;i<5;i++){
list.add("文件"+(i+1));
}
return list ;
}

/**
* 设置上下文菜单
*/
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
super.onCreateContextMenu(menu, v, menuInfo);
//设置Menu显示内容
menu.setHeaderTitle("文件操作");
menu.setHeaderIcon(R.drawable.ic_launcher);
//动态增加Menu菜单项   add(groupId,itemId,order,title)-->(分组id,菜单id,菜单项排序,菜单名)
menu.add(1, 1, 1, "复制");
menu.add(1, 2, 1, "粘贴");
menu.add(1, 3, 1, "剪切");
menu.add(1, 4, 1, "重命名");
}

/**
*设置上下文菜单监听事件
*/
@Override
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case 1:
Toast.makeText(MainActivity.this,"你点击了复制",1000).show();
break;
case 2:
Toast.makeText(MainActivity.this,"你点击了粘贴",1000).show();
break;
case 3:
Toast.makeText(MainActivity.this,"你点击了剪切",1000).show();
break;
case 4:
Toast.makeText(MainActivity.this,"你点击了重命名",1000).show();
break;

default:
break;
}
return super.onContextItemSelected(item);
}
}