Android_Menu_contextMenu

xml文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.menudemo.ContextMenuDemo" >

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

</RelativeLayout>

源代码：

package com.example.menudemo;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
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;
/**
 * ContextMenu的组成
 *         标题以及标题图标
 *         菜单内容
 *         菜单内容的点击响应事件
 *
 * ContextMenu与OptionMenu的区别：
 *         OptionMenu对应的是activity，一个activity只能拥有一个选项菜单
 *          ContextMenu对应的是View，每个View都可以设置上下文菜单
 *          一般情况下ContextMenu常用于ListView或者GridView
 *     ContextMenu创建方法
 *        首先给View注册上下文菜单registerForContextMenu()
 *        添加上下文菜单内容onCreateContextMenu()
 *            -通过代码动态添加
 *            -加载xml文件中的菜单项
 *        设置菜单点击后响应事件onContextItemSelected()
 * @author Administrator
 *
 */
public class ContextMenuDemo extends Activity {

    private ListView listview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.context_menu);
        showListView();
        this.registerForContextMenu(listview);//给ListView注册上下文菜单
    }
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        // TODO Auto-generated method stub
        super.onCreateContextMenu(menu, v, menuInfo);
        //设置Menu显示的内容
        menu.setHeaderIcon(R.drawable.ic_launcher);
        menu.setHeaderTitle("file oprate");
        menu.add(1, 1, 1, "copy");
        menu.add(1, 2, 1, "cut");
        menu.add(1, 3, 1, "delete");
        menu.add(1, 4, 1, "rename");
        /**加载xml文件中的菜单项
         * getMenuInflater().inflate(R.menu.main,menu);
         */

    }
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
    switch(item.getItemId()){
        case 1:
            Toast.makeText(this, "copy", Toast.LENGTH_SHORT).show();
            break;
        case 2:
            Toast.makeText(this, "cut", Toast.LENGTH_SHORT).show();
            break;
        case 3:
            Toast.makeText(this, "delete", Toast.LENGTH_SHORT).show();
            break;
        case 4:
            Toast.makeText(this, "rename", Toast.LENGTH_SHORT).show();
            break;
    }

    return super.onContextItemSelected(item);

    }
    /**
     * 设置ListView显示的内容
     */
    private void showListView(){
        listview = (ListView) findViewById(R.id.listView);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,getData());
        listview.setAdapter(adapter);
    }
    /**
     * 构造ListView显示的数据
     * @return
     */
    private List<String> getData() {
        // TODO Auto-generated method stub
        List<String> list = new ArrayList<String>();
        for(int i = 0;i<5;i++){
            list.add("file"+(i+1));
        }
        return list;
    }

}