Android中ContextMenu用法实例

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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");
 }
}