/**

      * Initialize the contents of the Activity's standard options menu.

      * You should place your menu items in to menu.

      */

     public boolean onCreateOptionsMenu(Menu menu) {

         super.onCreateOptionsMenu(menu);

         //经代码测试：只有按手机上的菜单键的时候才执行onCreateOptionsMenu()

         System.out.println("===onCreateOptionsMenu()方法====");

         menu.add(0, MENU_ITEM_INSERT, 0, R.string.menu_insert);

         menu.add(0, android.view.Menu.NONE, 1, R.string.menu_insert_2);

         return true;

     }

 /**

      * This is called right before the menu is shown, every time it is shown

      */

     public boolean onPrepareOptionsMenu(Menu menu) {

         super.onPrepareOptionsMenu(menu);

         //在onCreateOptionsMenu(Menu menu)方法之后执行，

         System.out.println("public boolean onPrepareOptionsMenu(Menu menu)");

         myToast("public boolean onPrepareOptionsMenu(Menu menu) ");

         /*

          * getListAdapter()：Get the ListAdapter associated with this activity's

          * ListView. getCount():How many items are in the data set represented

          * by this Adapter.

          */

         final boolean haveItems = getListAdapter().getCount() > 0;

         myToast("getListAdapter().getCount()一共有" + getListAdapter().getCount()

                 + "个");

         if (haveItems) {

             // getListView():Get the activity's list view widget.

             if (getListView().getSelectedItemId() > 0) {

                 menu.removeGroup(1);

                 Uri uri = ContentUris.withAppendedId(getIntent().getData(),

                         getListView().getSelectedItemId());

                 Intent intent = new Intent(null, uri);

                 // TODO 下面这行代码还不知道到底怎么用

                 menu.add(1, MENU_ITEM_EDIT, 1, "编辑内容").setIntent(intent);

                 menu.add(1, MENU_ITEM_DELETE, 1, "删除当前日记");

             }

         } else {

             menu.removeGroup(1);

         }

         return true;

     }