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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.ui;
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import android.content.Context;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.widget.Button;
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import android.widget.PopupMenu;
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import android.widget.PopupMenu.OnMenuItemClickListener;
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import net.micode.notes.R;
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//引入类，和用到的工具
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public class DropdownMenu {
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private Button mButton;//设置一个按钮
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private PopupMenu mPopupMenu;//声明下拉菜单
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private Menu mMenu;//菜单定义
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public DropdownMenu(Context context, Button button, int menuId) {
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mButton = button;
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mButton.setBackgroundResource(R.drawable.dropdown_icon);//实例按钮设置view的背景
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mPopupMenu = new PopupMenu(context, mButton);//弹出式菜单实例化实现
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mMenu = mPopupMenu.getMenu();
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//getMenuInflater：用以实例化menu目录下的menu布局文件并根据ID确定menu内容
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);//弹出式菜单视图
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mButton.setOnClickListener(new OnClickListener() {
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//设置监听
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public void onClick(View v) {
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mPopupMenu.show();
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}//下拉菜单，显示
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});
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}
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//首先是公有类DropdownMenu的私有数据成员申明,其中包括了对象按钮mButton,菜单对象mMenu和弹出菜单控件对象mPopupMenu
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
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if (mPopupMenu != null) {
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mPopupMenu.setOnMenuItemClickListener(listener);
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}//对菜单监听的设置
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}
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public MenuItem findItem(int id) {
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return mMenu.findItem(id);
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}//对于菜单选项的初始化，根据索引搜索菜单需要的选项
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public void setTitle(CharSequence title) {
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mButton.setText(title);
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}//设置标题
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}
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