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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;//导入ui包
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import android.content.Context;//引入需要使用的Context、Menu等包
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import android.view.Menu;
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import android.view.MenuItem;//菜单条款
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import android.view.View;
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import android.view.View.OnClickListener;//监听点击
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import android.widget.Button;//导入按钮工具
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import android.widget.PopupMenu;//弹出菜单
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import android.widget.PopupMenu.OnMenuItemClickListener;//菜单点击监听器
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import net.micode.notes.R;
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public class DropdownMenu {//声明一个下拉菜单
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private Button mButton;//定义按钮控件
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private PopupMenu mPopupMenu;//定义弹出式菜单
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private Menu mMenu;//定义菜单
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public DropdownMenu(Context context, Button button, int menuId) {//设置显示一个菜单
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mButton = button;//设置按钮样式
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mButton.setBackgroundResource(R.drawable.dropdown_icon);//设置其背景资源为下拉菜单的图标
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mPopupMenu = new PopupMenu(context, mButton);//实例化一个弹出式菜单
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mMenu = mPopupMenu.getMenu();//获得弹出式菜单的菜单项
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);//获得弹出式菜单的菜单项
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mButton.setOnClickListener(new OnClickListener() {//当我们点击mButton时，会弹出菜单
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public void onClick(View v) {
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mPopupMenu.show();
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}//设点击显示菜单
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});
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}
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {//置下拉菜单的点击监听方法
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if (mPopupMenu != null) {
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mPopupMenu.setOnMenuItemClickListener(listener);//对非空的菜单的具体条目设置监听
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}
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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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}//根据索引搜索菜单需要的选项
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}
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