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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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// 定义一个名为DropdownMenu的公开类
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public class DropdownMenu {
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// 声明一个Button类型的私有成员变量mButton，用于存储下拉按钮
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private Button mButton;
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// 声明一个PopupMenu类型的私有成员变量mPopupMenu，用于存储弹出的菜单
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private PopupMenu mPopupMenu;
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// 声明一个Menu类型的私有成员变量mMenu，用于存储菜单项
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private Menu mMenu;
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// 构造方法，初始化DropdownMenu对象
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public DropdownMenu(Context context, Button button, int menuId) {
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mButton = button; // 将传入的Button对象赋值给mButton
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mButton.setBackgroundResource(R.drawable.dropdown_icon); // 设置按钮的背景资源为dropdown_icon
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mPopupMenu = new PopupMenu(context, mButton); // 创建一个新的PopupMenu对象，并将其与mButton绑定
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mMenu = mPopupMenu.getMenu(); // 获取PopupMenu中的Menu对象
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu); // 使用menuId指定的XML布局文件来填充Menu对象
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mButton.setOnClickListener(new OnClickListener() { // 为mButton设置点击监听器
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public void onClick(View v) {
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mPopupMenu.show(); // 当按钮被点击时，显示PopupMenu
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}
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});
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}
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// 设置PopupMenu的菜单项点击监听器
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
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if (mPopupMenu != null) {
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mPopupMenu.setOnMenuItemClickListener(listener); // 为PopupMenu设置菜单项点击监听器
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}
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}
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// 根据ID查找菜单项
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public MenuItem findItem(int id) {
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return mMenu.findItem(id); // 在Menu对象中查找具有指定ID的菜单项，并返回它
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}
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// 设置按钮的标题
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public void setTitle(CharSequence title) {
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mButton.setText(title); // 将传入的CharSequence对象设置为按钮的标题
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}
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}
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