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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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/**
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* 下拉菜单工具类，用于在小米便签中实现按钮触发的弹出式菜单
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* 典型场景：笔记列表的批量操作菜单、编辑页的功能选项菜单等
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*/
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public class DropdownMenu {
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// 触发下拉菜单的按钮
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private Button mButton;
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// 系统提供的弹出式菜单组件，负责显示下拉选项
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private PopupMenu mPopupMenu;
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// 菜单容器，存储从资源文件加载的菜单项
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private Menu mMenu;
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/**
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* 构造方法：初始化下拉菜单
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* @param context 上下文对象，用于访问资源和创建视图
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* @param button 触发下拉菜单的按钮
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* @param menuId 菜单资源ID（定义在res/menu目录下）
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*/
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public DropdownMenu(Context context, Button button, int menuId) {
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mButton = button;
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// 设置按钮背景为下拉图标（箭头图标）
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mButton.setBackgroundResource(R.drawable.dropdown_icon);
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// 初始化PopupMenu，绑定到触发按钮
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mPopupMenu = new PopupMenu(context, mButton);
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// 获取菜单容器
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mMenu = mPopupMenu.getMenu();
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// 从资源文件加载菜单项到菜单容器
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
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// 设置按钮点击事件：点击时显示下拉菜单
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mButton.setOnClickListener(new OnClickListener() {
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public void onClick(View v) {
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mPopupMenu.show();
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}
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});
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}
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/**
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* 设置下拉菜单项的点击事件监听器
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* @param listener 监听器对象，处理菜单项点击逻辑
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*/
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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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}
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}
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/**
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* 根据ID查找菜单中的具体选项
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* @param id 菜单项的资源ID
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* @return 对应的MenuItem对象，可用于修改状态（如勾选、隐藏）
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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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}
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/**
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* 设置触发按钮的显示文本
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* @param title 要显示的文本（如"已选择3项"）
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*/
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public void setTitle(CharSequence title) {
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mButton.setText(title);
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}
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} |
