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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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public class DropdownMenu {
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private Button mButton;
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private PopupMenu mPopupMenu;
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private Menu mMenu;
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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);
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mPopupMenu = new PopupMenu(context, mButton);
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mMenu = mPopupMenu.getMenu();
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
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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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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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public MenuItem findItem(int id) {
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return mMenu.findItem(id);
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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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}
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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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// DropdownMenu类用于创建一个下拉菜单的功能组件，它将一个Button按钮与一个PopupMenu（弹出式菜单）相关联，
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// 点击按钮时会弹出对应的菜单，并且可以设置菜单选项的点击监听器、查找特定菜单项以及设置按钮显示的标题等操作。
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public class DropdownMenu {
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// 用于存储关联的Button按钮对象，该按钮作为触发弹出菜单显示的交互元素
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private Button mButton;
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// 用于存储创建的PopupMenu（弹出式菜单）对象，承载具体的菜单内容和交互逻辑
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private PopupMenu mPopupMenu;
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// 用于存储PopupMenu对应的Menu对象，方便后续对菜单本身进行一些操作，比如查找菜单项等
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private Menu mMenu;
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// 构造函数，用于初始化DropdownMenu实例，传入上下文、要关联的Button按钮以及菜单资源的ID
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public DropdownMenu(Context context, Button button, int menuId) {
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// 将传入的Button按钮对象赋值给成员变量mButton，以便后续操作
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mButton = button;
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// 为Button按钮设置背景资源，这里使用了资源文件中定义的drawable资源（dropdown_icon）作为按钮的背景图片，
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// 通常用于展示一个下拉箭头之类的图标，提示用户该按钮可以点击弹出菜单
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mButton.setBackgroundResource(R.drawable.dropdown_icon);
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// 创建一个PopupMenu实例，传入当前上下文和关联的Button按钮，使得弹出菜单能够在合适的位置（以按钮为锚点）显示出来
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mPopupMenu = new PopupMenu(context, mButton);
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// 获取PopupMenu对应的Menu对象，并赋值给成员变量mMenu，方便后续操作菜单内容
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mMenu = mPopupMenu.getMenu();
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// 使用MenuInflater（菜单填充器）将指定资源ID对应的菜单布局资源填充到创建的Menu对象中，
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// 这样就构建好了具体的菜单结构，包含了各个菜单项等内容
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
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// 为Button按钮设置点击事件监听器，当按钮被点击时触发相应逻辑
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mButton.setOnClickListener(new OnClickListener() {
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// 实现OnClickListener接口的点击事件处理方法，当按钮被点击时
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public void onClick(View v) {
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// 调用PopupMenu的show方法，显示弹出式菜单，使其展示在屏幕上供用户选择菜单项
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mPopupMenu.show();
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}
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});
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}
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// 用于设置PopupMenu中菜单项的点击事件监听器，外部可以传入实现了OnMenuItemClickListener接口的实例，
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// 来处理用户点击菜单项后的相应逻辑
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
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if (mPopupMenu!= null) {
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// 如果PopupMenu对象不为空，为其设置菜单项点击事件监听器，将传入的监听器对象关联到PopupMenu上
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mPopupMenu.setOnMenuItemClickListener(listener);
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}
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}
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// 用于在已构建的Menu对象中查找指定ID的菜单项，返回对应的MenuItem对象，方便外部对特定菜单项进行操作，比如获取其属性、设置其状态等
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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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// 用于设置Button按钮显示的标题文本内容，改变按钮上展示给用户的文字提示信息
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public void setTitle(CharSequence title) {
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mButton.setText(title);
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}
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}
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