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65 lines
2.8 KiB
65 lines
2.8 KiB
/*
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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; // 定义包名
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import android.content.Context; // 导入上下文类
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import android.view.Menu; // 导入菜单类
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import android.view.MenuItem; // 导入菜单项类
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import android.view.View; // 导入视图类
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import android.view.View.OnClickListener; // 导入点击监听器接口
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import android.widget.Button; // 导入按钮类
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import android.widget.PopupMenu; // 导入弹出菜单类
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import android.widget.PopupMenu.OnMenuItemClickListener; // 导入弹出菜单项点击监听器接口
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import net.micode.notes.R; // 导入资源类
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public class DropdownMenu { // 定义下拉菜单类
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private Button mButton; // 存储按钮对象
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private PopupMenu mPopupMenu; // 存储弹出菜单对象
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private Menu mMenu; // 存储菜单对象
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// 构造函数，接受上下文、按钮和菜单资源 ID
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public DropdownMenu(Context context, Button button, int menuId) {
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mButton = button; // 初始化按钮
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mButton.setBackgroundResource(R.drawable.dropdown_icon); // 设置按钮背景为下拉图标
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mPopupMenu = new PopupMenu(context, mButton); // 创建弹出菜单，依附于指定按钮
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mMenu = mPopupMenu.getMenu(); // 获取弹出菜单的菜单对象
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu); // 将指定的菜单资源填充到菜单对象中
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mButton.setOnClickListener(new OnClickListener() { // 设置按钮点击监听器
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public void onClick(View v) {
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mPopupMenu.show(); // 显示弹出菜单
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}
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});
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}
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// 设置下拉菜单项点击监听器
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
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if (mPopupMenu != null) { // 如果弹出菜单不为空
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mPopupMenu.setOnMenuItemClickListener(listener); // 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); // 根据 ID 返回菜单项
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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); // 更新按钮文本为给定的标题
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}
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} |