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63 lines
2.4 KiB
63 lines
2.4 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;
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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 {//声明一个下拉菜单类
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private Button mButton;/*按钮控件、下拉菜单按键、菜单*/
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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) {//首先是公有类DropdownMenu的私有数据成员申明,其中包括了对象按钮mButton,
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// 菜单对象mMenu和弹出菜单控件对象mPopupMenu
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mButton = button; //设置下拉菜单的背景
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mButton.setBackgroundResource(R.drawable.dropdown_icon); //
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mPopupMenu = new PopupMenu(context, mButton);//初始化下拉菜单由mButton触发
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mMenu = mPopupMenu.getMenu();//将menuId指向的菜单项目添加到mMenu中
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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) {//方法：对非空的菜单的具体条目设置监听。
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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) {//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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return mMenu.findItem(id);
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}
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public void setTitle(CharSequence title) {//根据索引搜索菜单需要的选项
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mButton.setText(title);
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}
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}
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