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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; //声明一个按钮
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private PopupMenu mPopupMenu; //声明一个下拉菜单
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private Menu mMenu;//声明菜单
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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);//设置背景
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mPopupMenu = new PopupMenu(context, mButton);
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mMenu = mPopupMenu.getMenu();//返回与此弹出窗口相关的菜单。在调用show()之前，用项填充返回的Menu。返回:与此弹出窗口关联的菜单
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);//返回:一个MenuInflater，可用于将菜单项从XML扩展到getMenu()返回的菜单中。
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mButton.setOnClickListener(new OnClickListener() {//注册一个回调，以便在单击此视图时调用。如果这个视图是不可点击的，它就变成了可点击的。
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public void onClick(View v) {
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mPopupMenu.show();
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}//当视图被单击时调用
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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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}//设置菜单的监听
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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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}//对于菜单选项的初始化
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public void setTitle(CharSequence title) {
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mButton.setText(title);
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}//布局文件并设置标题
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}
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