/* * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.micode.notes.ui; import android.content.Context; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.PopupMenu; import android.widget.PopupMenu.OnMenuItemClickListener; import net.micode.notes.R; /* 功能:实现一个下拉菜单的功能 */ public class DropdownMenu { private Button mButton;//定义了一个按钮对象 private PopupMenu mPopupMenu;//定义弹出菜单 private Menu mMenu;//菜单对象 public DropdownMenu(Context context, Button button, int menuId) { mButton = button; mButton.setBackgroundResource(R.drawable.dropdown_icon);//设置按钮的样式 mPopupMenu = new PopupMenu(context, mButton); mMenu = mPopupMenu.getMenu(); mPopupMenu.getMenuInflater().inflate(menuId, mMenu); mButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { mPopupMenu.show(); } }); } public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) { if (mPopupMenu != null) { mPopupMenu.setOnMenuItemClickListener(listener); } } public MenuItem findItem(int id) {//方法接受一个id参数,表示要查找的菜单项的ID。 return mMenu.findItem(id); } public void setTitle(CharSequence title) {//设置按钮的标题 mButton.setText(title); } }