【转载】Android之用PopupWindow实现弹出菜单
在使用UC-WebBrowser时，你会发现它的弹出菜单跟系统自带的菜单不一样。它实现更多菜单选项的显示和分栏。其实，它的本身是PopupWindow或者是AlertDialog对话框，在里面添加两个GridView控件，一个是菜单标题栏，一个是菜单选项。菜单选项视图的切换可以通过适配器的变换，轻松地实现。该实例下载路径：http://download.csdn.net/source/3275759
一、运行截图：
二、实现要点：
（1）屏蔽系统弹出的菜单：
1、首先创建至少一个系统的菜单选项
@Override public boolean onCreateOptionsMenu(Menu menu) { menu.add("menu"); return super.onCreateOptionsMenu(menu); }
2、在onMenuOpened方法里显示自己的菜单视图，并返回FALSE。
@Override public boolean onMenuOpened(int featureId, Menu menu) { myMenu.showAtLocation(findViewById(R.id.layout), Gravity.BOTTOM, 0,0); return false; // true--显示系统自带菜单；false--不显示。 }
（2）点击菜单栏，切换菜单视图时，只要重新设置当前的适配器对象就可以。
public class MyDefinedMenu extends PopupWindow { 。。。}
（3）继承PopupWindow，重写一个类实现弹出对话框，主要是为了更好更简便实现弹出菜单的样式和事件响应等等。
三、 具体代码如下：
（1）布局：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/layout" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout>
（2）程序代码
1、主类：MyMenu
package com.myandroid.test; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.Gravity; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.Toast; public class MyMenu extends Activity { private List<String> titles; //标题栏 private List<List<String>> item_names; //选项名称 private List<List<Integer>> item_images; //选项图标 private MyDefinedMenu myMenu; //弹出菜单 /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //弹出菜单标题栏 titles = addItems(new String[]{"菜单一", "菜单二", "菜单三"}); //选项图标 item_images = new ArrayList<List<Integer>>(); item_images.add(addItems(new Integer[]{R.drawable.bag, R.drawable.bluetooth, R.drawable.earth, R.drawable.email})); item_images.add(addItems(new Integer[]{R.drawable.map, R.drawable.news, R.drawable.reader, R.drawable.sound, R.drawable.tape})); item_images.add( addItems(new Integer[]{R.drawable.telephone, R.drawable.bluetooth, R.drawable.earth, R.drawable.email})); //选项名称 item_names = new ArrayList<List<String>>(); item_names.add(addItems(new String[]{"购物", "蓝牙", "游览器", "邮件"})); item_names.add(addItems(new String[]{"地图", "新闻", "阅读器", "音箱", "录音"})); item_names.add(addItems(new String[]{"电话", "蓝牙", "阅读器", "邮箱"})); //创建弹出菜单对象 myMenu = new MyDefinedMenu(this, titles, item_names, item_images, new ItemClickEvent()); } /** * 转换为List<String> * @param values * @return */ private List<String> addItems(String[] values) { List<String> list = new ArrayList<String>(); for (String var : values) { list.add(var); } return list; } /** * 转换为List<Integer> * @param values * @return */ private List<Integer> addItems(Integer[] values) { List<Integer> list = new ArrayList<Integer>(); for (Integer var : values) { list.add(var); } return list; } @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add("menu"); return super.onCreateOptionsMenu(menu); } @Override public boolean onMenuOpened(int featureId, Menu menu) { myMenu.showAtLocation(findViewById(R.id.layout), Gravity.BOTTOM, 0,0); return false; // true--显示系统自带菜单；false--不显示。 } /** * 菜单选项点击事件 * @author Kobi * */ class ItemClickEvent implements OnItemClickListener { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { //显示点击的是哪个菜单哪个选项。 Toast.makeText(MyMenu.this, "Menu: " + titles.get(myMenu.getTitleIndex()) + " Item: " + item_names.get(myMenu.getTitleIndex()).get(arg2), Toast.LENGTH_SHORT).show(); myMenu.dismiss(); //菜单消失 } } }
2、弹出菜单类：MyDefinedMenu
package com.myandroid.test; import java.util.List; import com.myandroid.test.MyMenu.ItemClickEvent; import android.content.Context; import android.graphics.Color; import android.util.Log; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.GridView; import android.widget.LinearLayout; import android.widget.PopupWindow; public class MyDefinedMenu extends PopupWindow { private LinearLayout layout; //总的布局 private GridView gv_title; //菜单栏 private GridView gv_body; //选项视图 private BodyAdatper[] bodyAdapter; //选项适配器 private TitleAdatper titleAdapter; //标题适配器 private Context context; //上下文 private int titleIndex; //菜单序号 public MyDefinedMenu(Context context, List<String> titles, List<List<String>> item_names, List<List<Integer>> item_images, ItemClickEvent itemClickEvent) { super(context); this.context = context; //布局框架 layout = new LinearLayout(context); layout.setOrientation(LinearLayout.VERTICAL); layout.setLayoutParams(new LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT)); //菜单栏 titleIndex = 0; gv_title = new GridView(context); titleAdapter = new TitleAdatper(context, titles); gv_title.setAdapter(titleAdapter); gv_title.setLayoutParams(new LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT)); gv_title.setNumColumns(titles.size()); //菜单个数 gv_title.setBackgroundColor(Color.WHITE); //选项视图 bodyAdapter = new BodyAdatper[item_names.size()]; //各个视图适配器 for (int i = 0; i < item_names.size(); i++) { bodyAdapter[i] = new BodyAdatper(context, item_names.get(i), item_images.get(i)); } gv_body = new GridView(context); gv_body.setNumColumns(4); //每行显示4个选项 gv_body.setBackgroundColor(Color.TRANSPARENT); gv_body.setAdapter(bodyAdapter[0]); //设置适配器 //菜单项切换 gv_title.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { titleIndex = arg2; //记录当前选中菜单项序号 titleAdapter.setFocus(arg2); gv_body.setAdapter(bodyAdapter[arg2]); //改变选项视图 } }); //设置选项点击事件 gv_body.setOnItemClickListener(itemClickEvent); //添加标题栏和选项 layout.addView(gv_title); layout.addView(gv_body); // 添加菜单视图 this.setContentView(layout); this.setWidth(LayoutParams.FILL_PARENT); this.setHeight(LayoutParams.WRAP_CONTENT); this.setFocusable(true);// menu菜单获得焦点 如果没有获得焦点menu菜单中的控件事件无法响应 } /** * 获取当前选中菜单项 * @return 菜单项序号 */ public int getTitleIndex() { return titleIndex; } }
3、菜单栏适配器：TitleAdatper
package com.myandroid.test; import java.util.List; import android.content.Context; import android.graphics.Color; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.TextView; public class TitleAdatper extends BaseAdapter { private List<String> titles; private Context context; private final TextView[] tv_titels; public TitleAdatper(Context context, List<String> titles) { this.context = context; this.titles = titles; tv_titels = new TextView[titles.size()]; } @Override public int getCount() { // TODO Auto-generated method stub return titles.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } /** * 选中后，改变菜单颜色。 * @param position */ public void setFocus(int position) { for (int i = 0; i < titles.size(); i++) { tv_titels[i].setBackgroundColor(Color.WHITE); } tv_titels[position].setBackgroundColor(Color.BLUE); } @Override public View getView(int position, View convertView, ViewGroup parent) { //菜单栏文字项 tv_titels[position] = new TextView(context); tv_titels[position].setGravity(Gravity.CENTER); tv_titels[position].setText(titles.get(position)); tv_titels[position].setTextSize(18); tv_titels[position].setLayoutParams(new GridView.LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT)); return tv_titels[position]; } }
4、菜单项视图适配器：BodyAdatper
package com.myandroid.test; import java.util.List; import android.content.Context; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; public class BodyAdatper extends BaseAdapter { private List<String> item_names; private List<Integer> item_images; private Context context; public BodyAdatper(Context context, List<String> item_names, List<Integer> item_images) { this.context = context; this.item_names = item_names; this.item_images = item_images; } @Override public int getCount() { // TODO Auto-generated method stub return item_images.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { //总布局 LinearLayout layout = new LinearLayout(context); layout.setOrientation(LinearLayout.VERTICAL); layout.setGravity(Gravity.CENTER); //选项名称 TextView tv_item = new TextView(context); tv_item.setGravity(Gravity.CENTER); tv_item.setLayoutParams(new GridView.LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT)); tv_item.setText(item_names.get(position)); //选项图表 ImageView img_item = new ImageView(context); img_item.setLayoutParams(new LayoutParams(50, 50)); img_item.setImageResource(item_images.get(position)); //添加选项图标和名字 layout.addView(img_item); layout.addView(tv_item); return layout; } }
这里是用PopupWindow实现，当然也可以用AlertDialog或者其他自定义对话框等等，也可以改写Menu，还可以用Tab实现。实现的方法很多，但原理是相同的，例如用两个GridView，一个作为菜单栏，一个作为菜单项视图。
