【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。