Android之用PopupWindow實現(xiàn)彈出菜單的方法詳解

2020-04-11 12:09:51

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在使用UC-WebBrowser時，你會發(fā)現(xiàn)它的彈出菜單跟系統(tǒng)自帶的菜單不一樣。它實現(xiàn)更多菜單選項的顯示和分欄。其實，它的本身是PopupWindow或者是AlertDialog對話框，在里面添加兩個GridView控件，一個是菜單標題欄，一個是菜單選項。菜單選項視圖的切換可以通過適配器的變換，輕松地實現(xiàn)。
點擊下載該實例：
一、運行截圖：

二、實現(xiàn)要點：
（1）屏蔽系統(tǒng)彈出的菜單：
1、首先創(chuàng)建至少一個系統(tǒng)的菜單選項

復制代碼代碼如下:

@Override
 public boolean onCreateOptionsMenu(Menu menu) {

  menu.add("menu");
  return super.onCreateOptionsMenu(menu);
 }

2、在onMenuOpened方法里顯示自己的菜單視圖，并返回FALSE。

復制代碼代碼如下:

@Override
 public boolean onMenuOpened(int featureId, Menu menu) {
  myMenu.showAtLocation(findViewById(R.id.layout), Gravity.BOTTOM, 0,0);

  return false; // true--顯示系統(tǒng)自帶菜單；false--不顯示。
 }

（2）點擊菜單欄，切換菜單視圖時，只要重新設置當前的適配器對象就可以。

復制代碼代碼如下:

gv_body.setAdapter(bodyAdapter[arg2]); //改變選項視圖

（3）繼承PopupWindow，重寫一個類實現(xiàn)彈出對話框，主要是為了更好更簡便實現(xiàn)彈出菜單的樣式和事件響應等等。

復制代碼代碼如下:

public class MyDefinedMenu extends PopupWindow { 。。。}

三、具體代碼如下：
（1）布局：

復制代碼代碼如下:

<?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）程序代碼
1、主類：MyMenu

復制代碼代碼如下:

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; //標題欄
 private List<List<String>> item_names; //選項名稱
 private List<List<Integer>> item_images; //選項圖標
 private MyDefinedMenu myMenu; //彈出菜單

 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //彈出菜單標題欄
        titles = addItems(new String[]{"菜單一", "菜單二", "菜單三"});
        //選項圖標
        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}));
        //選項名稱
        item_names = new ArrayList<List<String>>();
        item_names.add(addItems(new String[]{"購物", "藍牙", "游覽器", "郵件"}));
        item_names.add(addItems(new String[]{"地圖", "新聞", "閱讀器", "音箱", "錄音"}));
        item_names.add(addItems(new String[]{"電話", "藍牙", "閱讀器", "郵箱"}));
        //創(chuàng)建彈出菜單對象
  myMenu = new MyDefinedMenu(this, titles, item_names, 
    item_images, new ItemClickEvent());

    }

    /**
     * 轉(zhuǎn)換為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;
    }

    /**
     * 轉(zhuǎn)換為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--顯示系統(tǒng)自帶菜單；false--不顯示。
 }

 /**
  * 菜單選項點擊事件
  * @author Kobi
  *
  */
 class ItemClickEvent implements OnItemClickListener {
  @Override
  public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
    long arg3) {
   //顯示點擊的是哪個菜單哪個選項。
   Toast.makeText(MyMenu.this, "Menu: " + 
     titles.get(myMenu.getTitleIndex()) + 
     " Item: " + item_names.get(myMenu.getTitleIndex()).get(arg2),
     Toast.LENGTH_SHORT).show();
   myMenu.dismiss(); //菜單消失
  }

 }  
}

2、彈出菜單類：MyDefinedMenu、

復制代碼代碼如下:

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; //總的布局
 private GridView gv_title;  //菜單欄
 private GridView gv_body;  //選項視圖
 private BodyAdatper[] bodyAdapter; //選項適配器
 private TitleAdatper titleAdapter; //標題適配器
 private Context context;   //上下文
 private int titleIndex;    //菜單序號

 

 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));

  //菜單欄
     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()); //菜單個數(shù)
  gv_title.setBackgroundColor(Color.WHITE);

  //選項視圖
  bodyAdapter = new BodyAdatper[item_names.size()]; //各個視圖適配器
  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); //每行顯示4個選項
  gv_body.setBackgroundColor(Color.TRANSPARENT);
  gv_body.setAdapter(bodyAdapter[0]); //設置適配器

  //菜單項切換
  gv_title.setOnItemClickListener(new OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
    titleIndex = arg2; //記錄當前選中菜單項序號
    titleAdapter.setFocus(arg2);
    gv_body.setAdapter(bodyAdapter[arg2]); //改變選項視圖
   }
  });

  //設置選項點擊事件
  gv_body.setOnItemClickListener(itemClickEvent);

  //添加標題欄和選項
  layout.addView(gv_title);
  layout.addView(gv_body);

  // 添加菜單視圖
  this.setContentView(layout);
  this.setWidth(LayoutParams.FILL_PARENT);
  this.setHeight(LayoutParams.WRAP_CONTENT);
  this.setFocusable(true);// menu菜單獲得焦點 如果沒有獲得焦點menu菜單中的控件事件無法響應  

 }

 /**
  * 獲取當前選中菜單項
  * @return 菜單項序號
  */
 public int getTitleIndex() {

  return titleIndex;
 }

}

3、菜單欄適配器：TitleAdatper

復制代碼代碼如下:

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;
 }

 /**
  * 選中后，改變菜單顏色。
  * @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) {
  //菜單欄文字項
  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、菜單項視圖適配器：BodyAdatper

復制代碼代碼如下:

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) {
  //總布局
  LinearLayout layout = new LinearLayout(context);
  layout.setOrientation(LinearLayout.VERTICAL);
  layout.setGravity(Gravity.CENTER);
  //選項名稱
  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));
  //選項圖表
  ImageView img_item = new ImageView(context);
  img_item.setLayoutParams(new LayoutParams(50, 50));
  img_item.setImageResource(item_images.get(position));
  //添加選項圖標和名字
  layout.addView(img_item);
  layout.addView(tv_item);

  return layout;
 }
}