Android提高21篇之十八：自定義Menu（TabMenu）

       用過UCWEB-Android版的人都應該對其特殊的menu有印象，把menu做成Tab-Menu(支持分頁的Menu)，可以容納比Android傳統的menu更豐富的內容(Android的menu超過6項則縮略在[更多]裡)，本文參考網上的例子(作者：CoffeeCole,email:[email protected])，對例子進行簡化以及封裝，使其作為一個復合控件融入自己的framework。

       先來看看本文程序運行的效果：

       TabMenu本身就是一個PopupWindow，PopupWindow上面放了兩個GridView,第一個GridView就是分頁標簽，位於PopupWindow的頂部，第二個GridView是菜單，位於PopupWindow的主體。為了實現PopupWindow的彈出/退出的動畫效果，本文使用了以下代碼：

       在工程的res文件夾裡添加anim子目錄，再新建文件popup_enter.xml：

1. <?xml version="1.0" encoding="utf-8"?>  
2. <set xmlns:android="http://schemas.android.com/apk/res/android">  
3.         <translate android:fromYDelta="100%p" android:toYDelta="0" android:duration="1000" />  
4.         <alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="1000" />  
5. </set>   

       新建文件popup_exit.xml：

1. <?xml version="1.0" encoding="utf-8"?>  
2. <set xmlns:android="http://schemas.android.com/apk/res/android">  
3.         <translate android:fromYDelta="0" android:toYDelta="100%p" android:duration="1000" />  
4.         <alpha android:fromAlpha="1.0" android:toAlpha="0.0" android:duration="1000" />  
5. </set>   

       在工程的values文件夾裡新建文件popup_animation.xml：

1. <?xml version="1.0" encoding="utf-8"?>    
2. <resources>       
3.     <style name="PopupAnimation" parent="android:Animation">  
4.         <item name="android:windowEnterAnimation">@anim/popup_enter</item>    
5.         <item name="android:windowExitAnimation">@anim/popup_exit</item>     
6.     </style>    
7. </resources>   

       main.xml的源碼如下：

1. <linearlayout android:id="@+id/LinearLayout01"   
2.         android:layout_width="fill_parent" android:layout_height="fill_parent"  
3.         xmlns:android="http://schemas.android.com/apk/res/android">  
4.         <textview android:id="@+id/TextView01" android:layout_height="wrap_content"   
5.                 android:layout_width="fill_parent" android:text="擴展Menu----hellogv">  

        TabMenu的封裝類TabMenu.java的源碼如下：

1. package com.testTabMenu;  
2. import android.content.Context;  
3. import android.graphics.Color;  
4. import android.graphics.drawable.ColorDrawable;  
5. import android.view.Gravity;  
6. import android.view.View;  
7. import android.view.ViewGroup;  
8. import android.widget.BaseAdapter;  
9. import android.widget.GridView;  
10. import android.widget.ImageView;  
11. import android.widget.LinearLayout;  
12. import android.widget.PopupWindow;  
13. import android.widget.TextView;  
14. import android.widget.AdapterView.OnItemClickListener;  
15. import android.widget.LinearLayout.LayoutParams;  
16. public class TabMenu extends PopupWindow{  
17.         private GridView gvBody, gvTitle;  
18.         private LinearLayout mLayout;  
19.         private MenuTitleAdapter titleAdapter;  
20.         public TabMenu(Context context,OnItemClickListener titleClick,OnItemClickListener bodyClick,  
21.                         MenuTitleAdapter titleAdapter,int colorBgTabMenu,int aniTabMenu){  
22.                 super(context);  
23.                   
24.                 mLayout = new LinearLayout(context);  
25.                 mLayout.setOrientation(LinearLayout.VERTICAL);  
26.                 //標題選項欄  
27.                 gvTitle = new GridView(context);  
28.                 gvTitle.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));  
29.                 gvTitle.setNumColumns(titleAdapter.getCount());  
30.                 gvTitle.setStretchMode(GridView.STRETCH_COLUMN_WIDTH);  
31.                 gvTitle.setVerticalSpacing(1);  
32.                 gvTitle.setHorizontalSpacing(1);  
33.                 gvTitle.setGravity(Gravity.CENTER);  
34.                 gvTitle.setOnItemClickListener(titleClick);  
35.                 gvTitle.setAdapter(titleAdapter);  
36.                 gvTitle.setSelector(new ColorDrawable(Color.TRANSPARENT));//選中的時候為透明色  
37.                 this.titleAdapter=titleAdapter;  
38.                 //子選項欄  
39.                 gvBody = new GridView(context);  
40.                 gvBody.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));  
41.                 gvBody.setSelector(new ColorDrawable(Color.TRANSPARENT));//選中的時候為透明色  
42.                 gvBody.setNumColumns(4);  
43.                 gvBody.setStretchMode(GridView.STRETCH_COLUMN_WIDTH);  
44.                 gvBody.setVerticalSpacing(10);  
45.                 gvBody.setHorizontalSpacing(10);  
46.                 gvBody.setPadding(10, 10, 10, 10);  
47.                 gvBody.setGravity(Gravity.CENTER);  
48.                 gvBody.setOnItemClickListener(bodyClick);  
49.                 mLayout.addView(gvTitle);  
50.                 mLayout.addView(gvBody);  
51.                   
52.                 //設置默認項  
53.                 this.setContentView(mLayout);  
54.                 this.setWidth(LayoutParams.FILL_PARENT);  
55.                 this.setHeight(LayoutParams.WRAP_CONTENT);  
56.                 this.setBackgroundDrawable(new ColorDrawable(colorBgTabMenu));// 設置TabMenu菜單背景  
57.                 this.setAnimationStyle(aniTabMenu);  
58.                 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  
59.         }  
60.           
61.           
62.         public void SetTitleSelect(int index)  
63.         {  
64.                 gvTitle.setSelection(index);  
65.                 this.titleAdapter.SetFocus(index);  
66.         }  
67.           
68.         public void SetBodySelect(int index,int colorSelBody)  
69.         {  
70.                 int count=gvBody.getChildCount();  
71.                 for(int i=0;i<count;i++)  
72.                 {  
73.                         if(i!=index)  
74.                                 ((LinearLayout)gvBody.getChildAt(i)).setBackgroundColor(Color.TRANSPARENT);  
75.                 }  
76.                 ((LinearLayout)gvBody.getChildAt(index)).setBackgroundColor(colorSelBody);  
77.         }  
78.           
79.         public void SetBodyAdapter(MenuBodyAdapter bodyAdapter)  
80.         {  
81.                 gvBody.setAdapter(bodyAdapter);  
82.         }  
83.           
84.         /** 
85.          * 自定義Adapter，TabMenu的每個分頁的主體 
86.          *  
87.          */  
88.         static public class MenuBodyAdapter extends BaseAdapter {  
89.                 private Context mContext;  
90.                 private int fontColor,fontSize;  
91.                 private String[] texts;  
92.                 private int[] resID;  
93.                 /** 
94.                  * 設置TabMenu的分頁主體 
95.                  * @param context 調用方的上下文 
96.                  * @param texts 按鈕集合的字符串數組 
97.                  * @param resID 按鈕集合的圖標資源數組 
98.                  * @param fontSize 按鈕字體大小 
99.                  * @param color 按鈕字體顏色 
100.                  */  
101.                 public MenuBodyAdapter(Context context, String[] texts,int[] resID, int fontSize,int fontColor)   
102.                 {  
103.                         this.mContext = context;  
104.                         this.fontColor = fontColor;  
105.                         this.texts = texts;  
106.                         this.fontSize=fontSize;  
107.                         this.resID=resID;  
108.                 }  
109.                 public int getCount() {  
110.                         return texts.length;  
111.                 }  
112.                 public Object getItem(int position) {  
113.                           
114.                         return makeMenyBody(position);  
115.                 }  
116.                 public long getItemId(int position) {  
117.                         return position;  
118.                 }  
119.                   
120.                 private LinearLayout makeMenyBody(int position)  
121.                 {  
122.                         LinearLayout result=new LinearLayout(this.mContext);  
123.                         result.setOrientation(LinearLayout.VERTICAL);  
124.                         result.setGravity(Gravity.CENTER_HORIZONTAL|Gravity.CENTER_VERTICAL);          
125.                         result.setPadding(10, 10, 10, 10);  
126.                           
127.                         TextView text = new TextView(this.mContext);  
128.                         text.setText(texts[position]);  
129.                         text.setTextSize(fontSize);  
130.                         text.setTextColor(fontColor);  
131.                         text.setGravity(Gravity.CENTER);  
132.                         text.setPadding(5, 5, 5, 5);  
133.                         ImageView img=new ImageView(this.mContext);  
134.                         img.setBackgroundResource(resID[position]);  
135.                         result.addView(img,new LinearLayout.LayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT)));  
136.                         result.addView(text);  
137.                         return result;  
138.                 }  
139.                   
140.                 public View getView(int position, View convertView, ViewGroup parent) {  
141.                         return makeMenyBody(position);  
142.                 }  
143.         }  
144.           
145.           
146.         /** 
147.          * 自定義Adapter,TabMenu的分頁標簽部分 
148.          *  
149.          */  
150.         static public class MenuTitleAdapter extends BaseAdapter {  
151.                 private Context mContext;  
152.         private int fontColor,unselcolor,selcolor;  
153.         private TextView[] title;  
154.         /** 
155.          * 設置TabMenu的title 
156.          * @param context 調用方的上下文 
157.          * @param titles 分頁標簽的字符串數組 
158.          * @param fontSize 字體大小 
159.          * @param fontcolor 字體顏色 
160.          * @param unselcolor 未選中項的背景色 
161.          * @param selcolor 選中項的背景色 
162.          */  
163.         public MenuTitleAdapter(Context context, String[] titles, int fontSize,  
164.                 int fontcolor,int unselcolor,int selcolor) {  
165.             this.mContext = context;  
166.             this.fontColor = fontcolor;  
167.             this.unselcolor = unselcolor;  
168.             this.selcolor=selcolor;  
169.             this.title = new TextView[titles.length];  
170.             for (int i = 0; i < titles.length; i++) {  
171.                 title[i] = new TextView(mContext);  
172.                 title[i].setText(titles[i]);  
173.                 title[i].setTextSize(fontSize);  
174.                 title[i].setTextColor(fontColor);  
175.                 title[i].setGravity(Gravity.CENTER);  
176.                 title[i].setPadding(10, 10, 10, 10);  
177.             }  
178.         }  
179.         public int getCount() {  
180.             return title.length;  
181.         }  
182.         public Object getItem(int position) {  
183.             return title[position];  
184.         }  
185.         public long getItemId(int position) {  
186.             return title[position].getId();  
187.         }  
188.         /** 
189.          * 設置選中的效果 
190.          */  
191.         private void SetFocus(int index)  
192.         {  
193.                 for(int i=0;i<title.length;i++)  
194.                 {  
195.                         if(i!=index)  
196.                         {  
197.                                 title[i].setBackgroundDrawable(new ColorDrawable(unselcolor));//設置沒選中的顏色  
198.                     title[i].setTextColor(fontColor);//設置沒選中項的字體顏色  
199.                         }  
200.                 }  
201.                 title[index].setBackgroundColor(0x00);//設置選中項的顏色  
202.             title[index].setTextColor(selcolor);//設置選中項的字體顏色  
203.         }  
204.           
205.         public View getView(int position, View convertView, ViewGroup parent) {  
206.             View v;  
207.             if (convertView == null) {  
208.                 v = title[position];  
209.             } else {  
210.                 v = convertView;  
211.             }  
212.             return v;  
213.         }  
214.         }  
215. }  

       testTabMenu介紹了數據的定義以及TabMenu的使用，源碼如下：

1. package com.testTabMenu;  
2. import android.app.Activity;  
3. import android.graphics.Color;  
4. import android.os.Bundle;  
5. import android.view.Gravity;  
6. import android.view.Menu;  
7. import android.view.View;  
8. import android.widget.AdapterView;  
9. import android.widget.AdapterView.OnItemClickListener;  
10. import android.widget.Toast;  
11. public class testTabMenu extends Activity {  
12.         TabMenu.MenuBodyAdapter []bodyAdapter=new TabMenu.MenuBodyAdapter[3];  
13.         TabMenu.MenuTitleAdapter titleAdapter;  
14.         TabMenu tabMenu;  
15.         int selTitle=0;  
16.         @Override  
17.         public void onCreate(Bundle savedInstanceState) {  
18.                 super.onCreate(savedInstanceState);  
19.                 setContentView(R.layout.main);  
20.                 //設置分頁欄的標題  
21.                 titleAdapter = new TabMenu.MenuTitleAdapter(this, new String[] { "常用",  
22.                                 "設置", "工具" }, 16, 0xFF222222,Color.LTGRAY,Color.WHITE);  
23.                 //定義每項分頁欄的內容  
24.                 bodyAdapter[0]=new TabMenu.MenuBodyAdapter(this,new String[] { "常用1", "常用2", },   
25.                                  new int[] { R.drawable.menu_test,  
26.                                 R.drawable.menu_bookmark},13, 0xFFFFFFFF);  
27.                    
28.                 bodyAdapter[1]=new TabMenu.MenuBodyAdapter(this,new String[] { "設置1", "設置2",  
29.                                         "設置3"}, new int[] { R.drawable.menu_edit,  
30.                                         R.drawable.menu_delete, R.drawable.menu_fullscreen},13, 0xFFFFFFFF);  
31.                    
32.                 bodyAdapter[2]=new TabMenu.MenuBodyAdapter(this,new String[] { "工具1", "工具2",  
33.                                         "工具3", "工具4" }, new int[] { R.drawable.menu_copy,  
34.                                         R.drawable.menu_cut, R.drawable.menu_normalmode,  
35.                                         R.drawable.menu_quit },13, 0xFFFFFFFF);  
36.                    
37.                    
38.                 tabMenu=new TabMenu(this,  
39.                                  new TitleClickEvent(),  
40.                                  new BodyClickEvent(),  
41.                                  titleAdapter,  
42.                                  0x55123456,//TabMenu的背景顏色  
43.                                  R.style.PopupAnimation);//出現與消失的動畫  
44.                    
45.                  tabMenu.update();  
46.                  tabMenu.SetTitleSelect(0);  
47.                  tabMenu.SetBodyAdapter(bodyAdapter[0]);  
48.         }  
49.           
50.         class TitleClickEvent implements OnItemClickListener{  
51.                 @Override  
52.                 public void onItemClick(AdapterView arg0, View arg1, int arg2,  
53.                                 long arg3) {  
54.                         selTitle=arg2;  
55.                         tabMenu.SetTitleSelect(arg2);  
56.                         tabMenu.SetBodyAdapter(bodyAdapter[arg2]);  
57.                 }  
58.         }  
59.           
60.         class BodyClickEvent implements OnItemClickListener{  
61.                 @Override  
62.                 public void onItemClick(AdapterView arg0, View arg1, int arg2,  
63.                                 long arg3) {  
64.                         tabMenu.SetBodySelect(arg2,Color.GRAY);  
65.                         String str="第"+String.valueOf(selTitle)+"欄/n/r"  
66.                         +"第"+String.valueOf(arg2)+"項";  
67.                         Toast.makeText(testTabMenu.this, str, 500).show();  
68.                           
69.                 }  
70.                   
71.         }  
72.         @Override  
73.         /** 
74.          * 創建MENU 
75.          */  
76.         public boolean onCreateOptionsMenu(Menu menu) {  
77.                 menu.add("menu");// 必須創建一項  
78.                 return super.onCreateOptionsMenu(menu);  
79.         }  
80.         @Override  
81.         /** 
82.          * 攔截MENU 
83.          */  
84.         public boolean onMenuOpened(int featureId, Menu menu) {  
85.                 if (tabMenu != null) {  
86.                         if (tabMenu.isShowing())  
87.                                 tabMenu.dismiss();  
88.                         else {  
89.                                 tabMenu.showAtLocation(findViewById(R.id.LinearLayout01),  
90.                                                 Gravity.BOTTOM, 0, 0);  
91.                         }  
92.                 }  
93.                 return false;// 返回為true 則顯示系統menu  
94.         }  
95.           
96. }