Android 使用Gallery实现Tab

main.xml布局文件: 

Java代码  

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical" android:layout_width="fill_parent"  
4.     android:layout_height="fill_parent">  
5.     <Gallery android:id="@+id/gallery" android:layout_width="fill_parent"  
6.         android:layout_height="wrap_content" android:layout_marginTop="30dp"  
7.         android:unselectedAlpha="1" android:spacing="1dip" />  
8. </LinearLayout>  

values/attrs.xml: 

Java代码  

1. <?xml version="1.0" encoding="utf-8"?>  
2. <resources>  
3.     <declare-styleable name="Gallery">  
4.         <attr name="android:galleryItemBackground" />  
5.     </declare-styleable>  
6. </resources>  

values/strings.xml: 

Java代码  

1. <?xml version="1.0" encoding="utf-8"?>    
2. <resources>    
3.     <string name="hello">Hello World, Date!</string>    
4.     <string name="app_name">丸子-Widget</string>    
5. </resources>    

drawable/tab_button_select.xml: 

Java代码  

1. <?xml version="1.0" encoding="utf-8"?>  
2. <shape xmlns:android="http://schemas.android.com/apk/res/android">  
3.     <gradient android:startColor="#FF1B1B1B" android:endColor="#FF969696"  
4.         android:angle="90.0">  
5.     </gradient>  
6. </shape>  

drawable/tab_button_unselect.xml: 

Java代码  

1. <?xml version="1.0" encoding="utf-8"?>  
2. <shape xmlns:android="http://schemas.android.com/apk/res/android">  
3.     <gradient android:startColor="#FF000000" android:endColor="#FF474747"  
4.         android:angle="90.0">  
5.     </gradient>  
6. </shape>  

IaiaiActivity.java类: 

Java代码  

1. package com.iaiai.activity;  
2.   
3. import java.util.Arrays;  
4. import java.util.Collections;  
5. import java.util.List;  
6.   
7. import android.app.Activity;  
8. import android.content.Context;  
9. import android.content.res.TypedArray;  
10. import android.graphics.Color;  
11. import android.os.Bundle;  
12. import android.view.Gravity;  
13. import android.view.View;  
14. import android.view.ViewGroup;  
15. import android.widget.AdapterView;  
16. import android.widget.AdapterView.OnItemClickListener;  
17. import android.widget.BaseAdapter;  
18. import android.widget.Gallery;  
19. import android.widget.TextView;  
20.   
21. /** 
22.  *  
23.  * <p> 
24.  * Title: IaiaiActivity.java 
25.  * </p> 
26.  * <p> 
27.  * E-Mail: 176291935@qq.com 
28.  * </p> 
29.  * <p> 
30.  * QQ: 176291935 
31.  * </p> 
32.  * <p> 
33.  * Http: iaiai.iteye.com 
34.  * </p> 
35.  * <p> 
36.  * Create time: 2011-6-26 
37.  * </p> 
38.  *  
39.  * @author 丸子 
40.  * @version 0.0.1 
41.  */  
42. public class IaiaiActivity extends Activity {  
43.   
44.     private Gallery gallery;  
45.     private TabAdapter textAdapter;  
46.   
47.     private static final String[] PROGRAM_NAMES = { "中央一台", "中央二台", "中央三台",  
48.             "中央四台", "中央五台", "中央六台", "中央七台", "中央八台", };  
49.   
50.     @Override  
51.     public void onCreate(Bundle savedInstanceState) {  
52.         super.onCreate(savedInstanceState);  
53.         setContentView(R.layout.main);  
54.   
55.         gallery = (Gallery) findViewById(R.id.gallery);  
56.         textAdapter = new TabAdapter(this, Arrays.asList(PROGRAM_NAMES));  
57.         gallery.setAdapter(textAdapter);  
58.         gallery.setOnItemClickListener(new OnItemClickListener() {  
59.   
60.             @Override  
61.             public void onItemClick(AdapterView<?> parent, View view,  
62.                     int position, long id) {  
63.                 TabAdapter adapter = (TabAdapter) parent.getAdapter();  
64.                 adapter.setSelectedPos(position);  
65.             }  
66.   
67.         });  
68.     }  
69.   
70.     public class TabAdapter extends BaseAdapter {  
71.         private Context mContext;  
72.         private List<String> mList;  
73.         private int mSelectedPos;  
74.   
75.         public TabAdapter(Context context, List<String> list) {  
76.             mContext = context;  
77.             TypedArray a = obtainStyledAttributes(R.styleable.Gallery);  
78.             a.recycle();  
79.             if (list == null)  
80.                 list = Collections.emptyList();  
81.             mList = list;  
82.         }  
83.   
84.         public void setSelectedPos(int pos) {  
85.             if (pos != mSelectedPos) {  
86.                 mSelectedPos = pos;  
87.                 notifyDataSetChanged();  
88.             }  
89.         }  
90.   
91.         public int getSelectedPos() {  
92.             return mSelectedPos;  
93.         }  
94.   
95.         public int getCount() {  
96.             return mList.size();  
97.         }  
98.   
99.         public Object getItem(int position) {  
100.             return mList.get(position);  
101.         }  
102.   
103.         public long getItemId(int position) {  
104.             return position;  
105.         }  
106.   
107.         public View getView(int position, View convertView, ViewGroup parent) {  
108.             TextView text = null;  
109.             if (convertView == null) {  
110.                 text = new TextView(mContext);  
111.             } else {  
112.                 text = (TextView) convertView;  
113.             }  
114.   
115.             text.setTextColor(Color.WHITE);  
116.             text.setText(mList.get(position));  
117.   
118.             text.setLayoutParams(new Gallery.LayoutParams(102, 40));  
119.             text.setGravity(Gravity.CENTER);  
120.   
121.             if (position == mSelectedPos)  
122.                 text.setBackgroundResource(R.drawable.tab_button_select);  
123.             else  
124.                 text.setBackgroundResource(R.drawable.tab_button_unselect);  
125.   
126.             return text;  
127.         }  
128.     }  
129.   
130. }  

运行结果: