Android ImageSwitcher 圖片切換 按鈕點擊切換

圖片顯示：

1. MainActivity

1. package com.gamedog.test;  
2.   
3. import Android.app.Activity;  
4. import android.os.Bundle;  
5. import android.view.View;  
6. import android.widget.Button;  
7. import android.widget.ImageSwitcher;  
8. import android.widget.ImageView;  
9. import android.widget.ViewSwitcher.ViewFactory;  
10.   
11. public class MainActivity extends Activity implements ViewFactory  
12. {  
13.   
14.     private ImageSwitcher switcher;  
15.     private Button forward;  
16.     private Button next;  
17.     // 圖片索引   
18.     private static int index = 0;  
19.     // 顯示的圖片資源   
20.   
21.     private static final Integer[] imagelist =  
22.     { R.drawable.img1, R.drawable.img2, R.drawable.img3, R.drawable.img4, R.drawable.img5, R.drawable.img6 };  
23.   
24.     @Override  
25.     public void onCreate(Bundle savedInstanceState)  
26.     {  
27.         super.onCreate(savedInstanceState);  
28.         setContentView(R.layout.main);  
29.   
30.         forward = (Button) findViewById(R.id.forward);  
31.         next = (Button) findViewById(R.id.next);  
32.         switcher = (ImageSwitcher) findViewById(R.id.image);  
33.         switcher.setFactory(this);  
34.         switcher.setImageResource(imagelist[index]);  
35.   
36.         // 上一張   
37.         forward.setOnClickListener(new View.OnClickListener()  
38.         {  
39.   
40.             @Override  
41.             public void onClick(View view)  
42.             {  
43.                 index--;  
44.                 if (index < 0)  
45.                 {  
46.                     index = imagelist.length - 1;  
47.                 }  
48.                 switcher.setImageResource(imagelist[index]);  
49.             }  
50.         });  
51.         // 下一張   
52.         next.setOnClickListener(new View.OnClickListener()  
53.         {  
54.   
55.             @Override  
56.             public void onClick(View view)  
57.             {  
58.                 index++;  
59.                 if (index >= imagelist.length)  
60.                 {  
61.                     index = 0;  
62.                 }  
63.                 switcher.setImageResource(imagelist[index]);  
64.             }  
65.         });  
66.     }  
67.   
68.     // 用於顯示圖片   
69.     @Override  
70.     public View makeView()  
71.     {  
72.         return new ImageView(this);  
73.     }  
74. }  

2.布局文件

1. <?xml version="1.0" encoding="utf-8"?>   
2. <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"   
3.             android:orientation="vertical"   
4.             android:layout_width="fill_parent"   
5.             android:layout_height="fill_parent">   
6.     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   
7.                   android:orientation="horizontal"   
8.                   android:layout_width="fill_parent"   
9.                   android:layout_height="fill_parent"   
10.                   android:gravity="center"  
11.                   android:background="#f0f0f0"  
12.             >   
13.         <Button   
14.                 android:id="@+id/forward"   
15.                 android:layout_width="wrap_content"   
16.                 android:layout_height="wrap_content"   
17.                 android:background="@drawable/left_btn"  
18.                 android:layout_gravity="center"  
19.                 />   
20.         <ImageSwitcher   
21.                 android:id="@+id/image"   
22.                 android:layout_width="wrap_content"   
23.                 android:layout_height="wrap_content"   
24.                 android:layout_marginLeft="20dp"  
25.                 android:layout_marginRight="20dp"  
26.                 />   
27.         <Button   
28.                 android:id="@+id/next"   
29.                 android:layout_width="wrap_content"   
30.                 android:layout_height="wrap_content"   
31.                 android:background="@drawable/right_btn"  
32.                  android:layout_gravity="center"  
33.                 />   
34.    
35.     </LinearLayout>   
36. </ScrollView>