好记性不如烂笔杆android学习笔记<十六> switcher和gallery

xml文件

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout 
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     android:id="@+id/launch_linear"
 5     android:layout_width="fill_parent" 
 6     android:layout_height="fill_parent"
 7     android:background="@color/halftransparent"
 8     android:orientation="vertical"
 9     >
10    <ImageSwitcher
11         android:id="@+id/switcher"
12         android:layout_width="320dp"
13         android:layout_height="400dp"
14         android:background="@color/pink"
15         android:gravity="center"
16         />
17    
18     <Gallery
19         android:id="@+id/gallery"
20         android:layout_width="fill_parent"
21         android:layout_height="wrap_content"
22         android:background="@color/blue"
23         android:layout_marginTop="10dip"
24         android:unselectedAlpha="0.6"
25         android:spacing="2pt"/>
26 </LinearLayout>

Java文件

 1 public class ChangeTheme extends Activity {
 2     //定义图片资源
 3     private int[] images = new int[]{
 4        R.drawable.paper_01,
 5        R.drawable.paper_02,
 6        R.drawable.paper_03,
 7        R.drawable.paper_04,
 8        R.drawable.paper_05,
 9        R.drawable.paper_06,
10        R.drawable.paper_07
11        
12     };
13  
14     ImageSwitcher switcher ; //声明ImageSwitcher对象，图片显示区域
15     Gallery gallery;   //声明Gallery对象，图片列表索引
16     @Override
17     public void onCreate(Bundle savedInstanceState) {
18          super.onCreate(savedInstanceState);
19          setContentView(R.layout.theme_activity);
20        
21         //获取对象
22          switcher = (ImageSwitcher)this.findViewById(R.id.switcher);
23          gallery = (Gallery)this.findViewById(R.id.gallery);
24        
25        
26          switcher.setFactory(new ViewFactory(){
27             public View makeView() {
28                  ImageView imageView = new ImageView(ChangeTheme.this);
29                  imageView.setBackgroundColor(0x00ff00);
30                  imageView.setScaleType(ImageView.ScaleType.CENTER);
31 //                 imageView.setLayoutParams(new ImageSwitcher.LayoutParams
32 //                          (LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
33                  
34                  imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
35                          LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
36                  return imageView;
37             }
38         });
39         //设置切换动画效果
40         switcher.setInAnimation(this, android.R.anim.slide_in_left);
41         switcher.setOutAnimation(this, android.R.anim.fade_out);
42        
43         //创建Gallery的adapter
44         BaseAdapter adapter = new BaseAdapter(){
45             public int getCount() {
46                 return images.length;
47             }
48             public Object getItem(int position) {
49                 return images[position];
50             }
51             public long getItemId(int position) {
52                 return position;
53             }
54             //该方法返回的view代表每个列表项
55            
56             public View getView(int position, View convertView, ViewGroup parent) {
57                 ImageView imageView = new ImageView(ChangeTheme.this);
58                 imageView.setImageResource(images[position%images.length]);
59                 imageView.setScaleType(ScaleType.FIT_XY);
60                 imageView.setLayoutParams(new Gallery.LayoutParams(75, 100));
61                 //设置自定义属性
62                 /*TypedArray typeArray = obtainStyledAttributes(R.styleable.Gallery);
63                 imageView.setBackgroundResource(typeArray.getResourceId(
64                             R.styleable.Gallery_android_galleryItemBackground, 0));*/
65                 return imageView;
66            }
67         };
68        
69         gallery.setAdapter(adapter);
70         //Gallery便表现选择时间
71         gallery.setOnItemSelectedListener(new OnItemSelectedListener(){
72            public void onItemSelected(AdapterView<?> parent, View v, int position,long id) {
73                switcher.setImageResource(images[position % images.length]);
74            }
75            public void onNothingSelected(AdapterView<?> arg0) {}
76         });
77     }
78     
79 }