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

xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/launch_linear"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:background="@color/halftransparent"
    android:orientation="vertical"
    >
   <ImageSwitcher
        android:id="@+id/switcher"
        android:layout_width="320dp"
        android:layout_height="400dp"
        android:background="@color/pink"
        android:gravity="center"
        />
   
    <Gallery
        android:id="@+id/gallery"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@color/blue"
        android:layout_marginTop="10dip"
        android:unselectedAlpha="0.6"
        android:spacing="2pt"/>
</LinearLayout>

Java文件

public class ChangeTheme extends Activity {
    //定义图片资源
    private int[] images = new int[]{
       R.drawable.paper_01,
       R.drawable.paper_02,
       R.drawable.paper_03,
       R.drawable.paper_04,
       R.drawable.paper_05,
       R.drawable.paper_06,
       R.drawable.paper_07
       
    };
 
    ImageSwitcher switcher ; //声明ImageSwitcher对象，图片显示区域
    Gallery gallery;   //声明Gallery对象，图片列表索引
    @Override
    public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.theme_activity);
       
        //获取对象
         switcher = (ImageSwitcher)this.findViewById(R.id.switcher);
         gallery = (Gallery)this.findViewById(R.id.gallery);
       
       
         switcher.setFactory(new ViewFactory(){
            public View makeView() {
                 ImageView imageView = new ImageView(ChangeTheme.this);
                 imageView.setBackgroundColor(0x00ff00);
                 imageView.setScaleType(ImageView.ScaleType.CENTER);
//                 imageView.setLayoutParams(new ImageSwitcher.LayoutParams
//                          (LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
                 
                 imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
                         LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
                 return imageView;
            }
        });
        //设置切换动画效果
        switcher.setInAnimation(this, android.R.anim.slide_in_left);
        switcher.setOutAnimation(this, android.R.anim.fade_out);
       
        //创建Gallery的adapter
        BaseAdapter adapter = new BaseAdapter(){
            public int getCount() {
                return images.length;
            }
            public Object getItem(int position) {
                return images[position];
            }
            public long getItemId(int position) {
                return position;
            }
            //该方法返回的view代表每个列表项
           
            public View getView(int position, View convertView, ViewGroup parent) {
                ImageView imageView = new ImageView(ChangeTheme.this);
                imageView.setImageResource(images[position%images.length]);
                imageView.setScaleType(ScaleType.FIT_XY);
                imageView.setLayoutParams(new Gallery.LayoutParams(75, 100));
                //设置自定义属性
                /*TypedArray typeArray = obtainStyledAttributes(R.styleable.Gallery);
                imageView.setBackgroundResource(typeArray.getResourceId(
                            R.styleable.Gallery_android_galleryItemBackground, 0));*/
                return imageView;
           }
        };
       
        gallery.setAdapter(adapter);
        //Gallery便表现选择时间
        gallery.setOnItemSelectedListener(new OnItemSelectedListener(){
           public void onItemSelected(AdapterView<?> parent, View v, int position,long id) {
               switcher.setImageResource(images[position % images.length]);
           }
           public void onNothingSelected(AdapterView<?> arg0) {}
        });
    }
    
}