Gallery gallery = (Gallery) findViewById(R.id.gallery); 

ImageAdapter。 gallery.setAdapter(new ImageAdapter(this));

private Integer[] mps = { 
  R.drawable.icon1, 
  R.drawable.icon2, 
  R.drawable.icon3, 
  R.drawable.icon4, 
  R.drawable.icon5 
}; 

public class ImageAdapter extends BaseAdapter { 
 private Context mContext; 
  public ImageAdapter(Context context) { 
  mContext = context; 
 } 
 
 public int getCount() { 
  return mps.length; 
 } 
 
 public Object getItem(int position) { 
  return position; 
 } 
 
 public long getItemId(int position) { 
  return position; 
 } 
 
 public View getView(int position, View convertView, ViewGroup parent) { 
  ImageView image = new ImageView(mContext); 
  image.setImageResource(mps[position]); 
  image.setAdjustViewBounds(true); 
  image.setLayoutParams(new Gallery.LayoutParams( 
   LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
  return image; 
 } 
} 

gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
 @Override 
 public void onItemSelected(AdapterView<?> parent, View v,int position, long id) { 
 } 
 
 @Override 
 public void onNothingSelected(AdapterView<?> arg0) { 
 //这里不做响应 
 } 
}); 

private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2) {
 return e2.getX() > e1.getX();
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
  float velocityY) {
 int kEvent;
 if (isScrollingLeft(e1, e2)) {
  kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
 } else {
  kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
 }
 onKeyDown(kEvent, null);
 return true;
}

@Override
 public int getCount() {
  // TODO Auto-generated method stub
  return Integer.MAX_VALUE;
 }
 
 ……
 
 @Override
 public View getView(int position, View convertView, ViewGroup arg2) {
  // TODO Auto-generated method stub
  ImageView imageView = new ImageView(context);
  imageView.setBackgroundResource(imagList.get(position%imagList.size()));
  imageView.setScaleType(ScaleType.FIT_XY);
  imageView.setLayoutParams(new Gallery.LayoutParams(Gallery.LayoutParams.FILL_PARENT
    , Gallery.LayoutParams.WRAP_CONTENT));
  return imageView;
 } 

//定时器和事件处理5秒刷新一次幻灯片
/** 展示图控制器，实现展示图切换 */
 final Handler handler_gallery = new Handler() {
  public void handleMessage(Message msg) {
   /* 自定义屏幕按下的动作 */
   MotionEvent e1 = MotionEvent.obtain(SystemClock.uptimeMillis(),
     SystemClock.uptimeMillis(), MotionEvent.ACTION_UP,
     89.333336f, 265.33334f, 0);
   /* 自定义屏幕放开的动作 */
   MotionEvent e2 = MotionEvent.obtain(SystemClock.uptimeMillis(),
     SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN,
     300.0f, 238.00003f, 0);
    
   myGallery.onFling(e2, e1, -800, 0);
   /* 给gallery添加按下和放开的动作，实现自动滑动 */
   super.handleMessage(msg);
  }
 };
 protected void onResume() {
  autogallery();
  super.onResume();
 };
 private void autogallery() {
  /* 设置定时器，每5秒自动切换展示图 */
  Timer time = new Timer();
  TimerTask task = new TimerTask() {
   @Override
   public void run() {
    Message m = new Message();
    handler_gallery.sendMessage(m);
   }
  };
  time.schedule(task, 8000, 5000);
 }
//指示按钮和gallery初始化过程以及事件监听添加过程
//初始化
 void init(){
  myGallery = (DetailGallery)findViewById(R.id.myGallery);
  gallery_points = (RadioGroup) this.findViewById(R.id.galleryRaidoGroup);
  ArrayList<Integer> list = new ArrayList<Integer>();
  list.add(R.drawable.banner1);
  list.add(R.drawable.banner2);
  list.add(R.drawable.banner3);
  list.add(R.drawable.banner4);
  GalleryIndexAdapter adapter = new GalleryIndexAdapter(list, context);
  myGallery.setAdapter(adapter);
  //设置小按钮
  gallery_point = new RadioButton[list.size()];
  for (int i = 0; i < gallery_point.length; i++) {
   layout = (LinearLayout) inflater.inflate(R.layout.gallery_icon, null);
   gallery_point[i] = (RadioButton) layout.findViewById(R.id.gallery_radiobutton);
   gallery_point[i].setId(i);/* 设置指示图按钮ID */
   int wh = Tool.dp2px(context, 10);
   RadioGroup.LayoutParams layoutParams = new RadioGroup.LayoutParams(wh, wh); // 设置指示图大小
   gallery_point[i].setLayoutParams(layoutParams);
   layoutParams.setMargins(4, 0, 4, 0);// 设置指示图margin值
   gallery_point[i].setClickable(false);/* 设置指示图按钮不能点击 */
   layout.removeView(gallery_point[i]);//一个子视图不能指定了多个父视图
   gallery_points.addView(gallery_point[i]);/* 把已经初始化的指示图动态添加到指示图的RadioGroup中 */
  }
 }
 //添加事件
 void addEvn(){
  myGallery.setOnItemSelectedListener(new OnItemSelectedListener() {
 
   @Override
   public void onItemSelected(AdapterView<?> arg0, View arg1,
     int arg2, long arg3) {
    // TODO Auto-generated method stub
    gallery_points.check(gallery_point[arg2%gallery_point.length].getId());
   }
 
   @Override
   public void onNothingSelected(AdapterView<?> arg0) {
    // TODO Auto-generated method stub
     
   }
  });
 }

//由于是测试case，所以图片都是写死的为了区别，在position = 1的时候换了一张图片
public View getView(int position, View convertView, ViewGroup parent) {
   // TODO Auto-generated method stub
   ImageView imageView = (ImageView) LayoutInflater.from(context).inflate(R.layout.img,
     null);
   Bitmap bitmap = null;
   try {
    if(position == 1 ){
     bitmap = BitmapFactory.decodeStream(assetManager.open("xpic11247_s.jpg"));
     imageView.setTag("xpic11247_s.jpg");
    }
    else{
     bitmap = BitmapFactory.decodeStream(assetManager.open("item0_pic.jpg"));
     imageView.setTag("item0_pic.jpg");
    }
     
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   // 加载图片之前进行缩放
   int width = bitmap.getWidth();
   int height = bitmap.getHeight();
   float newHeight = 200;
   float newWidth = width*newHeight/height;
   float scaleWidth = ((float) newWidth) / width;
   float scaleHeight = ((float) newHeight) / height;
   // 取得想要缩放的matrix参数
   Matrix matrix = new Matrix();
   matrix.postScale(scaleWidth, scaleHeight);
   // 得到新的图片
   Bitmap newbm = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
   System.out.println(newbm.getHeight()+"-----------"+newbm.getWidth());
   imageView.setImageBitmap(newbm);
   // }
   return imageView;
 
  }

<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/waterfall_image"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:background="@drawable/image_border"
 >
</ImageView>

layout.removeView(gallery_point[i]);//一个子视图不能指定了多个父视图