关于gallery和imagineadapter的一点问题，求助

imagineadapter的代码
package com.arc;import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;public class ImageAdapter extends BaseAdapter { // 定义Context
private Context mContext;
// 定义整型数组 即图片源,  news1,news2,news3存放在 mImagineIds的数组中
private Integer[] mImageIds = { R.drawable.news1, R.drawable.news2,
R.drawable.news3 }; // 声明ImageAdapter
public ImageAdapter(Context c) {
mContext = c;
} // 获取图片的个数
public int getCount() {
return Integer.MAX_VALUE;
} // 获取图片在库中的位置
public Object getItem(int position) {
return position;
} // 获取图片ID
public long getItemId(int position) {
return position;
} public View getView(int position, View convertView, ViewGroup parent) {
// ImageView imageview = new ImageView(mContext);
//
// // 给ImageView设置资源
// imageview.setImageResource(mImageIds[position]);
// // 设置布局 图片120*120
// imageview.setLayoutParams(new Gallery.LayoutParams(120, 120));
// // 设置显示比例类型
// imageview.setScaleType(ImageView.ScaleType.FIT_CENTER);
//
// return imageview;

//下面的方法实现了循环播放。。
 /* 创建一个ImageView对象 */
      ImageView i = new ImageView(this.mContext);
      i.setPadding(10, 10, 10, 10);
      i.setLayoutParams(new Gallery.LayoutParams(300, 150));
      //i.setAlpha(80);
      // i.setImageResource(this.myImageIds[position]);
      if(position<0){
        position =position+mImageIds.length;
      }
      i.setImageResource(this.mImageIds[position% mImageIds.length]);
      i.setScaleType(ImageView.ScaleType.FIT_XY);
      //i.setBackgroundResource(mGalleryItemBackground);
      /* 设置这个ImageView对象的宽高，单位为dip */
      //i.setLayoutParams(new Gallery.LayoutParams(85, 72));
      return i;
}
}gallery的代码
package com.arc;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;public class gallery_Act extends Activity
{
private ImageView[] mImageViewIds;// 小圆点ImageView数组  
    private static final int IMAGE_COUNT = 3;// 小圆点个数  
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mImageViewIds = new ImageView[] { 
         (ImageView) findViewById(R.id.dot_1),  
                (ImageView) findViewById(R.id.dot_2),  
                (ImageView) findViewById(R.id.dot_3)};
        
        
//gallery
Gallery g = (Gallery) findViewById(R.id.gallery);
g.setAdapter(new ImageAdapter(this));
g.setSelection(200);
g.setOnItemClickListener(new GalleryItemListener());
g.setOnItemSelectedListener((OnItemSelectedListener) new GalleryItemSelectedListener());    
    }
class GalleryItemListener implements OnItemClickListener {
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Toast.makeText(gallery_Act.this, "你选择了" + (position + 1) + " 号图片",
Toast.LENGTH_SHORT).show(); }
}

    class GalleryItemSelectedListener implements OnItemSelectedListener {  
     
        public void onItemSelected(AdapterView<?> parent, View view,  
                int position, long id) {  
            int pos = position % IMAGE_COUNT;  
            mImageViewIds[pos].setImageDrawable(getBaseContext().getResources()  
                    .getDrawable(R.drawable.ic_dot_focused));  
//            if (pos > 0) {  
//                mImageViewIds[pos - 1].setImageDrawable(getBaseContext()  
//                        .getResources().getDrawable(R.drawable.ic_dot_normal));  
//            }  
//            if (pos < (IMAGE_COUNT - 1)) {  
//                mImageViewIds[pos + 1].setImageDrawable(getBaseContext()  
//                        .getResources().getDrawable(R.drawable.ic_dot_normal));  
//            }  
//            if (pos == 0) {  
//                mImageViewIds[IMAGE_COUNT - 1]  
//                        .setImageDrawable(getBaseContext().getResources()  
//                        .getDrawable(R.drawable.ic_dot_normal));  
//            }  
            if (pos == 1) {  
              mImageViewIds[2]  
                      .setImageDrawable(getBaseContext().getResources()  
                      .getDrawable(R.drawable.ic_dot_normal));
              mImageViewIds[0]  
                      .setImageDrawable(getBaseContext().getResources()  
                      .getDrawable(R.drawable.ic_dot_normal));
          } 
            if (pos == 2) {  
                mImageViewIds[1]  
                        .setImageDrawable(getBaseContext().getResources()  
                        .getDrawable(R.drawable.ic_dot_normal));
                mImageViewIds[0]  
                        .setImageDrawable(getBaseContext().getResources()  
                        .getDrawable(R.drawable.ic_dot_normal));
            } 
            if (pos == 0) {  
                mImageViewIds[1]  
                        .setImageDrawable(getBaseContext().getResources()  
                        .getDrawable(R.drawable.ic_dot_normal));
                mImageViewIds[2]  
                        .setImageDrawable(getBaseContext().getResources()  
                        .getDrawable(R.drawable.ic_dot_normal));
            } 
        } public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub

}  
}

} 
最后输出的时候三张图片（news1，news2，news3）没有显示，这是为什么？androidimageadaptergallery