android-修改gridView高亮颜色

如题，如何修改gridView中的imageView的高亮颜色？

public View getView(int position, View convertView, ViewGroup parent) {

    ImageView imageView;
    if (convertView == null) {  // if it's not recycled, initialize some attributes
        imageView = new ImageView(mContext);
        imageView.setLayoutParams(new GridView.LayoutParams(width, height));
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
        imageView.setBackgroundResource(R.drawable.menu_beh);
     //   imageView.setPadding(8, 8, 8, 8);
    } else {
        imageView = (ImageView) convertView;
    }
    String s=(String)HiveApp.mgd[position].posters[2].image.url;
 //   imageView.setImageDrawable(getPicture(items[position]));
   HiveApp.id.download(s, imageView); 
  //     id.DisplayImage(s, imageView);
    return imageView;
}

高亮 没搞懂 应该是selector 选中时变换的背景吧