发现Tag在View中还是很有作用的属性，API中这样描述的：
Tags
Unlike IDs, tags are not used to identify views. Tags are essentially an extra piece of information that can be associated with a view. They are most often used as a convenience to store data related to views in the views themselves rather than by putting them in a separate structure.
Tag不像ID是用标示view的。Tag从本质上来讲是就是相关联的view的额外的信息。它们经常用来存储一些view的数据，这样做非常方便而不用存入另外的单独结构。
下面这个例子是从eoe中看到的，给我很大启发：
[java]
public class FileListAdapter extends BaseAdapter { private LayoutInflater mInflater; private Bitmap mIcon_folder; private Bitmap mIcon_file; private Bitmap mIcon_image; private Bitmap mIcon_audio; private Bitmap mIcon_video; private Bitmap mIcon_apk; private List<String> items; private List<String> paths; private List<String> sizes; private int isZoom = 0; // MyAdapter的构造器 public FileListAdapter(Context context, List<String> it, List<String> pa, List<String> si, int zm) { mInflater = LayoutInflater.from(context); items = it; paths = pa; sizes = si; isZoom = zm; mIcon_folder = BitmapFactory.decodeResource(context.getResources(), R.drawable.folder); // 文件夹的图标 mIcon_file = BitmapFactory.decodeResource(context.getResources(), R.drawable.file); // 文件的图文件 mIcon_image = BitmapFactory.decodeResource(context.getResources(), R.drawable.image); // 图片的图文件 mIcon_audio = BitmapFactory.decodeResource(context.getResources(), R.drawable.audio); // 音频的图文件 mIcon_video = BitmapFactory.decodeResource(context.getResources(), R.drawable.video); // 视频的图文件 mIcon_apk = BitmapFactory.decodeResource(context.getResources(), R.drawable.apk); // apk文件 } @Override public int getCount() { return items.size(); } @Override public Object getItem(int position) { return items.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup par) { Bitmap bitMap = null; ViewHolder holder = null; if (convertView == null) { // 使用自定义的list_items作为Layout convertView = mInflater.inflate(R.layout.file_list_items, null); // 初始化holder的text与icon holder = new ViewHolder(); holder.f_title = ((TextView) convertView.findViewById(R.id.f_title)); holder.f_text = ((TextView) convertView.findViewById(R.id.f_text)); holder.f_icon = ((ImageView) convertView.findViewById(R.id.f_icon)); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } File f = new File(paths.get(position).toString()); // 设置文件或文件夹的文字与icon holder.f_title.setText(f.getName()); String f_type = MyUtil.getMIMEType(f, false); if (f.isDirectory()) { holder.f_icon.setImageBitmap(mIcon_folder); holder.f_text.setText(""); } else { holder.f_text.setText(sizes.get(position)); if ("image".equals(f_type)) { if (isZoom == 1) { bitMap = MyUtil.fitSizePic(f); if (bitMap != null) { holder.f_icon.setImageBitmap(bitMap); } else { holder.f_icon.setImageBitmap(mIcon_image); } } else { holder.f_icon.setImageBitmap(mIcon_image); } bitMap = null; } else if ("audio".equals(f_type)) { holder.f_icon.setImageBitmap(mIcon_audio); } else if ("video".equals(f_type)) { holder.f_icon.setImageBitmap(mIcon_video); } else if ("apk".equals(f_type)) { holder.f_icon.setImageBitmap(mIcon_apk); } else { holder.f_icon.setImageBitmap(mIcon_file); } } return convertView; } /** * 不单独写get set可以提高效率 class ViewHolder * */ private class ViewHolder { TextView f_title; TextView f_text; ImageView f_icon; } }