普通listviewadapter的定义

package com.hwtt.android.oa.adapter;

import java.util.ArrayList;
import java.util.List;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.hwtt.android.oa.activity.R;
import com.hwtt.android.oa.asyntask.DownloadAsyncTask;
import com.hwtt.android.oa.bean.BumphInfo;

/**
 * 公文列表适配器
 * 
 * @author Administrator
 * 
 */
public class RulesLvAdapter extends BaseAdapter {
    private Context mContext;

    public List<BumphInfo> listHashMap;
    ViewHolder vh;

    public RulesLvAdapter(Context context) {
        this.mContext = context;
        listHashMap = new ArrayList<BumphInfo>();

    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return listHashMap == null ? 0 : listHashMap.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        if (convertView == null) {
            vh = new ViewHolder();
            LayoutInflater layoutInflater = LayoutInflater.from(mContext);
            convertView = layoutInflater
                    .inflate(R.layout.public_listview, null);
            vh.title = (TextView) convertView
                    .findViewById(R.id.public_lv_titie);
            vh.time = (TextView) convertView.findViewById(R.id.public_lv_time);
            vh.acc = (ImageView) convertView.findViewById(R.id.public_lv_img);
            convertView.setTag(vh);
        } else {
            vh = (ViewHolder) convertView.getTag();
        }
        vh.title.setText(listHashMap.get(position).getTitle());
        vh.time.setText(listHashMap.get(position).getTime());
        if (listHashMap.get(position).getDownload() != null) {
            vh.acc.setVisibility(View.VISIBLE);
        } else {
            vh.acc.setVisibility(View.INVISIBLE);
        }
        vh.acc.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                new AlertDialog.Builder(mContext).setTitle(
                        R.string.dialog_point).setMessage(
                        R.string.dialog_download).setPositiveButton(
                        R.string.dialog_sure,
                        new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog,
                                    int which) {
                                String paths = listHashMap.get(position)
                                        .getDownload();

                                DownloadAsyncTask task = new DownloadAsyncTask(
                                        mContext,"");
                                task.execute(paths);

                            }
                        }).setNegativeButton(R.string.dialog_cannl, null)
                        .show();

            }
        });

        return convertView;
    }

    private class ViewHolder {
        TextView title, time;
        ImageView acc;
    }

}