重写BaseAdapter的样例

（1）用于ListView,用来设置每项的背景

package com.studio.basf.libs;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.studio.basf.android.R;

/**
 * 自定义ListView适配器-Square
 * @author lhb-JewLeo
 */
public class SquareAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    private List<String> list;

    //自定义容器类
    class ViewHolder {
        private TextView TvName;
        private RelativeLayout ReLayout;
        
        public TextView getTvName() {
            return TvName;
        }
        public void setTvName(TextView tvName) {
            TvName = tvName;
        }
        public RelativeLayout getReLayout() {
            return ReLayout;
        }
        public void setReLayout(RelativeLayout reLayout) {
            ReLayout = reLayout;
        }
    }

    public SquareAdapter(List<String> list, Context context) {
        this.list = list;
        this.mInflater = LayoutInflater.from(context);
    }

    public int getCount() {
        // TODO Auto-generated method stub
        return list.size();
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return list.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ViewHolder holder = null;
        if (convertView == null) {
            holder = new ViewHolder();

            convertView = mInflater
                    .inflate(R.layout.square_item_view, null);
            holder.setTvName((TextView) convertView
                    .findViewById(R.id.tvItemName));
            holder.setReLayout((RelativeLayout) convertView
                    .findViewById(R.id.relativeSquare));

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.getTvName().setText(list.get(position));
        if (position == 0) {
            holder.getReLayout().setBackgroundResource(R.drawable.circle_list_top);
        } else if (position == getCount() - 1) {
            holder.getReLayout().setBackgroundResource(R.drawable.circle_list_bottom);
        } else {               
            holder.getReLayout().setBackgroundResource(R.drawable.circle_list_middle);
        }

        return convertView;
    }

}

（2）动态改变ListView项中某个显示字段的内容



package com.studio.basf.libs;

import java.util.ArrayList;
import java.util.HashMap;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class CustomListAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    private ArrayList<HashMap<String, String>> list;
    private int resource;
    private String[] from;
    private int[] to;

    // 自定义容器类
    class ViewHolder {
        private ArrayList<TextView> tvCollections;

        public ArrayList<TextView> getTvCollections() {
            return tvCollections;
        }

        public void setTvCollections(ArrayList<TextView> tvCollections) {
            this.tvCollections = tvCollections;
        }
    }

    public CustomListAdapter(Context context,
            ArrayList<HashMap<String, String>> list, int resource,
            String[] from, int[] to) {
        this.list = list;
        this.mInflater = LayoutInflater.from(context);
        this.resource = resource;
        this.from = from;
        this.to = to;
    }

    public int getCount() {
        // TODO Auto-generated method stub
        return list.size();
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return list.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ViewHolder holder = null;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = mInflater.inflate(resource, null);

            ArrayList<TextView> tvList = new ArrayList<TextView>();
            for (int i = 0; i < to.length; i++) {
                tvList.add((TextView) convertView.findViewById(to[i]));
            }
            holder.setTvCollections(tvList);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        // 获取单项数据
        HashMap<String, String> hashMap = list.get(position);

        if (hashMap.get("isValid").trim().equals("失败")) {
            hashMap.remove("showvalidpoint");
        } 

        // 绑定到视图上
        for (int i = 0; i < to.length; i++) {
            holder.getTvCollections().get(i).setText(hashMap.get(from[i]));
        }

        return convertView;
    }
}