ImageListAdapter.java

package com.wanku.fragment;

import java.util.List;
import java.util.Map;

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

import com.ab.bitmap.AbImageDownloader;
import com.ab.global.AbConstant;
import com.wanku.R;
import com.wanku.R.drawable;
import com.wanku.R.id;

/**
 * Copyright (c) 2011 All rights reserved 名称：MyListViewAdapter
 * 描述：在Adapter中释放Bitmap
 * 
 * @author zhaoqp
 * @date 2011-12-10
 * @version
 */
public class ImageListAdapter extends BaseAdapter {

	private static String TAG = "ImageListAdapter";
	private Context mContext;
	// xml转View对象
	private LayoutInflater mInflater;
	// 单行的布局
	private int mResource;
	// 列表展现的数据
	private List mData;
	// Map中的key
	private String[] mFrom;
	// view的id
	private int[] mTo;
	// 图片下载器
	private AbImageDownloader mAbImageDownloader = null;

	/**
	 * 构造方法
	 * 
	 * @param context
	 * @param data
	 *            列表展现的数据
	 * @param resource
	 *            单行的布局
	 * @param from
	 *            Map中的key
	 * @param to
	 *            view的id
	 */
	public ImageListAdapter(Context context, List data, int resource,
			String[] from, int[] to) {
		this.mContext = context;
		this.mData = data;
		this.mResource = resource;
		this.mFrom = from;
		this.mTo = to;
		// 用于将xml转为View
		this.mInflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		// 图片下载器
		mAbImageDownloader = new AbImageDownloader(mContext);
		mAbImageDownloader.setWidth(240);
		mAbImageDownloader.setHeight(400);
		mAbImageDownloader.setType(AbConstant.SCALEIMG);
		mAbImageDownloader.setLoadingImage(R.drawable.image_loading);
		mAbImageDownloader.setErrorImage(R.drawable.image_error);
		mAbImageDownloader.setNoImage(R.drawable.image_no);
		// mAbImageDownloader.setAnimation(true);
	}

	@Override
	public int getCount() {
		return mData.size();
	}

	@Override
	public Object getItem(int position) {
		return mData.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		final ViewHolder holder;
		if (convertView == null) {
			// 使用自定义的list_items作为Layout
			convertView = mInflater.inflate(mResource, parent, false);
			// 减少findView的次数
			holder = new ViewHolder();
			// 初始化布局中的元素
			holder.itemsIcon = ((ImageView) convertView.findViewById(mTo[0]));
			holder.itemsTitle = ((TextView) convertView.findViewById(mTo[1]));
			holder.itemsText = ((TextView) convertView.findViewById(mTo[2]));
			convertView.setTag(holder);
		} else {
			holder = (ViewHolder) convertView.getTag();
		}

		// 获取该行的数据
		@SuppressWarnings("unchecked")
		final Map<String, Object> obj = (Map<String, Object>) mData
				.get(position);
		String imageUrl = (String) obj.get("itemsIcon");
		holder.itemsTitle.setText((String) obj.get("itemsTitle"));
		holder.itemsText.setText((String) obj.get("itemsText"));
		// 设置加载中的View
		mAbImageDownloader.setLoadingView(convertView
				.findViewById(R.id.progressBar));
		// 图片的下载
		mAbImageDownloader.display(holder.itemsIcon, imageUrl);

		return convertView;
	}

	/**
	 * View元素
	 */
	static class ViewHolder {
		ImageView itemsIcon;
		TextView itemsTitle;
		TextView itemsText;
		ImageButton itemsBtn;
	}

}