使用开源imageLoader优化listview加载大量本地图片的demo

package com.example.listviewdemo;import java.util.ArrayList;import java.util.Collections;import java.util.LinkedList;import java.util.List;import android.database.Cursor;import android.graphics.Bitmap;import android.os.Bundle;import android.provider.MediaStore;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import com.nostra13.universalimageloader.core.DisplayImageOptions;import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;import com.smalt.smaltmap.utils.GlobalConstant;/** *  * @Title: * @Description:ListView显示大量图片 * @Copyright: Copyright (c) 2014 * @Company:  * @author: Administrator * @version: 1.0.0.0 * @Date: 2014-2-14 */public class MainActivity01 extends AbsListViewBaseActivity {DisplayImageOptions options; // 配置图片加载及显示选项ListView lvShow;/** * 存储图片地址 */ArrayList<String> listImgPath;String[] imageUriArray;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);lvShow = (ListView) findViewById(R.id.lv_show);// 扫描内存中图片并存入listlistImgPath = getImgPathList();if (listImgPath.size() < 1) {GlobalConstant.i("sd卡中无图片");} else {// list转成数组imageUriArray = (String[]) listImgPath.toArray(new String[listImgPath.size()]);// 配置图片加载及显示选项（还有一些其他的配置，查阅doc文档吧）options = new DisplayImageOptions.Builder().showStubImage(R.drawable.ic_launcher) // 在ImageView加载过程中显示图片.showImageForEmptyUri(R.drawable.ic_launcher) // image连接地址为空时.showImageOnFail(R.drawable.ic_launcher) // image加载失败.cacheInMemory(true) // 加载图片时会在内存中加载缓存.cacheOnDisc(true) // 加载图片时会在磁盘中加载缓存.displayer(new RoundedBitmapDisplayer(20)) // 设置用户加载图片task(这里是圆角图片显示).build();// 加载适配器lvShow.setAdapter(new AdapterList());}}@Overridepublic void onBackPressed() {AnimateFirstDisplayListener.displayedImages.clear();super.onBackPressed();}/** *  * 获取图片地址列表 *  * @return list */private ArrayList<String> getImgPathList() {ArrayList<String> list = new ArrayList<String>();Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,new String[] { "_id", "_data" }, null, null, null);while (cursor.moveToNext()) {list.add(cursor.getString(1));// 将图片路径添加到list中}cursor.close();return list;}/** 图片加载监听事件 **/private static class AnimateFirstDisplayListener extendsSimpleImageLoadingListener {static final List<String> displayedImages = Collections.synchronizedList(new LinkedList<String>());@Overridepublic void onLoadingComplete(String imageUri, View view,Bitmap loadedImage) {if (loadedImage != null) {ImageView imageView = (ImageView) view;boolean firstDisplay = !displayedImages.contains(imageUri);if (firstDisplay) {FadeInBitmapDisplayer.animate(imageView, 500); // 设置image隐藏动画500msdisplayedImages.add(imageUri); // 将图片uri添加到集合中}}}}/** *  * @Title: * @Description:listview适配器 * @Copyright: Copyright (c) 2014 * @Company:  * @author: Administrator * @version: 1.0.0.0 * @Date: 2014-2-14 */class AdapterList extends BaseAdapter {private ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();@Overridepublic int getCount() {// TODO Auto-generated method stubreturn imageUriArray.length;}/** * 构造方法 */public AdapterList() {// TODO Auto-generated constructor stub}@Overridepublic Object getItem(int arg0) {// TODO Auto-generated method stubreturn arg0;}/* * (non-Javadoc) *  * @see android.widget.Adapter#getItemId(int) */@Overridepublic long getItemId(int arg0) {// TODO Auto-generated method stubreturn arg0;}/* * (non-Javadoc) *  * @see android.widget.Adapter#getView(int, android.view.View, * android.view.ViewGroup) */@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder;if (convertView == null) {holder = new ViewHolder();// 初始化绑定控件convertView = getLayoutInflater().inflate(R.layout.layout_item, null);holder.imgShow = (ImageView) findViewById(R.id.img_show);holder.tvShow = (TextView) findViewById(R.id.tv_show);// add to convertViewconvertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}// 设置img，text具体显示的内容holder.tvShow.setText("fuck" + (position));imageLoader.displayImage(imageUriArray[position], holder.imgShow,options, animateFirstListener);return convertView;}}static class ViewHolder {ImageView imgShow;TextView tvShow;}}

demo下载:

https://drive.google.com/file/d/0B3vXJifsRl4bTk8wUFpyNk9lNEU/edit?usp=sharing