Android ListView 异步加载图片

使用ListView、GridView来展示图片是项目中经常遇到的情况，这里使用官方文档的BitmapFun稍作修改实现ListView 异步加载图片效果。

实现原理：给ListView 注册一个 滚动监听器，监听的ListView的滚动状态，为了不影响用户滑动ListView 感觉卡顿，只有当ListView处于静止或者触摸状态时才去开启后台线程下载图片，处于滚动状态时后台的线程应该 暂停加载图片。

工程目录结构如下：

最后实现的效果如下：

第一次进入时

滑动ListView时

activity_main.xml布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <ListView        android:id="@+id/mListView"        android:layout_width="match_parent"        android:layout_height="match_parent"         android:cacheColorHint="@android:color/transparent"/></RelativeLayout>

ImageItem.java

package com.example.lrucachetest;public class ImageItem {private String url;private String desc;public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public String getDesc() {return desc;}public void setDesc(String desc) {this.desc = desc;}}

MainActivity.java

package com.example.lrucachetest;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.os.Bundle;import android.support.v4.app.FragmentActivity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import com.example.lrucachetest.util.ImageCache.ImageCacheParams;import com.example.lrucachetest.util.ImageFetcher;public class MainActivity extends FragmentActivity {public final static String[] imageUrls = new String[] {"https://lh6.googleusercontent.com/-55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s1024/A%252520Photographer.jpg","https://lh4.googleusercontent.com/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-gnuLQfNnBA/s1024/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg","https://lh5.googleusercontent.com/-7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s1024/Another%252520Rockaway%252520Sunset.jpg","https://lh3.googleusercontent.com/--L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s1024/Antelope%252520Butte.jpg","https://lh6.googleusercontent.com/-8HO-4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s1024/Antelope%252520Hallway.jpg","https://lh4.googleusercontent.com/-WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s1024/Antelope%252520Walls.jpg","https://lh6.googleusercontent.com/-UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s1024/Apre%2525CC%252580s%252520la%252520Pluie.jpg","https://lh3.googleusercontent.com/-s-AFpvgSeew/URquc6dF-JI/AAAAAAAAAbs/Mt3xNGRUd68/s1024/Backlit%252520Cloud.jpg","https://lh5.googleusercontent.com/-bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s1024/Bee%252520and%252520Flower.jpg","https://lh5.googleusercontent.com/-n7mdm7I7FGs/URqueT_BT-I/AAAAAAAAAbs/9MYmXlmpSAo/s1024/Bonzai%252520Rock%252520Sunset.jpg","https://lh6.googleusercontent.com/-4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s1024/Caterpillar.jpg","https://lh3.googleusercontent.com/-rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s1024/Chess.jpg","https://lh5.googleusercontent.com/-WVpRptWH8Yw/URqugh-QmDI/AAAAAAAAAbs/E-MgBgtlUWU/s1024/Chihuly.jpg","https://lh5.googleusercontent.com/-0BDXkYmckbo/URquhKFW84I/AAAAAAAAAbs/ogQtHCTk2JQ/s1024/Closed%252520Door.jpg","https://lh3.googleusercontent.com/-PyggXXZRykM/URquh-kVvoI/AAAAAAAAAbs/hFtDwhtrHHQ/s1024/Colorado%252520River%252520Sunset.jpg","https://lh3.googleusercontent.com/-ZAs4dNZtALc/URquikvOCWI/AAAAAAAAAbs/DXz4h3dll1Y/s1024/Colors%252520of%252520Autumn.jpg","https://lh4.googleusercontent.com/-GztnWEIiMz8/URqukVCU7bI/AAAAAAAAAbs/jo2Hjv6MZ6M/s1024/Countryside.jpg","https://lh4.googleusercontent.com/-bEg9EZ9QoiM/URquklz3FGI/AAAAAAAAAbs/UUuv8Ac2BaE/s1024/Death%252520Valley%252520-%252520Dunes.jpg","https://lh6.googleusercontent.com/-ijQJ8W68tEE/URqulGkvFEI/AAAAAAAAAbs/zPXvIwi_rFw/s1024/Delicate%252520Arch.jpg","https://lh5.googleusercontent.com/-Oh8mMy2ieng/URqullDwehI/AAAAAAAAAbs/TbdeEfsaIZY/s1024/Despair.jpg","https://lh5.googleusercontent.com/-gl0y4UiAOlk/URqumC_KjBI/AAAAAAAAAbs/PM1eT7dn4oo/s1024/Eagle%252520Fall%252520Sunrise.jpg","https://lh3.googleusercontent.com/-hYYHd2_vXPQ/URqumtJa9eI/AAAAAAAAAbs/wAalXVkbSh0/s1024/Electric%252520Storm.jpg","https://lh5.googleusercontent.com/-PyY_yiyjPTo/URqunUOhHFI/AAAAAAAAAbs/azZoULNuJXc/s1024/False%252520Kiva.jpg","https://lh6.googleusercontent.com/-PYvLVdvXywk/URqunwd8hfI/AAAAAAAAAbs/qiMwgkFvf6I/s1024/Fitzgerald%252520Streaks.jpg","https://lh4.googleusercontent.com/-KIR_UobIIqY/URquoCZ9SlI/AAAAAAAAAbs/Y4d4q8sXu4c/s1024/Foggy%252520Sunset.jpg","https://lh6.googleusercontent.com/-9lzOk_OWZH0/URquoo4xYoI/AAAAAAAAAbs/AwgzHtNVCwU/s1024/Frantic.jpg","https://lh3.googleusercontent.com/-0X3JNaKaz48/URqupH78wpI/AAAAAAAAAbs/lHXxu_zbH8s/s1024/Golden%252520Gate%252520Afternoon.jpg","https://lh6.googleusercontent.com/-95sb5ag7ABc/URqupl95RDI/AAAAAAAAAbs/g73R20iVTRA/s1024/Golden%252520Gate%252520Fog.jpg","https://lh3.googleusercontent.com/-JB9v6rtgHhk/URqup21F-zI/AAAAAAAAAbs/64Fb8qMZWXk/s1024/Golden%252520Grass.jpg","https://lh4.googleusercontent.com/-EIBGfnuLtII/URquqVHwaRI/AAAAAAAAAbs/FA4McV2u8VE/s1024/Grand%252520Teton.jpg","https://lh4.googleusercontent.com/-WoMxZvmN9nY/URquq1v2AoI/AAAAAAAAAbs/grj5uMhL6NA/s1024/Grass%252520Closeup.jpg","https://lh3.googleusercontent.com/-6hZiEHXx64Q/URqurxvNdqI/AAAAAAAAAbs/kWMXM3o5OVI/s1024/Green%252520Grass.jpg","https://lh5.googleusercontent.com/-6LVb9OXtQ60/URquteBFuKI/AAAAAAAAAbs/4F4kRgecwFs/s1024/Hanging%252520Leaf.jpg","https://lh4.googleusercontent.com/-zAvf__52ONk/URqutT_IuxI/AAAAAAAAAbs/D_bcuc0thoU/s1024/Highway%2525201.jpg","https://lh6.googleusercontent.com/-H4SrUg615rA/URquuL27fXI/AAAAAAAAAbs/4aEqJfiMsOU/s1024/Horseshoe%252520Bend%252520Sunset.jpg","https://lh4.googleusercontent.com/-JhFi4fb_Pqw/URquuX-QXbI/AAAAAAAAAbs/IXpYUxuweYM/s1024/Horseshoe%252520Bend.jpg","https://lh5.googleusercontent.com/-UGgssvFRJ7g/URquueyJzGI/AAAAAAAAAbs/yYIBlLT0toM/s1024/Into%252520the%252520Blue.jpg","https://lh3.googleusercontent.com/-CH7KoupI7uI/URquu0FF__I/AAAAAAAAAbs/R7GDmI7v_G0/s1024/Jelly%252520Fish%2525202.jpg","https://lh4.googleusercontent.com/-pwuuw6yhg8U/URquvPxR3FI/AAAAAAAAAbs/VNGk6f-tsGE/s1024/Jelly%252520Fish%2525203.jpg","https://lh5.googleusercontent.com/-GoUQVw1fnFw/URquv6xbC0I/AAAAAAAAAbs/zEUVTQQ43Zc/s1024/Kauai.jpg","https://lh6.googleusercontent.com/-8QdYYQEpYjw/URquwvdh88I/AAAAAAAAAbs/cktDy-ysfHo/s1024/Kyoto%252520Sunset.jpg","https://lh4.googleusercontent.com/-vPeekyDjOE0/URquwzJ28qI/AAAAAAAAAbs/qxcyXULsZrg/s1024/Lake%252520Tahoe%252520Colors.jpg","https://lh4.googleusercontent.com/-xBPxWpD4yxU/UR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};private List<ImageItem> mList;private ImageFetcher mImageFetcher;private int mImageThumbSize;private static final String IMAGE_CACHE_DIR = "thumbs";private ImageAdapter mAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mImageThumbSize = getResources().getDimensionPixelSize(R.dimen.image_display_size);ImageCacheParams cacheParams = new ImageCacheParams(this,IMAGE_CACHE_DIR);cacheParams.setMemCacheSizePercent(0.25f); // Set memory cache to 25% of app memorymImageFetcher = new ImageFetcher(this, mImageThumbSize);mImageFetcher.setLoadingImage(R.drawable.empty_photo);mImageFetcher.addImageCache(getSupportFragmentManager(), cacheParams);initAppData();findView();}private void initAppData() {mList = new ArrayList<ImageItem>();for (int i = 0; i < imageUrls.length; i++) {ImageItem it = new ImageItem();it.setUrl(imageUrls[i]);it.setDesc("LRUCache Test API" + (i + 1));mList.add(it);}}private void findView() {ListView mListView = (ListView) findViewById(R.id.mListView);mAdapter = new ImageAdapter(this, mList);mListView.setAdapter(mAdapter);mListView.setOnScrollListener(new OnScrollListener() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {if(scrollState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) {mImageFetcher.setPauseWork(true);} else {mImageFetcher.setPauseWork(false);}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {// TODO Auto-generated method stub}});}@Overridepublic void onResume() {super.onResume();mImageFetcher.setExitTasksEarly(false);mAdapter.notifyDataSetChanged();}@Overridepublic void onPause() {super.onPause();mImageFetcher.setPauseWork(false);mImageFetcher.setExitTasksEarly(true);mImageFetcher.flushCache();}@Overridepublic void onDestroy() {super.onDestroy();mImageFetcher.closeCache();}private class ImageAdapter extends BaseAdapter {private Context context;private List<ImageItem> list;private LayoutInflater mInflater;public ImageAdapter(Context context, List<ImageItem> list) {this.context = context;this.list = list;mInflater = LayoutInflater.from(context);}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn list.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn list.get(position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder;if (convertView == null) {holder = new ViewHolder();convertView = mInflater.inflate(R.layout.list_item, null);holder.iv_photo = (ImageView) convertView.findViewById(R.id.iv_photo);holder.tv_desc = (TextView) convertView.findViewById(R.id.tv_desc);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}ImageItem it = list.get(position);mImageFetcher.loadImage(it.getUrl(), holder.iv_photo);holder.tv_desc.setText(it.getDesc());return convertView;}}static class ViewHolder {TextView tv_desc;ImageView iv_photo;}}

util包中的代码就不贴了，完全取自官方文档BitmapFun 里面的代码，大家可以下载工程后自己去研究。

最后附上工程下载地址：http://download.csdn.net/detail/fx_sky/6312015