利用LruCache为GridView异步加载大量网络图片完整示例

MainActivity如下:

package cc.testlrucache;import android.os.Bundle;
import android.widget.GridView;
import android.app.Activity;
/*** Demo描述:* 在GridView中采用LruCache异步加载大量图片,避免OOM* * 学习资料:* http://blog.csdn.net/guolin_blog/article/details/9526203* Thank you very much*/public class MainActivity extends Activity {private GridView mGridView;private GridViewAdapter mGridViewAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}private void init(){mGridView = (GridView) findViewById(R.id.gridView);mGridViewAdapter = new GridViewAdapter(this, 0, ImagesUrl.Urls, mGridView);mGridView.setAdapter(mGridViewAdapter);}//取消所有的下载任务@Overrideprotected void onDestroy() {super.onDestroy();mGridViewAdapter.cancelAllTasks();}}

GridViewAdapter如下:

package cc.testlrucache;import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashSet;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.support.v4.util.LruCache;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.ImageView;
/*** LruCache的流程分析:* 我们从第一次进入应用的情况下开始* 1 依据图片的Url从LruCache缓存中取图片.*   若图片存在缓存中,则显示该图片;否则显示默认图片* 2 因为是第一次进入该界面所以会执行:*   loadBitmaps(firstVisibleItem, visibleItemCount);*   我们从loadBitmaps()方法作为切入点,继续往下梳理* 3 尝试从LruCache缓存中取图片.如果在显示即可,否则进入4* 4 开启一个异步任务下载图片.下载完成后显示图片,并且将*   该图片存入LruCache缓存中*   * 在停止滑动时,会调用loadBitmaps(firstVisibleItem, visibleItemCount)* 情况与上类似*/
@SuppressLint("NewApi")
public class GridViewAdapter extends ArrayAdapter<String> {private GridView mGridView;//图片缓存类private LruCache<String, Bitmap> mLruCache;//记录所有正在下载或等待下载的任务private HashSet<DownloadBitmapAsyncTask> mDownloadBitmapAsyncTaskHashSet;//GridView中可见的第一张图片的下标private int mFirstVisibleItem;//GridView中可见的图片的数量private int mVisibleItemCount;//记录是否是第一次进入该界面private boolean isFirstEnterThisActivity = true;public GridViewAdapter(Context context, int textViewResourceId,String[] objects, GridView gridView) {super(context, textViewResourceId, objects);mGridView = gridView;mGridView.setOnScrollListener(new ScrollListenerImpl());mDownloadBitmapAsyncTaskHashSet = new HashSet<DownloadBitmapAsyncTask>();// 获取应用程序最大可用内存int maxMemory = (int) Runtime.getRuntime().maxMemory();// 设置图片缓存大小为maxMemory的1/6int cacheSize = maxMemory/6;mLruCache = new LruCache<String, Bitmap>(cacheSize) {@Overrideprotected int sizeOf(String key, Bitmap bitmap) {return bitmap.getByteCount();}};}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {String url = getItem(position);View view;if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(R.layout.gridview_item, null);} else {view = convertView;}ImageView imageView = (ImageView) view.findViewById(R.id.imageView);//为该ImageView设置一个Tag,防止图片错位imageView.setTag(url);//为该ImageView设置显示的图片setImageForImageView(url, imageView);return view;}/*** 为ImageView设置图片(Image)* 1 从缓存中获取图片* 2 若图片不在缓存中则为其设置默认图片*/private void setImageForImageView(String imageUrl, ImageView imageView) {Bitmap bitmap = getBitmapFromLruCache(imageUrl);if (bitmap != null) {imageView.setImageBitmap(bitmap);} else {imageView.setImageResource(R.drawable.default_image);}}/*** 将图片存储到LruCache*/public void addBitmapToLruCache(String key, Bitmap bitmap) {if (getBitmapFromLruCache(key) == null) {mLruCache.put(key, bitmap);}}/*** 从LruCache缓存获取图片*/public Bitmap getBitmapFromLruCache(String key) {return mLruCache.get(key);}/*** 为GridView的item加载图片* * @param firstVisibleItem * GridView中可见的第一张图片的下标* * @param visibleItemCount * GridView中可见的图片的数量* */private void loadBitmaps(int firstVisibleItem, int visibleItemCount) {try {for (int i = firstVisibleItem; i < firstVisibleItem + visibleItemCount; i++) {String imageUrl = ImagesUrl.Urls[i];Bitmap bitmap = getBitmapFromLruCache(imageUrl);if (bitmap == null) {DownloadBitmapAsyncTask downloadBitmapAsyncTask = new DownloadBitmapAsyncTask();mDownloadBitmapAsyncTaskHashSet.add(downloadBitmapAsyncTask);downloadBitmapAsyncTask.execute(imageUrl);} else {//依据Tag找到对应的ImageView显示图片ImageView imageView = (ImageView) mGridView.findViewWithTag(imageUrl);if (imageView != null && bitmap != null) {imageView.setImageBitmap(bitmap);}}}} catch (Exception e) {e.printStackTrace();}}/*** 取消所有正在下载或等待下载的任务*/public void cancelAllTasks() {if (mDownloadBitmapAsyncTaskHashSet != null) {for (DownloadBitmapAsyncTask task : mDownloadBitmapAsyncTaskHashSet) {task.cancel(false);}}}private class ScrollListenerImpl implements OnScrollListener{/*** * 我们的本意是通过onScrollStateChanged获知:每次GridView停止滑动时加载图片* 但是存在一个特殊情况:* 当第一次入应用的时候,此时并没有滑动屏幕的操作即不会调用onScrollStateChanged,但应该加载图片.* 所以在此处做一个特殊的处理.* 即代码:* if (isFirstEnterThisActivity && visibleItemCount > 0) {*      loadBitmaps(firstVisibleItem, visibleItemCount);*      isFirstEnterThisActivity = false;*    }*    * ------------------------------------------------------------* * 其余的都是正常情况.* 所以我们需要不断保存:firstVisibleItem和visibleItemCount* 从而便于中在onScrollStateChanged()判断当停止滑动时加载图片* */@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {mFirstVisibleItem = firstVisibleItem;mVisibleItemCount = visibleItemCount;if (isFirstEnterThisActivity && visibleItemCount > 0) {loadBitmaps(firstVisibleItem, visibleItemCount);isFirstEnterThisActivity = false;}}/***  GridView停止滑动时下载图片*  其余情况下取消所有正在下载或者等待下载的任务*/@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {if (scrollState == SCROLL_STATE_IDLE) {loadBitmaps(mFirstVisibleItem, mVisibleItemCount);} else {cancelAllTasks();}}}/*** 下载图片的异步任务*/class DownloadBitmapAsyncTask extends AsyncTask<String, Void, Bitmap> {private String imageUrl;@Overrideprotected Bitmap doInBackground(String... params) {imageUrl = params[0];Bitmap bitmap = downloadBitmap(params[0]);if (bitmap != null) {//下载完后,将其缓存到LrcCacheaddBitmapToLruCache(params[0], bitmap);}return bitmap;}@Overrideprotected void onPostExecute(Bitmap bitmap) {super.onPostExecute(bitmap);//下载完成后,找到其对应的ImageView显示图片ImageView imageView = (ImageView) mGridView.findViewWithTag(imageUrl);if (imageView != null && bitmap != null) {imageView.setImageBitmap(bitmap);}mDownloadBitmapAsyncTaskHashSet.remove(this);}}// 获取Bitmapprivate Bitmap downloadBitmap(String imageUrl) {Bitmap bitmap = null;HttpURLConnection httpURLConnection = null;try {URL url = new URL(imageUrl);httpURLConnection = (HttpURLConnection) url.openConnection();httpURLConnection.setConnectTimeout(5 * 1000);httpURLConnection.setReadTimeout(10 * 1000);httpURLConnection.setDoInput(true);httpURLConnection.setDoOutput(true);bitmap = BitmapFactory.decodeStream(httpURLConnection.getInputStream());} catch (Exception e) {e.printStackTrace();} finally {if (httpURLConnection != null) {httpURLConnection.disconnect();}}return bitmap;}}

ImagesUrl如下:

package cc.testlrucache;public class ImagesUrl {public final static String[] Urls = new String[] {"https://lh6.googleusercontent.com/-55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s160-c/A%252520Photographer.jpg","https://lh4.googleusercontent.com/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-gnuLQfNnBA/s160-c/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg","https://lh5.googleusercontent.com/-7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s160-c/Another%252520Rockaway%252520Sunset.jpg","https://lh3.googleusercontent.com/--L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s160-c/Antelope%252520Butte.jpg","https://lh6.googleusercontent.com/-8HO-4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s160-c/Antelope%252520Hallway.jpg","https://lh4.googleusercontent.com/-WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s160-c/Antelope%252520Walls.jpg","https://lh6.googleusercontent.com/-UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s160-c/Apre%2525CC%252580s%252520la%252520Pluie.jpg","https://lh3.googleusercontent.com/-s-AFpvgSeew/URquc6dF-JI/AAAAAAAAAbs/Mt3xNGRUd68/s160-c/Backlit%252520Cloud.jpg","https://lh5.googleusercontent.com/-bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s160-c/Bee%252520and%252520Flower.jpg","https://lh5.googleusercontent.com/-n7mdm7I7FGs/URqueT_BT-I/AAAAAAAAAbs/9MYmXlmpSAo/s160-c/Bonzai%252520Rock%252520Sunset.jpg","https://lh6.googleusercontent.com/-4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s160-c/Caterpillar.jpg","https://lh3.googleusercontent.com/-rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s160-c/Chess.jpg","https://lh5.googleusercontent.com/-WVpRptWH8Yw/URqugh-QmDI/AAAAAAAAAbs/E-MgBgtlUWU/s160-c/Chihuly.jpg","https://lh5.googleusercontent.com/-0BDXkYmckbo/URquhKFW84I/AAAAAAAAAbs/ogQtHCTk2JQ/s160-c/Closed%252520Door.jpg","https://lh3.googleusercontent.com/-PyggXXZRykM/URquh-kVvoI/AAAAAAAAAbs/hFtDwhtrHHQ/s160-c/Colorado%252520River%252520Sunset.jpg","https://lh3.googleusercontent.com/-ZAs4dNZtALc/URquikvOCWI/AAAAAAAAAbs/DXz4h3dll1Y/s160-c/Colors%252520of%252520Autumn.jpg","https://lh4.googleusercontent.com/-GztnWEIiMz8/URqukVCU7bI/AAAAAAAAAbs/jo2Hjv6MZ6M/s160-c/Countryside.jpg","https://lh4.googleusercontent.com/-bEg9EZ9QoiM/URquklz3FGI/AAAAAAAAAbs/UUuv8Ac2BaE/s160-c/Death%252520Valley%252520-%252520Dunes.jpg","https://lh6.googleusercontent.com/-ijQJ8W68tEE/URqulGkvFEI/AAAAAAAAAbs/zPXvIwi_rFw/s160-c/Delicate%252520Arch.jpg","https://lh5.googleusercontent.com/-Oh8mMy2ieng/URqullDwehI/AAAAAAAAAbs/TbdeEfsaIZY/s160-c/Despair.jpg","https://lh5.googleusercontent.com/-gl0y4UiAOlk/URqumC_KjBI/AAAAAAAAAbs/PM1eT7dn4oo/s160-c/Eagle%252520Fall%252520Sunrise.jpg","https://lh3.googleusercontent.com/-hYYHd2_vXPQ/URqumtJa9eI/AAAAAAAAAbs/wAalXVkbSh0/s160-c/Electric%252520Storm.jpg","https://lh5.googleusercontent.com/-PyY_yiyjPTo/URqunUOhHFI/AAAAAAAAAbs/azZoULNuJXc/s160-c/False%252520Kiva.jpg","https://lh6.googleusercontent.com/-PYvLVdvXywk/URqunwd8hfI/AAAAAAAAAbs/qiMwgkFvf6I/s160-c/Fitzgerald%252520Streaks.jpg","https://lh4.googleusercontent.com/-KIR_UobIIqY/URquoCZ9SlI/AAAAAAAAAbs/Y4d4q8sXu4c/s160-c/Foggy%252520Sunset.jpg","https://lh6.googleusercontent.com/-9lzOk_OWZH0/URquoo4xYoI/AAAAAAAAAbs/AwgzHtNVCwU/s160-c/Frantic.jpg","https://lh3.googleusercontent.com/-0X3JNaKaz48/URqupH78wpI/AAAAAAAAAbs/lHXxu_zbH8s/s160-c/Golden%252520Gate%252520Afternoon.jpg","https://lh6.googleusercontent.com/-95sb5ag7ABc/URqupl95RDI/AAAAAAAAAbs/g73R20iVTRA/s160-c/Golden%252520Gate%252520Fog.jpg","https://lh3.googleusercontent.com/-JB9v6rtgHhk/URqup21F-zI/AAAAAAAAAbs/64Fb8qMZWXk/s160-c/Golden%252520Grass.jpg","https://lh4.googleusercontent.com/-EIBGfnuLtII/URquqVHwaRI/AAAAAAAAAbs/FA4McV2u8VE/s160-c/Grand%252520Teton.jpg","https://lh4.googleusercontent.com/-WoMxZvmN9nY/URquq1v2AoI/AAAAAAAAAbs/grj5uMhL6NA/s160-c/Grass%252520Closeup.jpg","https://lh3.googleusercontent.com/-6hZiEHXx64Q/URqurxvNdqI/AAAAAAAAAbs/kWMXM3o5OVI/s160-c/Green%252520Grass.jpg","https://lh5.googleusercontent.com/-6LVb9OXtQ60/URquteBFuKI/AAAAAAAAAbs/4F4kRgecwFs/s160-c/Hanging%252520Leaf.jpg","https://lh4.googleusercontent.com/-zAvf__52ONk/URqutT_IuxI/AAAAAAAAAbs/D_bcuc0thoU/s160-c/Highway%2525201.jpg","https://lh6.googleusercontent.com/-H4SrUg615rA/URquuL27fXI/AAAAAAAAAbs/4aEqJfiMsOU/s160-c/Horseshoe%252520Bend%252520Sunset.jpg","https://lh4.googleusercontent.com/-JhFi4fb_Pqw/URquuX-QXbI/AAAAAAAAAbs/IXpYUxuweYM/s160-c/Horseshoe%252520Bend.jpg","https://lh5.googleusercontent.com/-UGgssvFRJ7g/URquueyJzGI/AAAAAAAAAbs/yYIBlLT0toM/s160-c/Into%252520the%252520Blue.jpg","https://lh3.googleusercontent.com/-CH7KoupI7uI/URquu0FF__I/AAAAAAAAAbs/R7GDmI7v_G0/s160-c/Jelly%252520Fish%2525202.jpg","https://lh4.googleusercontent.com/-pwuuw6yhg8U/URquvPxR3FI/AAAAAAAAAbs/VNGk6f-tsGE/s160-c/Jelly%252520Fish%2525203.jpg","https://lh5.googleusercontent.com/-GoUQVw1fnFw/URquv6xbC0I/AAAAAAAAAbs/zEUVTQQ43Zc/s160-c/Kauai.jpg","https://lh6.googleusercontent.com/-8QdYYQEpYjw/URquwvdh88I/AAAAAAAAAbs/cktDy-ysfHo/s160-c/Kyoto%252520Sunset.jpg","https://lh4.googleusercontent.com/-vPeekyDjOE0/URquwzJ28qI/AAAAAAAAAbs/qxcyXULsZrg/s160-c/Lake%252520Tahoe%252520Colors.jpg","https:/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};
}

main.xml如下:

<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" ><GridViewandroid:id="@+id/gridView"android:layout_width="match_parent"android:layout_height="wrap_content"android:columnWidth="90dip"android:gravity="center"android:numColumns="auto_fit"android:stretchMode="columnWidth"android:verticalSpacing="10dip"/></RelativeLayout>

gridview_item.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="wrap_content"android:layout_height="wrap_content" ><ImageView android:id="@+id/imageView"android:layout_width="90dip"android:layout_height="90dip"android:src="@drawable/default_image"android:layout_centerInParent="true"/></RelativeLayout>

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