Android LruCache图片异步加载工具类

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使用LruCache进行图片异步缓存加载
AsyncImageLoader2.java
import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStream;import java.lang.ref.SoftReference;import java.net.URL;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Handler;import android.os.Message;import android.util.LruCache;/** * 图片异步加载工具类 *  * @version V2.0 */public class AsyncImageLoader2 {private LruCache<String, SoftReference<Bitmap>> imageCache = new LruCache<String, SoftReference<Bitmap>>(100);private static ExecutorService executorService = Executors.newFixedThreadPool(10);public AsyncImageLoader2() {imageCache = new LruCache<String, SoftReference<Bitmap>>(100);}public AsyncImageLoader2(int maxSize) {imageCache = new LruCache<String, SoftReference<Bitmap>>(maxSize);}public Bitmap loadImage(final String imageUrl,final ImageCallback imageCallback, final boolean isZoom) {SoftReference<Bitmap> softReference = imageCache.get(imageUrl);if (softReference != null) {Bitmap bitmap = softReference.get();if (bitmap != null && !bitmap.isRecycled()) {return bitmap;}}final Handler handler = new Handler() {public void handleMessage(Message message) {imageCallback.imageLoaded((Bitmap) message.obj, imageUrl);}};executorService.submit(new Runnable() {@Overridepublic void run() {Bitmap bitmap = null;if (imageUrl.startsWith("http")) {bitmap = loadImageFromNet(imageUrl, isZoom);} else {bitmap = loadImageFromLocal(imageUrl, isZoom);}if (bitmap != null) {imageCache.put(imageUrl, new SoftReference<Bitmap>(bitmap));Message message = handler.obtainMessage(0, bitmap);handler.sendMessage(message);}}});return null;}public interface ImageCallback {public void imageLoaded(Bitmap bitmap, String imageUrl);}private Bitmap loadImageFromLocal(String path, boolean isZoom) {Bitmap bitmap = null;try {BitmapFactory.Options opts = new BitmapFactory.Options();opts.inPreferredConfig = Bitmap.Config.RGB_565;if (isZoom) {opts.inSampleSize = 2;}opts.inPurgeable = true;opts.inInputShareable = true;InputStream is = new FileInputStream(new File(path));bitmap = BitmapFactory.decodeStream(is, null, opts);} catch (FileNotFoundException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}return bitmap;}private Bitmap loadImageFromNet(String imageUrl, boolean isZoom) {Bitmap bitmap = null;try {String fileName = imageUrl.substring(imageUrl.lastIndexOf("/") + 1);bitmap = loadImageFromLocal(FileUtils.SDCARD_BACKUP_IMAGE+ fileName, isZoom);if (bitmap == null) {URL url = new URL(imageUrl);InputStream is = url.openStream();FileUtils.saveImage(is, fileName);BitmapFactory.Options opts = new BitmapFactory.Options();opts.inJustDecodeBounds = false;if (isZoom) {opts.inSampleSize = 2;}opts.inPurgeable = true;opts.inInputShareable = true;bitmap = BitmapFactory.decodeStream(is, null, opts);}} catch (Exception e) {e.printStackTrace();return null;}return bitmap;}public void removeFromContainer(String key) {SoftReference<Bitmap> softReference = imageCache.get(key);if (softReference != null) {Bitmap bitmap = softReference.get();if (bitmap != null && !bitmap.isRecycled()) {bitmap.recycle();softReference.clear();}}}}
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