Android编程学习之异步加载图片的方法

public void Clean(ImageView image) { for (int j = 0; j < picturesToLoad.size();) {

if (picturesToLoad.get(j).imageView == image) picturesToLoad.remove(j);

else ++j;

} }

} // 图片加载线程

class PicturesLoader extends Thread { public void run() {

try { while (true) {

// 线程等待直到有图片加载在队列中 if (picturesQueue.picturesToLoad.size() == 0)

synchronized (picturesQueue.picturesToLoad) { picturesQueue.picturesToLoad.wait();

} if (picturesQueue.picturesToLoad.size() != 0) {

PictureToLoad photoToLoad; synchronized (picturesQueue.picturesToLoad) {

photoToLoad = picturesQueue.picturesToLoad.pop(); }

Bitmap bmp = getBitmap(photoToLoad.url); // 写到手机内存中

memoryCache.put(photoToLoad.url, bmp); String tag = imageViews.get(photoToLoad.imageView);

if (tag != null && tag.equals(photoToLoad.url)) { BitmapDisplayer bd = new BitmapDisplayer(bmp,

photoToLoad.imageView); Activity activity = (Activity) photoToLoad.imageView

.getContext(); activity.runOnUiThread(bd);

} }

if (Thread.interrupted()) break;

} } catch (InterruptedException e) {

// 在这里允许线程退出 }

} }

// 在UI线程中显示Bitmap图像 class BitmapDisplayer implements Runnable {

Bitmap bitmap; ImageView imageView;

public BitmapDisplayer(Bitmap bitmap, ImageView imageView) { this.bitmap = bitmap;

this.imageView = imageView; }