/**
* 执行网络请求加载图片
*
* @param url
* @param requiredSize
* @return
*/
private Bitmap getBitmap(String url, int requiredSize, PhotoToLoad photoToLoad) {
File f = fileCache.getFile(url);
// 先从文件缓存中查找是否有
Bitmap b = decodeFile(f, requiredSize);
if (b != null) return b;
// 最后从指定的url中下载图片
try {
Bitmap bitmap = null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is = conn.getInputStream();
OutputStream os = new FileOutputStream(f);
// CopyStream(is, os, conn.getContentLength(), photoToLoad);
photoToLoad.totalSize = conn.getContentLength();
int buffer_size = 1024;
byte[] bytes = new byte[buffer_size];
for (; ; ) {
int count = is.read(bytes, 0, buffer_size);
if (count == -1) {
break;
}
os.write(bytes, 0, count);
if (null != photoToLoad.onImageLoaderListener) { // 如果设置了图片加载监听，则回调
Message msg = rHandler.obtainMessage();
photoToLoad.currentSize += count;
msg.arg1 = IMAGE_LOADER_PROCESS;
msg.obj = photoToLoad;
rHandler.sendMessage(msg);
}
}
is.close();
os.close();
bitmap = decodeFile(f, requiredSize);
return bitmap;
} catch (Exception ex) {
Logger.w(TAG, ex);
return null;
}
}
@Override
public Object runInBackground() {
PhotoToLoad photoToLoad = (PhotoToLoad) objs[0];
int requiredSize = (Integer) objs[1];
if (imageViewReused(photoToLoad)) { // 防止图片错位（如果加载的图片不是当前需要加载的图片，则不做任何处理）
return null;
}
Bitmap bmp = getBitmap(photoToLoad.url, requiredSize, photoToLoad); // 网络加载图片
memoryCache.put(photoToLoad.url, bmp);
if (imageViewReused(photoToLoad)) { // 防止图片错位（如果加载的图片不是当前需要加载的图片，则不做任何处理）
return null;
}
// 加载结束，更新UI
Message msg = rHandler.obtainMessage();
msg.arg1 = IMAGE_LOADER_FINISHED;
photoToLoad.bitmap = bmp;
msg.obj = photoToLoad;
rHandler.sendMessage(msg);
return null;
}