我正在寻找类似于SDWebImage的Android库。iOS中SDWebImage的功能包括:
从URL加载图片、使用缓存并进行异步下载。
我正在寻找类似于Android的库。有什么建议吗?
谢谢。
我在以下链接中得到了这个答案:ListView中的图片懒加载
package com.wilson.android.library;
/* 根据一个或多个贡献者许可协议,Apache软件基金会(ASF)授权使用此文件。有关版权所有权的其他信息,请参阅随此工作分发的NOTICE文件。ASF根据Apache许可证第2.0版(“许可证”)向您授予此文件的使用权;除非符合许可证,否则您不得使用此文件。您可以在以下位置获取许可证的副本:
http://www.apache.org/licenses/LICENSE-2.0
除非适用法律要求或书面同意,根据许可证分发的软件是基于“原样”分发的,没有任何明示或暗示的保证或条件。请参阅许可证以了解许可权限和限制的具体语言。
*/
import java.io.IOException;
public class DrawableManager {
private final Map<String, Drawable> drawableMap;
public DrawableManager() {
drawableMap = new HashMap<String, Drawable>();
}
public Drawable fetchDrawable(String urlString) {
if (drawableMap.containsKey(urlString)) {
return drawableMap.get(urlString);
}
Log.d(this.getClass().getSimpleName(), "image url:" + urlString);
try {
InputStream is = fetch(urlString);
Drawable drawable = Drawable.createFromStream(is, "src");
if (drawable != null) {
drawableMap.put(urlString, drawable);
Log.d(this.getClass().getSimpleName(), "got a thumbnail drawable: " + drawable.getBounds() + ", "
+ drawable.getIntrinsicHeight() + "," + drawable.getIntrinsicWidth() + ", "
+ drawable.getMinimumHeight() + "," + drawable.getMinimumWidth());
} else {
Log.w(this.getClass().getSimpleName(), "could not get thumbnail");
}
return drawable;
} catch (MalformedURLException e) {
Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e);
return null;
} catch (IOException e) {
Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e);
return null;
}
}
public void fetchDrawableOnThread(final String urlString, final ImageView imageView) {
if (drawableMap.containsKey(urlString)) {
imageView.setImageDrawable(drawableMap.get(urlString));
}
final Handler handler = new Handler() {
@Override
public void handleMessage(Message message) {
imageView.setImageDrawable((Drawable) message.obj);
}
};
Thread thread = new Thread() {
@Override
public void run() {
//TODO : set imageView to a "pending" image
Drawable drawable = fetchDrawable(urlString);
Message message = handler.obtainMessage(1, drawable);
handler.sendMessage(message);
}
};
thread.start();
}
private InputStream fetch(String urlString) throws MalformedURLException, IOException {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet request = new HttpGet(urlString);
HttpResponse response = httpClient.execute(request);
return response.getEntity().getContent();
}
}
希望能有所帮助。
https://github.com/thest1/LazyList
一个简单的Android图片显示库。 图像在后台异步下载。 图像被缓存在SD卡和内存中。 也可以用于GridView,只需将图像显示到ImageView中即可。