Caching bitmap in android [duplicate]

Question

How can I cache images after they are downloaded from web?

Answer 1

And now the punchline: use the system cache.

URL url = new URL(strUrl);
URLConnection connection = url.openConnection();
connection.setUseCaches(true);
Object response = connection.getContent();
if (response instanceof Bitmap) {
  Bitmap bitmap = (Bitmap)response;
} 

Provides both memory and flash-rom cache, shared with the browser.

grr. I wish somebody had told ME that before i wrote my own cache manager.

Answer 2

Regarding the elegant connection.setUseCaches solution above: sadly, it won't work without some additional effort. You will need to install a ResponseCache using ResponseCache.setDefault. Otherwise, HttpURLConnection will silently ignore the setUseCaches(true) bit.

See the comments at the top of FileResponseCache.java for details:

http://libs-for-android.googlecode.com/svn/reference/com/google/android/filecache/FileResponseCache.html

(I'd post this in a comment, but I apparently don't have enough SO karma.)