Cache the thumbnails In my app (Snap FX) I have two cache levels.
1. In-memory cache (hash-map) 2. Thumbnail record file, much like Thumbs.db on Windows. 1. When requesting a thumbnail of an image, read first from the in- memory cache. 2. If this fails, read from the thumbnail record file (and put into in- memory cache). 3. If that fails, read from thumbnail content-provider (and put into thumbnail record file and into in-memory cache). 4. If that fails, generate a thumbnail from the original image (and put it into the thumbnail content-provider, into the thumbnail record file and into in-memory cache). For fast access to the thumbnail record file, use RandomAccessFile as a file-based hash-map. On Feb 15, 11:33 pm, Pankaj <[email protected]> wrote: > Hi all, > I have several images present in different folders in my sdcard. I > would like to display a list of thumbnails. So what I have done is > while rendering any row in the list I read the file in an input > stream, get the byte array, decode it to obtain a bitmap and set it in > an imageview. > > So far so good. But when I scroll the list, the list scrolls in jerks. > I believe this is because decoding a bitmap from byte array takes some > time. What I would like to know is that, is there any optimization > which I can do to improve the performance, or better still is there > any better method to achieve what I want ? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
