Open Image Dialog/gridview Is Very Slow

What I have I have an 'open image dialog' in an activity. This 'dialog' only shows folders and compatible images. For this I have a layer with a gridview that I fill with rows that

Solution 1:

In somewhere, the code calls this (data is the full pathname of the image):

DiskLruCache.Editoreditor= mHttpDiskCache.edit(key);
if (editor != null) {
       if (downloadUrlToStream(data,editor.newOutputStream(DISK_CACHE_INDEX))) {
             editor.commit();
       } else {
             editor.abort();
       }
}

because I don't know how to change it, I modified the url receptor so now instead of reading from the net it reads from a file:

publicbooleandownloadUrlToStream(String urlString, OutputStream outputStream) {
        disableConnectionReuseIfNecessary();
        HttpURLConnectionurlConnection=null;
        BufferedOutputStreamout=null;
        BufferedInputStreamin=null;

        try {

            in = newBufferedInputStream(newFileInputStream(newFile(urlString)), IO_BUFFER_SIZE);
            out = newBufferedOutputStream(outputStream, IO_BUFFER_SIZE);

            int b;
            while ((b = in.read()) != -1) {
                out.write(b);
            }
            returntrue;
        } catch (final IOException e) {
            Log.e(TAG, "Error in downloadBitmap - " + e);
        } finally {
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (final IOException e) {}
        }
        returnfalse;
    }

But the gridview load the images very slowly. I think it's because the last method. How can I do it better?

Solution 2:

Finally I did all that the Android page said without doing anything for the cache. Now the list loads fast. Maybe I could add a memory cache as Wenhui pointed but it is so fast that it doesn't matter for my purposes.

The test has been done on a SII with a folder containing around 400 with 8Mpx