Java 类com.nostra13.universalimageloader.core.assist.DiscCacheUtil 实例源码

/**
 * Copy image file to temporary folder.
 * @param context Context
 * @param imageUrl Url of image to copy
 * @return Copied file 
 * @throws IOException Fail to copy image file.
 */
public static File copyFileToTempDir(Context context, String imageUrl) throws IOException {
    final ImageLoader imageLoader = ImageLoader.getInstance();
    final File cachedFile = DiscCacheUtil.findInCache(imageUrl, imageLoader.getDiscCache());
    final Uri cachedUri = Uri.fromFile(cachedFile);

    final String pathDirToMake = StorageUtils.getCacheDirectory(context).getPath() + "/temp";
    File dirToMake = new File(pathDirToMake); 
    if (!dirToMake.exists()) {
        dirToMake.mkdirs();
    } else if (!dirToMake.isDirectory()) {
        dirToMake.delete();
        dirToMake.mkdirs();
    }

    File fileToMake = new File(pathDirToMake + "/" + ((Long)(System.currentTimeMillis()/1000)).toString() + "." + getFileExtension(context, cachedUri));

    copyFile(cachedFile, fileToMake);

    return fileToMake;
}

private ImageView loadAvatar(final String channelJid, boolean skipCache) {
    ImageView avatarView = (ImageView) findViewById(R.id.bcProfilePic);
    DisplayImageOptions dio = new DisplayImageOptions.Builder()
            .cloneFrom(ImageHelper.defaultImageOptions())
            .showImageOnFail(R.drawable.ic_avatar)
            .showImageOnLoading(R.drawable.ic_avatar)
            .preProcessor(ImageHelper.createRoundProcessor(16, false, -1))
            .resetViewBeforeLoading(true)
            .build();

    String avatarURL = AvatarUtils.avatarURL(this, channelJid);
    if (skipCache) {
        DiscCacheUtil.removeFromCache(avatarURL, ImageLoader.getInstance()
                .getDiscCache());
        MemoryCacheUtil.removeFromCache(avatarURL, ImageLoader
                .getInstance().getMemoryCache());
    }

    ImageLoader.getInstance().displayImage(avatarURL, avatarView, dio);

    return avatarView;
}

@Override
    public void onLoadingStarted(String url, View view) {
        List<String> memCache = MemoryCacheUtil.
                findCacheKeysForImageUri(url, ImageLoader.getInstance().getMemoryCache());
        cacheFound = !memCache.isEmpty();
        if (!cacheFound) {
            File discCache = DiscCacheUtil.
                    findInCache(url, ImageLoader.getInstance().getDiscCache());
            if (discCache != null) {
                cacheFound = discCache.exists();
            }
        }
    }