/**
* 添加 数据到sdcard缓存中
*
* @param url url地址
* @param data 数据信息
*/
public void addToDiskCache(String url, byte[] data) {
if (mDiskCache == null || url == null || data == null) {
return;
}
// Add to disk cache
byte[] key = Utils.makeKey(url);
long cacheKey = Utils.crc64Long(key);
ByteBuffer buffer = ByteBuffer.allocate(key.length + data.length);
buffer.put(key);
buffer.put(data);
synchronized (mDiskCache) {
try {
mDiskCache.insert(cacheKey, buffer.array());
} catch (IOException ex) {
// ignore.
}
}
}
/**
* 从sdcard中获取内存缓存
*
* @param url 图片url地址
* @param buffer 填充缓存区
* @return 是否获得图片
*/
public boolean getImageData(String url, BytesBuffer buffer) {
if (mDiskCache == null) return false;
byte[] key = Utils.makeKey(url);
long cacheKey = Utils.crc64Long(key);
try {
LookupRequest request = new LookupRequest();
request.key = cacheKey;
request.buffer = buffer.data;
synchronized (mDiskCache) {
if (!mDiskCache.lookup(request)) return false;
}
if (Utils.isSameKey(key, request.buffer)) {
buffer.data = request.buffer;
buffer.offset = key.length;
buffer.length = request.length - buffer.offset;
return true;
}
} catch (IOException ex) {
// ignore.
}
return false;
}
/**
* Closes the disk cache associated with this ImageCache object. Note that this includes disk
* access so this should not be executed on the main/UI thread.
*/
public void close() {
if (mDiskCache != null) mDiskCache.close();
}
public void clearDiskCache() {
if (mDiskCache != null) mDiskCache.delete();
}