/**
* Initializes the disk cache. Note that this includes disk access so this should not be executed
* on the main/UI thread. By default an ImageCache does not initialize the disk cache when it is
* created, instead you should call initDiskCache() to initialize it on a background thread.
*/
public void initDiskCache() {
// Set up disk cache
synchronized (mDiskCacheLock) {
if (mDiskLruCache == null || mDiskLruCache.isClosed()) {
File diskCacheDir = mCacheParams.diskCacheDir;
if (mCacheParams.diskCacheEnabled && diskCacheDir != null) {
if (!diskCacheDir.exists()) {
diskCacheDir.mkdirs();
}
if (getUsableSpace(diskCacheDir) > mCacheParams.diskCacheSize) {
try {
mDiskLruCache = DiskLruCache.open(diskCacheDir, 1, 1, mCacheParams.diskCacheSize);
if (BuildConfig.DEBUG) {
Log.d(TAG, "Disk cache initialized");
}
} catch (final IOException e) {
mCacheParams.diskCacheDir = null;
Log.e(TAG, "initDiskCache - " + e);
}
}
}
}
mDiskCacheStarting = false;
mDiskCacheLock.notifyAll();
}
}
/**
* Initializes the disk cache. Note that this includes disk access so this should not be executed
* on the main/UI thread. By default an ImageCache does not initialize the disk cache when it is
* created, instead you should call initDiskCache() on a background thread
*/
public void initDiskCache() {
synchronized (mDiskCacheLock) {
if (mDiskLruCache == null || mDiskLruCache.isClosed()) {
File diskCacheDir = mCacheParams.diskCacheDir;
if (mCacheParams.diskCacheEnabled && diskCacheDir != null) {
if (!diskCacheDir.exists()) {
diskCacheDir.mkdirs();
}
if (getUsableSpace(diskCacheDir) > mCacheParams.diskCacheSize) { // 缓存路径可用空间大于默认值
try {
mDiskLruCache = DiskLruCache.open(diskCacheDir, 1, 1, mCacheParams.diskCacheSize);
if (BuildConfig.DEBUG) {
Log.d(TAG, "Disk cache initialized successfully");
}
} catch (IOException e) {
// TODO Auto-generated catch block
mCacheParams.diskCacheDir = null;
Log.e(TAG, "initDiskCache-" + e);
}
}
}
}
// 改变mDiskStarting唤醒getBitmapFromDiskCache
mDiskCacheStarting = false;
mDiskCacheLock.notifyAll();
}
}
/**
* Initialize the cache, providing all parameters.
*
* @param context The context to use
* @param cacheParams The cache parameters to initialize the cache
*/
private void init(Context context, ImageCacheParams cacheParams) {
mImageCacheParams = cacheParams;
// get a cache floder
final File diskCacheDir =
DiskLruCache.getDiskCacheDir(context, cacheParams.cachePath, cacheParams.uniqueName);
// Set up disk cache
if (cacheParams.diskCacheEnabled) {
mDiskCache = DiskLruCache.openCache(context, diskCacheDir, cacheParams.diskCacheSize);
if (null != mDiskCache) {
mDiskCache.setCompressParams(cacheParams.compressFormat, cacheParams.compressQuality);
if (cacheParams.clearDiskCacheOnStart) {
mDiskCache.clearCache();
}
} else {
Log.e(TAG, "Can't create DiskCache");
cacheParams.diskCacheEnabled = false;
}
}
// Set up memory cache
if (cacheParams.memoryCacheEnabled) {
mMemoryCache =
new LruCache<String, Bitmap>(cacheParams.memCacheSize) {
/**
* Measure item size in bytes rather than units which is more practical for a bitmap
* cache
*/
@Override
protected int sizeOf(String key, Bitmap bitmap) {
return BitmapUtil.getBitmapSize(bitmap);
}
};
}
}
