/**
* Initializes the disk cache. Note that this includes disk access so this should not be executed
* on the main/UI thread. By default an ImageProvider 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() {
if (DEBUG) {
Log.d(TAG, "initDiskCache " + this);
}
// Set up disk cache
synchronized (mDiskCacheLock) {
if (mDiskLruCache == null || mDiskLruCache.isClosed()) {
if (mDiskCacheDir != null) {
if (!mDiskCacheDir.exists()) {
mDiskCacheDir.mkdirs();
}
if (FileUtil.getUsableSpace(mDiskCacheDir) > mDiskCacheSize) {
try {
mDiskLruCache = DiskLruCache.open(mDiskCacheDir, 1, 1, mDiskCacheSize);
if (DEBUG) {
Log.d(TAG, "Disk cache initialized " + this);
}
} catch (final IOException e) {
Log.e(TAG, "initDiskCache - " + e);
}
} else {
Log.e(
TAG,
String.format(
"no enough space for initDiskCache %s %s",
FileUtil.getUsableSpace(mDiskCacheDir), mDiskCacheSize));
}
}
}
mDiskCacheStarting = false;
mDiskCacheReady = true;
mDiskCacheLock.notifyAll();
}
}
/**
* Closes the disk cache associated with this ImageProvider object. Note that this includes disk
* access so this should not be executed on the main/UI thread.
*/
public void closeDiskCache() {
synchronized (mDiskCacheLock) {
if (mDiskLruCache != null) {
try {
if (!mDiskLruCache.isClosed()) {
mDiskLruCache.close();
mDiskLruCache = null;
if (DEBUG) {
Log.d(TAG, "Disk cache closed");
}
}
} catch (IOException e) {
Log.e(TAG, "close - " + e);
}
}
}
}
/**
* Clears both the memory and disk cache associated with this ImageProvider object. Note that this
* includes disk access so this should not be executed on the main/UI thread.
*/
public void clearCache() {
synchronized (mDiskCacheLock) {
mDiskCacheStarting = true;
mDiskCacheReady = false;
if (mDiskLruCache != null && !mDiskLruCache.isClosed()) {
try {
mDiskLruCache.delete();
if (DEBUG) {
Log.d(TAG, "Disk cache cleared");
}
} catch (IOException e) {
e.printStackTrace();
Log.e(TAG, "clearCache - " + e);
}
mDiskLruCache = null;
initDiskCache();
}
}
}