question: public void clear ( ) { if ( USE_MEMORY_CACHE ) { synchronized ( mMemoryCache ) { mMemoryCache . evictAll ( ) ; } } synchronized ( mEntries ) { mEntries . clear ( ) ; } File [ ] cacheFiles = mCacheDir . listFiles ( ) ; for ( File file : cacheFiles ) { if ( ! file . delete ( ) ) { Log . e ( TAG , "Cannot delete " + file . getPath ( ) ) ; } } }
target:  Clears the cache (both memory and disk)