title: Is cache folder in android (getCacheDir()) functionally equivalent to cache folder in iOS (NSCachesDirectory)?
body: <p>I have some downloadable content (e.g.:game character image) in a app, in iOS they are saved to path NSCachesDirectory, which I follows the guidelines of iOS that downloadable content should be saved in NSCachesDirectory, which is a cache directory. I am struggling if I should save the files to getCacheDir() in android side.</p>
  
  <p>At first I think the cache folder in iOS should be equivalent (or similar) to the one in android, but after looking at some doc I doubt if they are functionally identical:</p>
  
  <p>1.iOS suggest some downloadable content to save in cache folder, such content is more persist temporary file in tmp. But in android, the doc says getCacheDir() should store cache files rather than persist files, it makes me suspect android cache folder works more like the tmp folder in iOS</p>
  
  <p>2.I cannot find any size limit guideline on iOS cache file, but android side says it should have reasonable size limit, say 1 MB (and I think my content would be far more than 1 MB, say 50 to 100 MB).</p>
  
  <p>So my question is, are iOS cache folder works functionally equivalent to cache folder in android? Is it correct to use getCacheDir() at android side  at the place that I use NSCachesDirectory in iOS side? if not,which path should I use at android side when I use NSCachesDirectory at iOS side?</p>