title: where is the file when use getCacheDir
body: <p>As I debugged, I found that the GetCacheDir return <code>/data/data/yourapp/cache/</code></p>
  
  <p>But as I store files, I found nothing in that path(with shell),
  but in <code>/sdcard/Android/data/yourapp/cache/</code>  I found the cache file?
  who can tell me why?</p>