title: Android 4.4: is WRITE_EXTERNAL_STORAGE permission effective on primary external storage /mnt/sdcard?
body: <p>Android 4.4 new rules for accessing external storage seem to break many applications.</p>
  
  <p>According to this: <a href="http://source.android.com/devices/tech/storage/">http://source.android.com/devices/tech/storage/</a> (read carefully)
  it seems that WRITE_EXTERNAL_STORAGE permission no more grants access to secondary removable storage with /mnt/external_sd path in Android 4.4.
  They say that apps just can access a private folder on secondary removable storage, and it is removed when the app is removed.</p>
  
  <p>Now, I think that, according to what is implicit, WRITE_EXTERNAL_STORAGE will instead grant access on primary external storage /mnt/sdcard.</p>
  
  <p>If it is true, it is possible, for example, that my app starts another app and feeds it with a file:// url within the primary external storage and then the called app can edit and save the file to the same path, provided it has the WRITE_EXTERNAL_STORAGE permission.</p>
  
  <p>Does Android 4.4 work this way as to primary external storage access?</p>