About a permission "WRITE_EXTERNAL_STORAGE"

http://developer.android.com/reference/android/Manifest.permission.html#WRITE_EXTERNAL_STORAGE

Starting in API level 19, this permission is not required to read/write files in your application-specific directories returned by getExternalFilesDir(String) and getExternalCacheDir()

If appliction is waking up on Android 4.4 Device, WRITE_EXTERNAL_STORAGE is not required to call getExternalFilesDir(String) and getExternalCacheDir(). Not returned Null.