Android: OpenCV: imwrite always returns false and fails to write

Question

This code used to work but on Android 4.2 and OpenCV 2.4.4 it fails, but I don\'t know why. Can anyone shed any light on it for me?

Thanks for any help.

Baz<

Answer 1

Take care with versions +4.4 (KitKat) because android.permission.WRITE_EXTERNAL_STORAGE doesn't allow to write on the external SD card:

The WRITE_EXTERNAL_STORAGE permission must only grant write access to the primary external storage on a device. Apps must not be allowed to write to secondary external storage devices, except in their package-specific directories as allowed by synthesized permissions. Restricting writes in this way ensures the system can clean up files when applications are uninstalled.

Take a look to: Writing to SD Card always failing