No such file or Directory only in Android 6.0

Question

Below code is working fine on pre-Marshmallow devices but not in Marshmallow.

These are the permissions in Manifest

Answer 1

Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app.

This is why it works in pre-lolipop versions, and doesn't on API 23. Permissions in Android Manifest alone are not enough, you need to add them at runtime as well. Refer here for more details.