Merge branch '5555-Camera_not_working_on_some_device_issue' into 'master'

                if (MyDebug.LOG) {

                    Log.d(TAG, "closeCamera: about to pause preview: " + (System.currentTimeMillis() - debug_time));

                }

                pausePreview(false);

                pausePreview(true);

                // we set camera_controller to null before starting background thread, so that other callers won't try

                // to use it

                final CameraController camera_controller_local = camera_controller;