Film Viewer is a free Android app developed by Android App Smith. It is a simple and efficient tool designed to help users view films, including photo negatives and x-rays, on their mobile devices. The app works by setting the screen brightness to maximum when in use, allowing for better visibility of the film.

To use the app, simply drag your finger to the right to make the white space wider or to the left to make it skinnier. You can also drag your finger up to make the white space taller or downward to make it shorter. Once you have adjusted the white space to the size of your film, place your film on top of the screen. The app's design ensures that the white space is only as large as your film, making it easier to view.

It is important to note that the app requires the "Write Settings" permission to change the screen brightness to maximum while in use. However, this is a necessary permission for the app to function properly.

Overall, Film Viewer is a simple and useful app for anyone who needs to view films on their mobile device. Its intuitive design and straightforward functionality make it a great choice for those who need a quick and easy solution for viewing films on-the-go.