For following the Gestalt principles. I will try my best to make the interface as concise as possible, and make the buttons or interactive pages of the entire page as aesthetically pleasing as possible. I will also separate the primary and secondary information on the page so that users can grasp the important information at once.
For following the Fitts’s Law. I will put the most common buttons at the bottom, which makes users to touch them easier. I might also create a one-handed mode for this interface, because the screens of smart phones are getting bigger and bigger, and it is becoming more and more difficult for users to use with one hand. One-handed mode can make it more convenient for users to operate the app, thereby improving their favorability.