Use Samsung custom API and high system authority to control the tablet computer. The application schools in Xue Hai all adopt the online teaching mode of 1:3. The so-called "1:3 mode" means that one-third of a class is interactive through a tablet computer, and two-thirds of the time is through paper textbooks. The "Zhitongyun" application on the tablet uses Samsung's customized API and high system privileges to control the tablet, realizing a closed mode similar to iOS.