Androidnavigationpopback cannot return to the previous one.

Program error. In the computer program, navigation can't return to the previous command because of a program error, and the onCreateView program needs to be re-executed. Computer programs are also called "computer software". A logical method that enables a computer to accurately describe the required functions through instruction sequences. The computer itself can be patented as a machine, but the computer program is a method of mathematical logic, which is not protected by all countries.