(A simple Android registration interface, which supports full screen display during registration, is implemented through the following two sentences: getWindow(). setFlags (WindowManager. LayoutParams. FLAG_FULLSCREEN, WindowManager. LayoutParams. FLAG_FULLSCREEN); Hiding some icons such as batteries in the status bar and all the retouching parts, requestWindowFeature (Window. FEATURE_NO_TITLE); Hide the title block program name and other information.)