Existing smartphones store multiple NFC card information. When the NFC antenna of the phone is close to the card reader, it is usually necessary to open the APP to select NFC card information or default to one card information to be transmitted to the card reader. It is not possible to quickly select or switch cards among multiple cards. For example, after using the NFC function to swipe the subway card, the phone needs to open the car access control and community access control again. It is necessary to open the mobile NFC card information management APP to select the community access control card and then swipe the mobile NFC access control, which causes inconvenience. (现有的智能手机存储多个 NFC 卡信息。当手机的NFC天线靠近读卡器时,通常需要打开APP选择NFC卡信息或默认一个卡信息传输到读卡器。无法在多张卡之间快速选择或切换卡。例如,使用NFC功能刷完地铁卡后,手机需要重新打开车内门禁和小区门禁。需要打开手机NFC卡信息管理APP选择社区门禁卡,然后刷手机NFC门禁,造成不便。) Divide the smartphone screen into multiple areas, and users can freely d