The present disclosure relates to a method and a device for controlling an Application (APP) and a computer-readable storage medium. The method includes: when a working state of an image acquisition device of a terminal device is in a low-power-consumption mode and a graphic identification code discovery signal sent by the image acquisition device is received, the working state of the image acquisition device is controlled to be switched to a normal working mode; a content corresponding to a graphic identification code is recognized according to an image including the graphic identification code, which is acquired by the image acquisition device; and a preset operation corresponding to the content is triggered. In such a manner, an operating process of scanning the graphic identification code is simplified, and intelligence of the terminal device is improved. Moreover, the terminal device, when receiving the graphic identification code discovery signal sent by the image acquisition device in the low-power-consumption mode, controls the working state of the image acquisition device to be switched to the normal working mode, so that power consumed by the terminal device may be saved.