Abstract: Various embodiments provide a method performed by a handheld device and the handheld device, where a USB interface of the handheld device with an infrared remote control application is connected to a port of a display device by using an adapter cable, the handheld device determines that a preset source port of the display device is not the connected port, and automatically switches the source port to the connected port by using the infrared remote control application. The handheld device sends to-be-displayed content of the handheld device to the display device by using the USB interface, the adapter cable, and the connected port to enable the display device to display the to-be-displayed content.

Abstract: Example charging methods are described. One example method includes determining that a second electronic device is wirelessly connected with a first electronic device. The first electronic device is charged using the second electronic device, in a wireless charging receiving mode of the first electronic device, when the second electronic device is a wireless charging cradle device. Charging current is provided to the second electronic device, in a wireless charging cradle mode of the first electronic device, when the second electronic device is a wireless charging receiving device. The first electronic device can be used both as a wireless charging receiving device to receive electric energy provided by a wireless charging cradle device, and as a wireless charging cradle device to provide charging current to a second electronic device.

Abstract: An electronic device includes a key circuit, a first universal serial bus (USB) circuit coupled to the key circuit, where the key circuit outputs different signals when different keys on the key circuit are pressed. The first USB circuit is configured for USB communication, and a first power delivery (PD) circuit is coupled to the key circuit and configured to convert a signal output by the key circuit into a PD signal and transmit the PD signal to a second electronic device to enable the second electronic device to process the key operation when the first USB circuit is in a power-off state and a key operation is performed on the key circuit.

Abstract: A method (S300) performed by a handheld device (10) and the handheld device (10), where a USB interface of the handheld device (10) with an infrared remote control application is connected to a port (1233) of a display device (20) by using an adapter cable (105) (303), the handheld device (10) determines that a preset source port of the display device (20) is not the connected port (1233), and automatically switches the source port to the connected port (1233,305) by using the infrared remote control application. The handheld device (10) sends to-be-displayed content of the handheld device (10) to the display device (20) by using the USB interface, the adapter cable (105), and the connected port (1233), so that the display device (20) displays the to-be-displayed content (307). The method may provide convenience for a user, and greatly shorten a duration for displaying the to-be-displayed content of handheld device (10) on a screen of the display device (20).

Abstract: An electronic device includes a key circuit, a first universal serial bus (USB) circuit coupled to the key circuit, where the key circuit outputs different signals when different keys on the key circuit are pressed. The first USB circuit is configured for USB communication, and a first power delivery (PD) circuit is coupled to the key circuit and configured to convert a signal output by the key circuit into a PD signal and transmit the PD signal to a second electronic device to enable the second electronic device to process the key operation when the first USB circuit is in a power-off state and a key operation is performed on the key circuit.

Abstract: Example charging methods are described. One example method includes determining that a second electronic device is wirelessly connected with a first electronic device. The first electronic device is charged using the second electronic device, in a wireless charging receiving mode of the first electronic device, when the second electronic device is a wireless charging cradle device. Charging current is provided to the second electronic device, in a wireless charging cradle mode of the first electronic device, when the second electronic device is a wireless charging receiving device. The first electronic device can be used both as a wireless charging receiving device to receive electric energy provided by a wireless charging cradle device, and as a wireless charging cradle device to provide charging current to a second electronic device.

Abstract: A method for implementing a card-free mobile phone and a mobile phone are provided. The method includes acquiring selectable mobile numbers from a server, receiving a mobile number selected by a user from the selectable mobile numbers, and sending the mobile number to the server to execute mobile number registration. The method also includes receiving a mobile number registration acknowledgment message returned by the server. A manner of acquiring a mobile number is implemented in a manner of registering the mobile number on a server, and neither of a mobile phone card and burning of the mobile number is required.