METHOD AND APPARATUS FOR ESTABLISHING SINGLE-LINE CONNECTION, AND WIRELESS HEADSET AND CHARGING BOX

Provided is a method for establishing a single-line connection. A wireless earphone determines whether a power supply contact of a charging box is in a communication mode, where a charging contact of the wireless earphone is connected to the power supply contact of the charging box. The wireless earphone switches the charging contact from a charging mode to a communication mode to establish a single-line connection with the charging box when determining that the power supply contact of the charging box is in the communication mode.