Abstract: A communication protocol switching method includes that a first device communicates with a second device using a first protocol to project a screen of the first device to the second device; and when a first application in the first device is opened or a media file stored in the first device is opened, the first device switches to a second protocol to communicate with the second device and to project a display user interface of the first application or the media file to the second device, where the first application manages or plays at least one media file.

Abstract: A communication protocol switching method includes that a first device communicates with a second device using a first protocol to project a screen of the first device to the second device; and when a first application in the first device is opened or a media file stored in the first device is opened, the first device switches to a second protocol to communicate with the second device and to project a display user interface of the first application or the media file to the second device, where the first application manages or plays at least one media file.

Abstract: A video playing method includes receiving first data sent by a first source device and second data sent by a second source device, where the first data comprises first display data and first audio data, and where the second data comprises second display data and second audio data; displaying the first display data in a first screen subarea of the destination device and the second display data in a second screen subarea of the destination device; and playing the first audio data by using a first speaker device and the second audio data by using a second speaker device, where the first speaker device is an external speaker wirelessly connected with the destination device, and where the second speaker device is a built-in audio module of the destination device.

Abstract: A video playing method includes receiving first data sent by a first source device and second data sent by a second source device, where the first data comprises first display data and first audio data, and where the second data comprises second display data and second audio data; displaying the first display data in a first screen subarea of the destination device and the second display data in a second screen subarea of the destination device; and playing the first audio data by using a first speaker device and the second audio data by using a second speaker device, where the first speaker device is an external speaker wirelessly connected with the destination device, and where the second speaker device is a built-in audio module of the destination device.

Abstract: Embodiments of this application provide a projection display method and an electronic device, and relate to the field of terminal technologies, to dynamically adjust, based on a quantity of source devices, a parameter of display data projected onto a destination device, so as to improve display smoothness and use experience of a user during projection. The method includes: A source device sends a projection instruction to a destination device, where the projection instruction is used to instruct to project a display interface of the source device onto the destination device for display. The source device receives a first broadcast sent by the destination device, where the first broadcast includes a quantity N of source devices that need to perform projection onto the destination device for display.

Abstract: A communication protocol switching method includes that a first device communicates with a second device using a first protocol to project a screen of the first device to the second device; and when a first application in the first device is opened or a media file stored in the first device is opened, the first device switches to a second protocol to communicate with the second device and to project a display user interface of the first application or the media file to the second device, where the first application manages or plays at least one media file.

Abstract: The application relates to processes for the preparation of 1-[(3R,4S)-4-cyanotetrahydropyran-3-yl]-3-[(2-fluoro-6-methoxy-4-pyridyl) amino]pyrazole-4-carboxamide (I) which include (i) a synthesis for bromo and iodo pyridine intermediates, (ii) a synthesis of a pyrazole ester intermediate which can be obtained in enantiopure form and (iii) the combination of these intermediates into compound (I).