Huawei Honor 9 User Manual page 36

Using knuckle gestures to record
To start a screen recording, knock the screen twice with two knuckles.
Audio will also be recorded, so make sure that you are in a quiet environment.
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Recording will stop automatically when you make or receive a call.
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When making a screen recording, you will not be able to use the recording feature in other
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applications.
Longer recordings will take up more space on your device's internal storage, so ensure
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there is enough space before recording.
You can stop a screen recording in three ways:
Knock the screen twice with two knuckles
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Screen and Display
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