Video Ad Volume Control
The device volume, controlled through volume buttons or OS-level volume slider, determines the volume for device audio output. However, apps can independently adjust volume levels relative to the device volume to tailor the audio experience.
Set App Volume
Valid ad volume values range from 0.0 (silent) to 1.0 (current device volume).
By default, the app volume is set to 1 (the current device volume).
admob.setAppVolume(0.5)
Mute App Volume
admob.setAppMuted(true)