Micro Control

Micro Control is an application with which you can disable and enable the microphone.
The app has a widget that can be displayed on top of other apps.
You can use the widget to turn the microphone on and off, for example, while playing a game on your phone.
You can use this to lock the microphone to all apps and the whole android system.
Permission required to display the widget on top of other applications. ROOT is not required.