For those who are using the speaker-phone with your Android smart-phones all day long, very often you need to toggle your speaker-phone to mute and then un-mute many times per day. This app provides a simple way to do the toggling. It ride upon the power button on your smart-phone. That is, the button you press to wake up your smart-phone from sleep to do something will be used as also the trigger to mute and un-mute the speaker-phone. First time press power it mute, second time press power it un-mute and pattern repeat.
To configure, long tap on Home screen -> Widgets -> Mute Speakerphone On. Tap On (turn on the trigger) or Off (turn off the trigger).