This separate widget is going away. Instead it is now integrated into A2DP Volume starting with version 126.96.36.199. Become a tester here https://play.google.com/apps/testing/a2dp.Vol and get that app now. See details of how to use the widget here: https://github.com/jroal/a2dpvolume/wiki/Widgets
This is a simple widget (not an app) to connect/disconnect from A2DP Bluetooth sinks. That is all it does.
Install from Play Store
Pair your Bluetooth devices using Android settings
Turn Bluetooth ON
Place an instance of this widget on your home screen (launcher dependent on how you do this)
Click it to connect a device, again to disconnect.
The widget will connect if the device is currently not connected, and disconnect if the device is currently connected.
Become a Beta tester here: https://play.google.com/apps/testing/a2dp.connect2
This app is a mess. I have numerous timing and cross thread problems and need a real developer to help me architect this correctly. I integrated this widget into A2DP Volume instead of having it be a separate executable.