This separate widget is going away. Instead it is now integrated into A2DP Volume starting with version 2.13.0.0. 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.
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Install from Play Store
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Pair your Bluetooth devices using Android settings
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Turn Bluetooth ON
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Place an instance of this widget on your home screen (launcher dependent on how you do this)
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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.