I see, but it doesn't mean much to me to look at the Bluetooth connection status alone. I mainly hope there will be a reminder when Bluetooth is disconnected, but it doesn't seem practical for such applications.It woulb be possible with alarm API, but well test Bluetooth status , that will reduce battery a lot, also will be bad, the thing of go to a page to test bluetooth status, and then go back, but well, you can use my simple program of Bluetooth