How to detect Bluetooth state change using a broadcast receiver?

Question

I am trying to make an app that shows a toast when the device\'s Bluetooth turned on. I wanna do that even when my app is not running. So I should use a broadcast receiver,

Answer 1

Unfortunately, for apps targeting api 26 or higher, manifest declared broadcast receivers don't work anymore (reference here: https://developer.android.com/guide/components/broadcast-exceptions), with some exceptions. android.bluetooth.adapter.action.STATE_CHANGED is not in that list.

For bluetooth, you can only listen for changes on:

ACTION_CONNECTION_STATE_CHANGED, ACTION_ACL_CONNECTED, ACTION_ACL_DISCONNECTED