Android device Bluetooth connection scan gun how to get the scan content

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1. Bluetooth pairing

Open the system settings, Bluetooth paired scanning gun, the general scanning gun instructions are written, after the pairing is completed, it shows that it is connected

Configure permissions in 2.AndroidManifest

Configure the permissions required for a Bluetooth connection in

3. Get device information and determine whether it is connected or not

Here the device type returned by the Bluetooth device is BluetoothClass.Device.Major.PERIPHERAL

/ * whether the scanning gun is connected to * @ return * / public boolean hasScanGun () {if (mBluetoothAdapter = = null) {return false;} Set blueDevices = mBluetoothAdapter.getBondedDevices (); if (blueDevices = = null | | blueDevices.size () = KeyEvent.KEYCODE_A & & keyCode = KeyEvent.KEYCODE_0 & & keyCode