是否可以仅显示配对，打开和范围内的蓝牙设备的活动列表，而不是显示所有先前配对的设备？

Question

I am currently working on an android app that connects to an arduino microprocessor with Bluetooth SPP capabilities. My app shows all previously paired bluetooth devices, but I wanted to know is it possible to only show paired devices that are currently turned ON? I have searched for an answer everywhere and have yet to find one, hopefully this is possible.

Answer 1

You'll need to create a BluetoothAdapter, and register a BroadcastReceiver to BluetoothDevice.ACTION_FOUND. Store those found devices in some sort of list.

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
registerReceiver(receiver, intentFilter);
bluetoothAdapter.startDiscovery();

...
private ArrayList<BluetoothDevice> devices = new ArrayList<>();
private final BroadcastReceiver receiver = new BroadcastReceiver(){
    public void onReceive(Context context, Intent intent){
        String action = intent.getAction();
        if(action.equals(BluetoothAdapter.ACTION_FOUND)){
            BluetoothDevice bluetoothDevice = (BluetoothDevice) intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            devices.add(bluetoothDevice);
        }
    }
};

You can also register the receiver to BluetoothDevice.ACTION_DISCOVERY_STARTED and BluetoothDevice.ACTION_DISCOVERY_FINISHED and handle them accordingly.

Note: Don't forget to register the broadcast receiver in the manifest and include necessary permissions.