Adding new feature in plugin

[dharmita1990]

I'm new in flutter and wanted to add some new feature in this plugin ,

1. Created a new eventchannel lib/flutter_bluetooth_serial.dart

static const EventChannel _discoveryChannel = const EventChannel('$namespace/discovery');

//Doubt : how to listen to List of bluetooth devices instead of single Map object
Stream<dynamic> onDiscovery() { return _discoveryChannel.receiveBroadcastStream().map((map) => BluetoothDevice.fromMap(map)); }

2. wrote new event channel in FlutterBluetoothSerialPlugin class

`
private final StreamHandler discoveryStreamHandler = new StreamHandler() {

    List<Map<String, Object>> list = new ArrayList<>();

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d("discoveryStreamHandler ","onReceive");
            final String action = intent.getAction();

            Log.d(TAG, action);

            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                  // Get the BluetoothDevice object from the Intent
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    // Add the name and address to an array adapter to show in a ListView

    Map<String, Object> ret = new HashMap<>();
    ret.put("address", device.getAddress());
    ret.put("name", device.getName());
    ret.put("type", device.getType());
    list.add(ret);


    // Log.d("list",list.toString());
    discoverySink.success(ret);
            }else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){

/* want to return list here while listening to it getting error as "List not a subtype of map<dynamic,dynamic>
*/
// discoverySink.success(list);
}
}
};

    @Override
    public void onListen(Object o, EventSink eventSink) {
        discoverySink = eventSink;

          if (ContextCompat.checkSelfPermission(registrar.activity(),
                        Manifest.permission.ACCESS_COARSE_LOCATION)
                        != PackageManager.PERMISSION_GRANTED) {

                    ActivityCompat.requestPermissions(registrar.activity(),
                            new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
                            REQUEST_COARSE_LOCATION_PERMISSIONS);

//Doubt : what shall i return here?

                }
        Log.e("discoveryStreamHandler ","onListen"+ registrar.activeContext());
        registrar.activeContext().registerReceiver(mReceiver,
        new IntentFilter(BluetoothDevice.ACTION_FOUND));
        registrar.activeContext().registerReceiver(mReceiver,
                new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED));
                mBluetoothAdapter.startDiscovery();

     

       
    }

    @Override
    public void onCancel(Object o) {
        Log.d("discoveryStreamHandler", "onCancel");
        discoverySink = null;
        registrar.activity().unregisterReceiver(mReceiver);
    }
};`

Called from main.dart as
bluettoth.getdevices().listen.
I'm getting list of devices but have some doubt which i listed in code snippet. Please revert

[edufolly]

Hi, @dharmita1990

create a fork from this repository and make your own changes. After your tests, you can provide a pull request to improve this plugin.