CODEWITHSUNDEEP
androidbluetooth
devs
devs

Reputation: 41

Android BLE enable notification

I'm working on a project which includes the interaction with a BLE button like this: enter image description here

My problem is that I don't know how can I do to enable the notification once that user press ble button. In this moment this method onCharacteristicChanged never fires.

    @Override
    public void onServicesDiscovered(final BluetoothGatt gatt, final int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
        }
    }

    @Override
    public void onCharacteristicChanged(BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic) {
        //read the characteristic data
        byte[] data = characteristic.getValue();
        Intent intent = new Intent(getActivity(), MainActivity.class);
        Bundle bundle = new Bundle();
        bundle.putBoolean("ISFROMBLE", true);
        intent.putExtras(bundle);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }

Could you please help me? Thanks

Upvotes: 2

Views: 3757

Answers (2)

SoroushA
SoroushA

Reputation: 2121

You are skipping lots of steps in connecting to a BLE device properly.

See the Android Documentation

Assuming that you have set up your connection correctly and onServicesDiscovered is called, after discovering services you need to enable notification on the desired characteristic:

characteristic = gatt.getService(UUID.fromString(SERVICE_UUID)).getCharacteristic(UUID.fromString(CHARACTERISTIC_UUID)); //Find you characteristic
mGatt.setCharacteristicNotification(characteristic, true); //Tell you gatt client that you want to listen to that characteristic
List<BluetoothGattDescriptor> descriptors = characteristic.getDescriptors(); //find the descriptors on the characteristic
BluetoothGattDescriptor descriptor = descriptors.get(1); //get the right descriptor for setting notifications
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
mGatt.writeDescriptor(descriptor); //apply these changes to the ble chip to tell it we are ready for the data

and then onCharacteristicChanged is called whenever that characteristic changes.

Upvotes: 2

user5350286
user5350286

Reputation:

You might have got your beacon sdk or jar. Include that to your android project. now in your eclipse project - 

import org.altbeacon.beacon.BeaconManager;
import org.altbeacon.beacon.Identifier;
import org.altbeacon.beacon.RangeNotifier;
import org.altbeacon.beacon.Region;
import org.altbeacon.beacon.Beacon;
import org.altbeacon.beacon.BeaconConsumer;
import org.altbeacon.beacon.BeaconManager;
import org.altbeacon.beacon.BeaconParser;
import org.altbeacon.beacon.MonitorNotifier;
import org.altbeacon.beacon.RangeNotifier;
import org.altbeacon.beacon.Region;

public class MainActivity extends Activity implements BeaconConsumer,
RangeNotifier {
//Add all unimplemented methods
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    beaconManager = BeaconManager.getInstanceForApplication(this);
    beaconManager.bind(this);
 } 

@Override
        public void didRangeBeaconsInRegion(Collection<Beacon> beacons,
            final Region region) {
     Beacon beacon = (Beacon) iterator.next();

                        uuid = beacon.getId1().toUuidString();
                        major = beacon.getId2().toInt();
                         //get your id and match with your ble button. If it matches, then you can call your method or send a notification
}
}

Upvotes: 0

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