使用小米MiBand和BLE测量心率

Question

我正在尝试实现与健身追踪器小米Mi Band一起使用的简单sdk。目前，我可以跟踪步骤，启动振动，处理传感器触摸，但我在心率测量方面有问题。我的sdk基于https://github.com/pangliang/miband-sdk-android.要测量心率，我需要将描述符写入适当的特征，以便在该特征的值发生变化时能够处理回调，然后将适当的数据写入心率控制点特征，以直接启动心率测量过程。问题是，在启动心率测量过程的数据被成功写入特征后，心率测量过程没有启动（当Mi Band开始测量心率时，底部传感器闪烁绿色）。这可能是由于健身追踪器的新固件（固件版本：4.15.12.10；心率版本：1.3.74.64）或我的代码中存在一些缺陷：

/-------- MiBandProfile --------/
public static final UUID UUID_SERVICE_HEARTRATE = UUID.fromString("0000180d-0000-1000-8000-00805f9b34fb");
public static final UUID UUID_NOTIFICATION_HEARTRATE = UUID.fromString("00002a37-0000-1000-8000-00805f9b34fb");
public static final UUID UUID_CHAR_HEARTRATE = UUID.fromString("00002a39-0000-1000-8000-00805f9b34fb");
public static final UUID UUID_DESCRIPTOR_UPDATE_NOTIFICATION = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
/-------- MiBandProtocol --------/
public static final byte[] START_HEART_RATE_SCAN = {21, 1, 1};
/-------- BleProvider --------/
public class BleProvider extends BluetoothGattCallback {
public interface NotifyListener {
     void onNotify(byte[] data);
}
private HashMap<UUID, NotifyListener> mNotifyListeners = new HashMap<UUID, NotifyListener>();
.
.
.
public void setNotifyListener(UUID serviceUUID, UUID charaUUID, NotifyListener listener) {
        //enable chara notofication
        if (this.mGatt == null || !this.mIsServicesDiscovered) {
            if (DBG) Log.d(Debug.TAG, "Device is not connected or services are not discovered");
            return;
        }
        BluetoothGattCharacteristic chara = this.mGatt.getService(serviceUUID).getCharacteristic(charaUUID);
        if (DBG) Log.d(Debug.TAG, "setCharacteristicNotification: " + this.mGatt.setCharacteristicNotification(chara, true));
        BluetoothGattDescriptor descriptor = chara.getDescriptor(MiBandProfile.UUID_DESCRIPTOR_UPDATE_NOTIFICATION);
        if (DBG) Log.d(Debug.TAG, "setValue: " + descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE));
        if (DBG) Log.d(Debug.TAG, "writeDescriptor: " + this.mGatt.writeDescriptor(descriptor));
        this.mNotifyListeners.put(charaUUID, listener);
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
        //this method must be called when the characteristic value was changed but nothing happened :(
        super.onCharacteristicChanged(gatt, characteristic);
        if (this.mNotifyListeners.containsKey(characteristic.getUuid())) {
            this.mNotifyListeners.get(characteristic.getUuid()).onNotify(characteristic.getValue());
        }
}
} //end BleProvider
.
.
.
setNotifyListener(MiBandProfile.UUID_SERVICE_HEARTRATE, MiBandProfile.UUID_NOTIFICATION_HEARTRATE, new BleProvider.NotifyListener(){...});
//waiting few seconds
writeCharacteristic(MiBandProfile.UUID_SERVICE_HEARTRATE, MiBandProfile.UUID_CHAR_HEARTRATE, MiBandProtocol.START_HEART_RATE_SCAN);

也许这个协议被否决了，有些人可以给我分享一个新的协议。我会很高兴的）谢谢。

Answer 1

我解决了这个问题！在调用setNotifyListener跟踪脉冲值的变化之前，必须将用户信息（年龄、体重）写入适当的特性，因为没有这个Mi-Band就无法开始测量。

Answer 2

我使用BLE A&D，我使用的格式为：

查找UUID

  @SuppressLint("NewApi")
private void displayGattServicesService(List<BluetoothGattService> gattServices) {
    //  salida.append("Buscando servicio");
    if (gattServices == null)
        return;
    for (BluetoothGattService gattService : gattServices) {
        String uuid = gattService.getUuid().toString();
        List<BluetoothGattCharacteristic> gattCharacteristics = gattService
                .getCharacteristics();
        if (uuid.equals("00001810-0000-1000-8000-00805f9b34fb")) {
            //  salida.append("Ecnontro");
            for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) {
                String uuid1 = gattCharacteristic.getUuid().toString();
                if (uuid1.equals("00002a35-0000-1000-8000-00805f9b34fb")) {
                    //     salida.append("Envio caracterisitca");
                    mensaje(getResources().getString(R.string.Espere_res));
                    mBluetoothLeService.setCharacteristicNotification(
                            gattCharacteristic, true);
                }
            }
        }
    }
}

设置UUID

BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
            // Show all the supported services and characteristics on the user interface.
            displayGattServicesService(mBluetoothLeService.getSupportedGattServices());

使用BleGatt示例https://github.com/googlesamples/android-BluetoothLeGatt