Class BluetoothSensor

android/src/BluetoothSensor.java:43–293

Read Bluetooth LE sensor values and report them to a #SensorListener.

 * #SensorListener.
 */
public final class BluetoothSensor
  extends BluetoothGattCallback
  implements AndroidSensor
{
  private final SensorListener listener;
  private final SafeDestruct safeDestruct = new SafeDestruct();

  private final BluetoothGatt gatt;

  private int state = STATE_LIMBO;

  private BluetoothGattCharacteristic currentEnableNotification;
  private final Queue<BluetoothGattCharacteristic> enableNotificationQueue =
    new LinkedList<BluetoothGattCharacteristic>();

  private boolean haveFlytecMovement = false;
  private double flytecGroundSpeed, flytecTrack;
  private int flytecSatellites = 0;

  public BluetoothSensor(Context context, BluetoothDevice device,
                         SensorListener listener)
    throws IOException
  {
    this.listener = listener;

    if (Build.VERSION.SDK_INT >= 23)
      gatt = device.connectGatt(context, true, this, BluetoothDevice.TRANSPORT_LE);
    else
      gatt = device.connectGatt(context, true, this);

    if (gatt == null)
      throw new IOException("Bluetooth GATT connect failed");
  }

  @Override
  public void close() {
    safeDestruct.beginShutdown();
    gatt.close();
    safeDestruct.finishShutdown();
  }

  @Override
  public int getState() {
    return state;
  }

  private void setStateSafe(int _state) {
    if (_state == state)
      return;

    state = _state;

    if (safeDestruct.increment()) {
      try {
        listener.onSensorStateChanged();
      } finally {
        safeDestruct.decrement();
      }