onReceive.java

@Override
public void onReceive(Context context, Intent intent) {
    FenceState fenceState = FenceState.extract(intent);
    String geoFenceKey = fenceState.getFenceKey();
    switch (fenceState.getCurrentState()) {
        case FenceState.TRUE:
          Timber.d("fence %s detected", geoFenceKey);
          break;
        case FenceState.FALSE:
          Timber.d("fence %s false", geoFenceKey);
          break;
        case FenceState.UNKNOWN:
          Timber.d("fence %s unknown", geoFenceKey);
          break;
    }
}