How to use

cancel

method

in

androidx.core.os.CancellationSignal

@Override
protected void doCancelIdentify() {
  try {
    if (mCancellationSignal != null) {
      mCancellationSignal.cancel();
    }
  } catch (Throwable e) {
    onCatchException(e);
  }
}

  @Override
  public void onCancel() {
    supportCancellationSignal.cancel();
  }
});

public void stopListening() {
  if (mCancellationSignal != null) {
    mSelfCancelled = true;
    mCancellationSignal.cancel();
    mCancellationSignal = null;
    mListening = false;
  }
}

void cancel() {
  cancellationSignal.cancel();
  this.canceled = true;
}

public void cancelAuthentication() {
  final CancellationSignal signal = cancellationSignal.getAndSet(null);
  if (signal != null) {
    try {
      signal.cancel();
    } catch (NullPointerException e) {
      // Occasionally the cancel call throws an NPE when trying to unparcelize something.
    }
  }
}

@Override
public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
  if (!restartPredicate.invoke(AuthenticationFailureReason.SENSOR_FAILED, restartCount++)) {
    cancellationSignal.cancel();
  }
  listener.onFailure(AuthenticationFailureReason.SENSOR_FAILED, false, helpString, TAG, helpMsgId);
}