How to use

setOnCancelListener

method

in

androidx.core.os.CancellationSignal

@SuppressLint("Assert")
private void detachCancellationSignal(CancellationSignal cancellationSignal) {
  if (cancellationSignal != null) {
    assert mCancellationSignalAttachCount > 0;
    mCancellationSignalAttachCount -= 1;
    if (mCancellationSignalAttachCount == 0) {
      // After this point, onCancel() cannot be called concurrently.
      cancellationSignal.setOnCancelListener(null);
      // Reset cancellation flag after executing the statement.
      nativeResetCancel(mConnectionPtr, false /*cancelable*/);
    }
  }
}

private void attachCancellationSignal(CancellationSignal cancellationSignal) {
  if (cancellationSignal != null) {
    cancellationSignal.throwIfCanceled();
    mCancellationSignalAttachCount += 1;
    if (mCancellationSignalAttachCount == 1) {
      // Reset cancellation flag before executing the statement.
      nativeResetCancel(mConnectionPtr, true /*cancelable*/);
      // After this point, onCancel() may be called concurrently.
      cancellationSignal.setOnCancelListener(this);
    }
  }
}

cancellationSignal.setOnCancelListener(new CancellationSignal.OnCancelListener() {
  @Override
  public void onCancel() {
  cancellationSignal.setOnCancelListener(null);

cancellationSignal.setOnCancelListener(new CancellationSignal.OnCancelListener() {
  @Override
  public void onCancel() {