Firebase setValue() method is not triggered sometimes while using diskpersistence

Question

虽然在android中启用了启用磁盘持久性的firebase，但我观察到有时使用setValue（）方法添加的数据没有反映在数据库中。代码只是简单的firebaseRef.child（“xyz”）。setValue（userObj）。任何想法？

Answer 1

Your updated question from the comments is:

how can I know if the value has been written to the database for sure?

For this you add a completion listener to the setValue() call. From the documentation on completion listeners :

ref.setValue("I'm writing data", new Firebase.CompletionListener() {
  @Override
  public void onComplete(FirebaseError firebaseError, Firebase firebase) {
    if (firebaseError != null) {
      System.out.println("Data could not be saved. " + firebaseError.getMessage());
    } else {
      System.out.println("Data saved successfully.");
    }
  }
});