How to bypass the Firebase cache to refresh data (in Android app)?

Question

On an Android application which must works offline most of the time I need, when it\'s online, to do some synchronous operations for i.e. :

User myUser =  My         


        

Answer 1

A workaround I discovered is using Firebase's runTransaction() method. This appears to always retrieve data from the server.

String firebaseUrl = "/some/user/datapath/";
final Firebase firebaseClient = new Firebase(firebaseUrl);

    // Use runTransaction to bypass cached DataSnapshot
    firebaseClient.runTransaction(new Transaction.Handler() {
        @Override
        public Transaction.Result doTransaction(MutableData mutableData) {
            // Return passed in data
            return Transaction.success(mutableData);
        }

        @Override
        public void onComplete(FirebaseError firebaseError, boolean success, DataSnapshot dataSnapshot) {
            if (firebaseError != null || !success || dataSnapshot == null) {
              System.out.println("Failed to get DataSnapshot");
            } else {
              System.out.println("Successfully get DataSnapshot");
              //handle data here
            }
        }
    });