Retrieving data using Map from Firebase Database

Question

I am trying to retrieve data from firebase database in Map format but I am getting a null pointer exception.I have successfully inserted data using map into my firebase data

Answer 1

Change your code at the time of retrieval

Map<String, String> map  = (Map) dataSnapshot.getValue();

Instead of

Map map = (Map) dataSnapshot.getValue();

Edit: You can retrieve list of recording using below code

databaseReference1.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
            Map<String, String> map = (Map) postSnapshot.getValue();
            if (map != null) {
                String message = map.get("text");
                String userName = map.get("Username");
            }
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
    }
});