How to get out the stored data from Firebase? Help me please : I'm not getting the output from Firebase database. It's not returning anything. 

I also tried getting value through Querry but it returned databaseerror: cannot convert java.util.hashmap to String 

''''

    FirebaseDatabase database = FirebaseDatabase.getInstance();
    DatabaseReference myRef = database.getReference().child("Member").push();

    myRef.addValueEventListener(new ValueEventListener() {
          @Override
          public void onDataChange(DataSnapshot dataSnapshot) {

              for (DataSnapshot ds : dataSnapshot.getChildren()) {

                  String value = ds.getValue(String.class);
                  Log.d("Tag", "Value is" + value);
              }
          }
''''