在textView中设置整数值显示为null，如何在android中解决此问题？

Question

I fetched a value from database and stored in a variable. I exactly got the expected value. But when I try to set those value into a textview it shows null or 0. Why this happening? How to solve this?

I used,

 claimedNos = dataSnapshot.child("Claimed").getValue(int.class);

this code for getting data from database.

 valueClaimed.setText(String.valueOf(claimedNos));

this for setting value to textview.

code is here,

public int claimedNos;

      uDatabase.child(userId).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

           claimedNos = dataSnapshot.child("Claimed").getValue(Integer.class);
            Log.d("TAG","claimed nos in account  :"+claimedNos);
        }

Answer 1

As your code posted and comments makes me assuming that you are not setting text into TextView inside listener. So I suggest you to put

valueClaimed.setText(String.valueOf(claimedNos));

inside onDataChange method like this

 public int claimedNos=0;

    uDatabase.child(userId).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

           claimedNos = dataSnapshot.child("Claimed").getValue(Integer.class);
            Log.d("TAG","claimed nos in account  :"+claimedNos);
           valueClaimed.setText(String.valueOf(claimedNos));
        }

Your code is setting value before listner listen dataChange event and it was making null and zero so now above code will set claimedNos after receiving it from firebase,