ExpandableListView getChildAt(id).findViewById() returns null

Question

I've seen all questions that already post here...

ExpandableListView getChildAt() return null

Android GridView getChildAt(0).findViewById() returns null

But my problem not solve so please help me.

I just want to show textview background color in GroupView that expand and change previous one.

View view = expListView.getChildAt(id);

Its give me view everytime

textView = (TextView) view.findViewById(R.id.tv_basket_name);

But findViewById() gives null sometimes

    View view = expListView.getChildAt(id);
    if (view != null) {
        textView = (TextView) view.findViewById(R.id.tv_basket_name);
        if (textView != null) //Sometime gives null
            textView.setBackgroundColor(ContextCompat.getColor(getContext(), R.color.gray));
    }