title: Make a textview appear below parent-child (ExpandbleListView)
body: <p>I was wondering is it possible to make when creating a <code>ExpandableViewList</code> a text appear below. To be more specific I want to either click on the parent or the child and at the first case instead of the child, make a textview appear below, not clicable or anything. At the second case when clicking on the child pretty much the same to happen again.</p>
  
  <p>Here is a pic of what I mean to be more clear:</p>
  
  <p><a href="https://i.stack.imgur.com/FFZC6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FFZC6.png" alt=""></a></p>
  
  <p>So in this pic I want when clicking 'FAQ' make textview appear or when clicking any child like 'volvo' e.t.c</p>
  
  <p>For the child I tried something like this, but it gives me <code>nullPointerException</code>, but if delete the textview and leave only toast it works</p>
  
  <pre><code>expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
  
          @Override
          public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
              TextView tv= (TextView) v.findViewById(R.id.item);
              tv.setText("Welcome");
  
              return true;
              //Toast.makeText(getApplicationContext(), "child clicked", Toast.LENGTH_SHORT).show();
          }
      });
  </code></pre>