title: Android SetNestedScrollingEnabled not called?
body: <p>I have a nested child scrollview that is set to disable scrolling until the parent scrollview completes scrolling up.  Setting the <code>childScrollView.setNestedScrollingEnabled(false)</code> works initially, and is reenabled <code>childScrollView.setNestedScrollingEnabled(true)</code> after the parent is scrolled up completely.  However, while this is working, I want to again disable the nested scrollview after the parent is scrolled to the bottom, but it's not working.  Any ideas?</p>
  
  <p><strong>MainActivity (snippet) :</strong></p>
  
  <pre><code>ResponsiveScrollView parentScroll = (ResponsiveScrollView) findViewById(R.id.parentScroll);
  
  final ScrollView childScroll = (ScrollView) findViewById(R.id.childScroll);
  
  childScroll.setNestedScrollingEnabled(false); // disabled by default
  
  parentScroll.setOnEndScrollListener(new PriorityNestedScrollView.OnEndScrollListener() {
  
      @Override
      public void onUpEndScroll() {
          Log.i(TAG, "scrolling up has ended"); // successfully fires
  
          childScroll.setNestedScrollingEnabled(true); // working...
      }
  
      @Override
      public void onDownEndScroll() {
          Log.i(TAG, "scrolling down has ended"); // successfully fires
  
          childScroll.setNestedScrollingEnabled(false); // not working...
      }
  });
  </code></pre>
  
  <p><strong>ResponsiveScrollView (snippet) :</strong></p>
  
  <pre><code>@Override
  protected void onScrollChanged(int x, int y, int oldX, int oldY) {
      super.onScrollChanged(x, y, oldX, oldY);
  
      // scroll up ended
      if (y &gt;= END) {
          if (onEndScrollListener != null) {
              onEndScrollListener.onUpEndScroll();
          }
      }
  
      // scroll down ended
      if (y &lt;= START) {
          if (onEndScrollListener != null) {
              onEndScrollListener.onDownEndScroll();
          }
      }
  }
  </code></pre>