title: How to detect if TextView contains SpannableStringBuilder
body: <p>How can one find out if <code>TextView</code> contains <code>SpannableStringBuilder</code> and not plain text?
  I need to change text size of <code>TextView</code>, but it is different if it contains plain text or span.</p>
  
  <pre><code>TextView textView1;
  textView1.setText("BlahBlahBlah");
  
  TextView textView2;
  final SpannableStringBuilder sb = new SpannableStringBuilder(title);
                                                          final ForegroundColorSpan fcs = new ForegroundColorSpan(Color.rgb(255,255,255));
                                                          sb.setSpan(fcs,  bookname.length(),title.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
  textView2.setText(sb);
  </code></pre>
  
  <p>Now I need a method like this : <strong>textView1.hasSpans()</strong></p>