public void detachCurrentDraweeSpanStringBuilder() {
    if (mDraweeStringBuilder != null) {
      mDraweeStringBuilder.onDetachFromView(this);
    }
    mDraweeStringBuilder = null;
  }
Detaches the currently attached DraweeSpanStringBuilder (if there is one) so that this view can
be used as a normal text view instead.
drawee-span/src/main/java/com/facebook/drawee/span/SimpleDraweeSpanTextView.java