protected void bindToDrawable(Drawable drawable) {
    unbindFromPreviousComponent();
    mBoundDrawable = drawable;
  }
DraweeSpanStringBuilder that can be used to add {@link DraweeSpan}s to strings.

<p>The containing view must also call {@link #onDetachFromView(View)} ()} from its {@link
View#onStartTemporaryDetach()} and {@link View#onDetachedFromWindow()} methods. Similarly, it
must call {@link #onAttachToView(View)} from its {@link View#onFinishTemporaryDetach()} and
{@link View#onAttachedToWindow()} methods.

<p>If you attach the same DraweeSpanStringBuilder to different views, only the most recent view
will be updated correctly since you can only bind the same builder to 1 view at a time. Older
views will be automatically unbound.

<p>{@see DraweeHolder}
drawee-span/src/main/java/com/facebook/drawee/span/DraweeSpanStringBuilder.java