DraweeTextView:对于bibili分享的DraweeText进一步定制，可使图文居中对齐

DraweeTextView 基于简单的可缩放的文本视图。 用法 DraweeTextView textview = ( DraweeTextView )findViewById( R . id . text); SpannableStringBuilder builder = new SpannableStringBuilder (); builder . append( " 2333333 \n " ) start = builder . length(); builder . append( " [emotion:tv_cheers] " ); DraweeSpan span = new DraweeSpan ( " http://static.yo9.com/web/emotions/tv_cheers.png " ); builder . setSpan(span, start