將獲取到的富文本字符串調用下面方法，即可適配屏幕，佔滿一屏幕！！！
private String getHtmlData(String bodyHTML) {
String head = "<head>"+ "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, user-scalable=no\"> "
+ "<style>img{max-width: 100%; width:auto; height:auto;}</style>"
+ "</head>";
return "<html>" + head + "<body>" + bodyHTML + "</body></html>";
}