文字链接效果

SpannableStringBuilder stringBuilder = new SpannableStringBuilder("系统已发送一组验证码到您的手机。\n如未收到，20秒后点此重发>>>");
        ClickableSpan clickableSpan = new ClickableSpan() {
            @Override
            public void onClick(View widget) {
                //todo
            }

            @Override
            public void updateDrawState(TextPaint ds) {
               //为响应事件的文字设置颜色
                ds.setColor(ds.linkColor);
                // 去掉下划线
                ds.setUnderlineText(false);
            }
        };
        // 取可响应事件的文字段
        stringBuilder.setSpan(clickableSpan, stringBuilder.length() - 7, stringBuilder.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
        tv_message.setMovementMethod(LinkMovementMethod.getInstance());
        tv_message.setText(stringBuilder);