public Drawable doGetCaptchaTask(Task task) {
Drawable drawable = null;
Map<String, Object> taskParams = task.getTaskParams();
String captchaUrl = (String) taskParams.get(Task.TA_GETCAPTCHA_CAPTCHAURL);
String get_captcha_url = HttpClientUtil.BASE_URL + "image/code/" + captchaUrl;
try {
get_captcha_url = StringUtil.replaceBlank(get_captcha_url);
drawable = HttpClientUtil.getCaptcha(get_captcha_url);
} catch (Exception e) {
e.printStackTrace(); // 如果没有连接网络，就会抛出异常，result就会为初值TA_NO：no
}
return drawable;
}
