问题描述:

I need to extract the value from "condition" but the one that's under "current_conditions".

Here is the code I have right now. It extracts value from condition but from "forecast_conditions". By the way i'm using SAXParser.

if (localName.equals("condition")) {

String con = attributes.getValue("data");

info.setCondition(con);

}

Here is the XML.

<current_conditions>

<condition data="Clear"/>

</current_conditions>

<forecast_conditions>

<condition data="Partly Sunny"/>

</forecast_conditions>

网友答案:

Which parser do you use? If you use XmlPullParser (or any SAX style parser), you can set a flag when you encounter current_conditions START_TAG and check whether this flag is set when you check for condition. Don't forget to reset the flag when you encounter current_conditions END_TAG.

网友答案:

I'll second XmlPullParser - it's very easy to understand.

Here is some code for you case (not tested)

public void parser(InputStream is) {
    XmlPullParserFactory factory;
    try {
        factory = XmlPullParserFactory.newInstance();
        factory.setNamespaceAware(true);
        XmlPullParser xpp = factory.newPullParser();
        xpp.setInput(is, null);

        boolean currentConditions = false;
        String curentCondition;

        int eventType = xpp.getEventType();
        while (eventType != XmlPullParser.END_DOCUMENT) {
            if (eventType == XmlPullParser.START_TAG) {
                if (xpp.getName().equalsIgnoreCase("current_conditions")) {
                currentConditions = true;
                } 
                else if (xpp.getName().equalsIgnoreCase("condition") && currentConditions){
                    curentCondition = xpp.getAttributeValue(null,"Clear");
                }
            } else if (eventType == XmlPullParser.END_TAG) {
                if (xpp.getName().equalsIgnoreCase("current_conditions"))
                    currentConditions = false;
            } else if (eventType == XmlPullParser.TEXT) {
            }
            eventType = xpp.next();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}
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