java如何在安卓中解析yahoo天气xml

Question

我是安卓新手，我想开发一个示例应用程序，在我的安卓应用程序中显示天气，我正在使用URL“http://weather.yahooapis.com/forecastrss?w=2295425&u=c&#8221”，在我的应用程序中，所有字段的输出都返回null。我无法解析url。请帮帮我。这是我正在使用的代码：

import java.net.URL;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import 安卓.os.Bundle;
import 安卓.app.Activity;
import 安卓.view.Menu;
import 安卓.widget.LinearLayout;
import 安卓.widget.TextView;

public class YahooWeatherMainActivity extends Activity {

    String url = "http://weather.yahooapis.com/forecastrss?w=2295425&u=c&#8221";

    SetterGetter setterGetter = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_yahoo_weather_main);
        abc();

    }

    public void abc() {
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(1);

        TextView today_date;
        TextView city;
        TextView region;
        TextView country;
        TextView temp;
        TextView humidity;
        TextView wind;
        TextView sunnise;
        TextView sunset;
        TextView date[];
        TextView day[];
        TextView low[];
        TextView high[];
        TextView text[];

        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();
            URL sourceUrl = new URL(url);
            MyXMLHandler myXMLHandler = new MyXMLHandler();
            xr.setContentHandler(myXMLHandler);
            xr.parse(new InputSource(sourceUrl.openStream()));

        } catch (Exception e) {
            System.out.println("XML Pasing Excpetion = " + e);
        }

        setterGetter = MyXMLHandler.setterGetter;

        today_date = new TextView(this);
        today_date.setText("Today_Date = " + setterGetter.getToday_date());

        city = new TextView(this);
        city.setText("City = " + setterGetter.getCity());
        region = new TextView(this);
        region.setText("region = " + setterGetter.getRegion());

        country = new TextView(this);
        country.setText("Date = " + setterGetter.getCountry());

        temp = new TextView(this);
        temp.setText("temp = " + setterGetter.getTemp());

        humidity = new TextView(this);
        humidity.setText("humidity = " + setterGetter.getHumidity());

        wind = new TextView(this);
        wind.setText("wind = " + setterGetter.getWind());

        sunnise = new TextView(this);
        sunnise.setText("sunnise = " + setterGetter.getSunnise());

        sunset = new TextView(this);
        sunset.setText("Sunset = " + setterGetter.getSunset());

        date = new TextView[setterGetter.getDate().size()];
        day = new TextView[setterGetter.getDate().size()];
        low = new TextView[setterGetter.getDate().size()];
        high = new TextView[setterGetter.getDate().size()];
        text = new TextView[setterGetter.getDate().size()];
        layout.addView(today_date);
        layout.addView(city);
        layout.addView(region);
        layout.addView(country);
        layout.addView(temp);
        layout.addView(humidity);
        layout.addView(wind);
        layout.addView(sunnise);
        layout.addView(sunset);

        for (int i = 0; i < setterGetter.getDate().size(); i++) {
            date[i] = new TextView(this);
            date[i].setText("Date = " + setterGetter.getDate().get(i));
            day[i] = new TextView(this);
            day[i].setText("Day = " + setterGetter.getDay().get(i));
            low[i] = new TextView(this);
            low[i].setText("low = " + setterGetter.getLow().get(i));
            high[i] = new TextView(this);
            high[i].setText("high = " + setterGetter.getHigh().get(i));
            text[i] = new TextView(this);
            text[i].setText("Condition = " + setterGetter.getText().get(i));
            layout.addView(date[i]);
            layout.addView(day[i]);
            layout.addView(low[i]);
            layout.addView(high[i]);
            layout.addView(text[i]);

        }
        setContentView(layout);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.yahoo_weather_main, menu);
        return true;
    }

}





import java.util.ArrayList;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class MyXMLHandler extends DefaultHandler {

    Boolean currentElement = false;
    String currentValue = null;

    public static SetterGetter setterGetter = null;

    public static SetterGetter getList() {
        return setterGetter;
    }

    public static void setSitesList(SetterGetter sitesList) {
        MyXMLHandler.setterGetter = setterGetter;
    }

    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        if (currentElement) {
            currentValue = new String(ch, start, length);
            currentElement = false;
        }
    }

    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        currentElement = false;

        if (localName.equalsIgnoreCase("lastBuildDate"))
            setterGetter.setToday_date(currentValue);

    }

    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        currentElement = true;
        if (localName.equals("rss")) {
            setterGetter = new SetterGetter();
        } else if (localName.equals("channel")) {
            String date = attributes.getValue("date");
            setterGetter.setDate(date);
            String day = attributes.getValue("day");
            setterGetter.setDay(day);

            String low = attributes.getValue("low");
            setterGetter.setLow(low);

            String high = attributes.getValue("high");
            setterGetter.setHigh(high);

            String text = attributes.getValue("text");
            setterGetter.setText(text);

        } else if (localName.equals("yweather:location")) {
            String city = attributes.getValue("city");
            setterGetter.setCity(city);

            String region = attributes.getValue("region");
            setterGetter.setRegion(region);

            String country = attributes.getValue("country");
            setterGetter.setCountry(country);

        }

        else if (localName.equals("yweather:wind")) {
            String chill = attributes.getValue("chill");
            setterGetter.setTemp(chill);
            String speed = attributes.getValue("speed");
            setterGetter.setWind(speed);
        } else if (localName.equals("yweather:atmosphere")) {
            String humidity = attributes.getValue("humidity");
            setterGetter.setHumidity(humidity);
        } else if (localName.equals("yweather:astronomy")) {
            String sunrise = attributes.getValue("sunrise");
            setterGetter.setSunnise(sunrise);

            String sunset = attributes.getValue("sunset");
            setterGetter.setSunset(sunset);

        }
    }

}