com.commonsware.android.internet.WeatherDemo.java Source code

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Here is the source code for com.commonsware.android.internet.WeatherDemo.java

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/***
   Copyright (c) 2008-2009 CommonsWare, LLC
       
   Licensed under the Apache License, Version 2.0 (the "License"); you may
   not use this file except in compliance with the License. You may obtain
   a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package com.commonsware.android.internet;

import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.webkit.WebView;
import android.widget.Toast;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class WeatherDemo extends Activity {
    private LocationManager myLocationManager = null;
    private String format;
    private WebView browser;
    private HttpClient client;
    private List<Forecast> forecasts = new ArrayList<Forecast>();

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);

        myLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        format = getString(R.string.url);
        browser = (WebView) findViewById(R.id.webkit);
        client = new DefaultHttpClient();
    }

    @Override
    public void onResume() {
        super.onResume();

        myLocationManager.requestLocationUpdates("gps", 0, 10000.0f, onLocationChange);
    }

    @Override
    public void onPause() {
        super.onPause();

        myLocationManager.removeUpdates(onLocationChange);
    }

    private void updateForecast(Location loc) {
        String url = String.format(format, loc.getLatitude(), loc.getLongitude());
        HttpGet getMethod = new HttpGet(url);

        try {
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String responseBody = client.execute(getMethod, responseHandler);

            buildForecasts(responseBody);

            String page = generatePage();

            browser.loadDataWithBaseURL(null, page, "text/html", "UTF-8", null);
        } catch (Throwable t) {
            Toast.makeText(this, "Request failed: " + t.toString(), 4000).show();
        }
    }

    void buildForecasts(String raw) throws Exception {
        DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        Document doc = builder.parse(new InputSource(new StringReader(raw)));
        NodeList times = doc.getElementsByTagName("start-valid-time");

        for (int i = 0; i < times.getLength(); i++) {
            Element time = (Element) times.item(i);
            Forecast forecast = new Forecast();

            forecasts.add(forecast);
            forecast.setTime(time.getFirstChild().getNodeValue());
        }

        NodeList temps = doc.getElementsByTagName("value");

        for (int i = 0; i < temps.getLength(); i++) {
            Element temp = (Element) temps.item(i);
            Forecast forecast = forecasts.get(i);

            forecast.setTemp(new Integer(temp.getFirstChild().getNodeValue()));
        }

        NodeList icons = doc.getElementsByTagName("icon-link");

        for (int i = 0; i < icons.getLength(); i++) {
            Element icon = (Element) icons.item(i);
            Forecast forecast = forecasts.get(i);

            forecast.setIcon(icon.getFirstChild().getNodeValue());
        }
    }

    String generatePage() {
        StringBuffer bufResult = new StringBuffer("<html><body><table>");

        bufResult.append("<tr><th width=\"50%\">Time</th>" + "<th>Temperature</th><th>Forecast</th></tr>");

        for (Forecast forecast : forecasts) {
            bufResult.append("<tr><td align=\"center\">");
            bufResult.append(forecast.getTime());
            bufResult.append("</td><td align=\"center\">");
            bufResult.append(forecast.getTemp());
            bufResult.append("</td><td><img src=\"");
            bufResult.append(forecast.getIcon());
            bufResult.append("\"></td></tr>");
        }

        bufResult.append("</table></body></html>");

        return (bufResult.toString());
    }

    LocationListener onLocationChange = new LocationListener() {
        public void onLocationChanged(Location location) {
            updateForecast(location);
        }

        public void onProviderDisabled(String provider) {
            // required for interface, not used
        }

        public void onProviderEnabled(String provider) {
            // required for interface, not used
        }

        public void onStatusChanged(String provider, int status, Bundle extras) {
            // required for interface, not used
        }
    };

    class Forecast {
        String time = "";
        Integer temp = null;
        String iconUrl = "";

        String getTime() {
            return (time);
        }

        void setTime(String time) {
            this.time = time.substring(0, 16).replace('T', ' ');
        }

        Integer getTemp() {
            return (temp);
        }

        void setTemp(Integer temp) {
            this.temp = temp;
        }

        String getIcon() {
            return (iconUrl);
        }

        void setIcon(String iconUrl) {
            this.iconUrl = iconUrl;
        }
    }
}