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

Introduction

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

Source

/***
  Copyright (c) 2008-2011 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.
       
  From _The Busy Coder's Guide to Android Development_
http://commonsware.com/Android
*/

package com.commonsware.android.strict;

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.HttpClient;
import org.apache.http.client.ResponseHandler;
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;
import android.app.Activity;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.StrictMode;
import android.webkit.WebView;
import android.widget.Toast;

public class WeatherDemo extends Activity {
    private LocationManager mgr = 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);

        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectAll().penaltyLog().build());

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

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

        mgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3600000, 1000, onLocationChange);
    }

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

        mgr.removeUpdates(onLocationChange);
    }

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

        client.getConnectionManager().shutdown();
    }

    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) {
            android.util.Log.e("WeatherDemo", "Exception fetching data", t);
            Toast.makeText(this, "Request failed: " + t.toString(), Toast.LENGTH_LONG).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() {
        StringBuilder bufResult = new StringBuilder("<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;
        }
    }
}