Android Open Source - Blue-Sky-Weather Forecast Parser Task

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (C) 2011 David Schonert/*from  ww  w . j ava2s .c om*/
 *
 * This file is part of BlueSky.
 *
 * BlueSky is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * BlueSky is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with BlueSky.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.SyntheticCode.BlueSkyWeather;

import java.io.UnsupportedEncodingException;

import com.SyntheticCode.BlueSkyWeather.parsers.ForecastParser;
import android.content.Context;
import android.os.AsyncTask;
import android.widget.Toast;

/**
 * @author David
 * Starts an AsyncTask for parsing the forecast.
 * Displays a ProgressDialog while parsing. Parse can be canceled with back button.
 */
public class ForecastParserTask extends AsyncTask<CityData, Void, ForecastData> {
  BlueSkyActivity parent = null;
  Context appContext = null;
  
  private ForecastParser parser;
  
  public ForecastParserTask(BlueSkyActivity activity) {
    // Get the application context so that if the activity is destroyed
    // while thread is running the context will not be null.
    appContext = activity.getApplicationContext();
    
    attach(activity);
  }
  
  public void attach(BlueSkyActivity activity) {
    this.parent = activity;
  }
  
  public void detach() {
    this.parent = null;
  }
  
  protected ForecastData doInBackground(CityData... params) {
    ForecastData forecast = null;
    
    // Try creating the parser and then parsing
    try {
      parser = new ForecastParser(appContext, params[0]);
      forecast = parser.parse();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    }
    
    return forecast;
  }
  
  protected void onPostExecute(ForecastData result) {
    if(result != null) {
      
      parent.currentForecast = result;
      
      parent.ui.updateForecastTab(parent.currentForecast);
    }
    else {
      // Warn user
      Toast.makeText(parent, "Network Error", Toast.LENGTH_LONG).show();
    }
    
  }
  
  public boolean stopParsing() {
    if(parser != null) {
      parser.stopParse();
    }
    // Cancel the AsyncTask (isCancled() needs to be checked during doInBackground())
    return cancel(true);
  }
}

Java Source Code List

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