Android Open Source - meteoapp Fetch Forecast Task

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License

The source code is released under:

MIT License

Java Source Code

package pl.sznapka.meteoapp;
//from w  w w . j  a  v a  2 s  .  co  m
import java.io.File;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashMap;

import pl.sznapka.meteo.fetcher.FetcherException;
import pl.sznapka.meteo.fetcher.ForecastFetcher;
import pl.sznapka.meteo.http.HttpClient;
import pl.sznapka.meteo.image.ImageProcessingException;
import pl.sznapka.meteo.image.Processor;
import pl.sznapka.meteo.valueobject.City;
import pl.sznapka.meteo.valueobject.Forecast;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;

public class FetchForecastTask extends AsyncTask<City, Void, ChoosenForecast> {

  protected ProgressDialog progressDialog;
  protected WeakReference<Activity> parent;
  protected ArrayList<String> types;
  protected CacheManager cache;
  protected Exception exception;
  
  public FetchForecastTask(Activity parent, ArrayList<String> types, CacheManager cache) {
    
    super();
    this.parent = new WeakReference<Activity>(parent);
    this.types = types;
    this.cache = cache;
  }
  
  @Override
  protected ChoosenForecast doInBackground(City... cities) {

    try {
      ForecastFetcher fetcher = new ForecastFetcher(cities[0], new HttpClient(), cache.getDefaultCacheDir());
      ArrayList<Forecast> result = fetcher.fetch();
      Forecast current = result.get(0);  
      Processor processor = new Processor();
      HashMap<String, String> diagrams = processor.extractDiagrams(current, types);

      ArrayList<String> choosenDiagrams = new ArrayList<String>();
      for (String key : types) {
        choosenDiagrams.add(diagrams.get(key));
      }
      
      return new ChoosenForecast(current, choosenDiagrams, types);
    } catch (Exception e) {
      e.printStackTrace();
      exception = e;
    }
    
    return null;
  }
  
  protected void onPreExecute() {

    super.onPreExecute();
    progressDialog = new ProgressDialog(parent.get());
    progressDialog.setTitle("Pobieram");
    progressDialog.setMessage("Prosz? czeka?, pobieranie prognozy");
    progressDialog.show();
  }
  
  protected void onPostExecute(ChoosenForecast choosenForecast) {
  
    if (exception == null) {
      cache.storeObjectInCache("forecast", choosenForecast);
      if (parent.get().getClass() == MeteoappActivity.class) {
        ((MeteoappActivity) parent.get()).choosenForecast = choosenForecast;
        Intent intent = new Intent(parent.get(), ForecastActivity.class);
        Bundle bundle = new Bundle();
        bundle.putSerializable("choosenForecast", choosenForecast);
           intent.putExtras(bundle);
        parent.get().startActivity(intent);
      } else if (parent.get().getClass() == ForecastActivity.class) {
        ((ForecastActivity) parent.get()).displayForecast(choosenForecast);
      }
    } else {
      new ExceptionHandler(parent.get(), exception).handle();
    }
    progressDialog.dismiss();
  }
}

Java Source Code List

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