Android Open Source - storage_room_android_example Announcement Downloader

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License

The source code is released under:

Copyright (c) 2011 Till Simon http://www.tillsimon.com mail@tillsimon.com Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation f...

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Java Source Code

package com.tillsimon.storageroom_example.model.webconnect;
//  w  ww  .ja  v  a 2s .  co m
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import org.json.JSONObject;

import com.tillsimon.storageroom_example.application.AppConfigInterface;

import android.os.AsyncTask;
import android.util.Log;

public class AnnouncementDownloader extends AsyncTask<Void, Integer, Boolean> {

  private AnnouncementDownloaderDelegate mDelegate;
  private Exception mThrownException;
  private HttpGet mHttpRequest;
  private String mAnnouncementText;
  private String mAnnouncementUrl;
  
  public AnnouncementDownloader(AnnouncementDownloaderDelegate delegate) {
    super();
    mDelegate = delegate;
  }

  @Override
  protected void onPreExecute() {
    mDelegate.onAnnouncementDownloadStart(this);
  }
  
  @Override
  protected Boolean doInBackground(Void... params) {
    boolean successful = downloadAnnouncements();
    return successful;
  }
  
  @Override
  protected void onProgressUpdate(Integer... progress) {
    super.onProgressUpdate(progress);
    mDelegate.onAnnouncementDownloadProgress(this, progress);
  }
  
  @Override
  protected void onPostExecute(Boolean successful) {
    if (successful) {
      mDelegate.onAnnouncementDownloadSuccess(this, mAnnouncementText, mAnnouncementUrl);
    }
    else {
      mDelegate.onAnnouncementDownloadFailure(this, mThrownException);
    }
  }
  
  @Override
  protected void onCancelled() {
    mHttpRequest.abort();
    Log.d(AppConfigInterface.TAG,"Task cancelled");
  }
  
  protected boolean downloadAnnouncements() {
    HttpResponse httpResponse;
        HttpEntity httpEntity;
        HttpClient httpClient;
        HttpParams httpParameters;
        BufferedReader bufferedReader;
        String bufferedReaderLine;
        StringBuilder jsonResponseStringBuilder;
        String jsonResponseString = "";
        mThrownException = null;
    
    httpParameters = new BasicHttpParams();
    HttpConnectionParams.setConnectionTimeout(httpParameters, AppConfigInterface.timeoutConnection);      
    HttpConnectionParams.setSoTimeout(httpParameters, AppConfigInterface.timeoutSocket);

    httpClient = new DefaultHttpClient(httpParameters);
        mHttpRequest = new HttpGet(AppConfigInterface.STORAGEROOM_ANNOUNCEMENTS_URL);
        
        if (!isCancelled()) {
          try {
            httpResponse = httpClient.execute(mHttpRequest);
              httpEntity = httpResponse.getEntity();
              bufferedReader = new BufferedReader(new InputStreamReader(httpEntity.getContent(), "UTF-8"));          
              jsonResponseStringBuilder = new StringBuilder();
              
              while (((bufferedReaderLine = bufferedReader.readLine()) != null) && (!isCancelled())) {
                  jsonResponseStringBuilder.append(bufferedReaderLine);
              }
              bufferedReader.close();            
              jsonResponseString = jsonResponseStringBuilder.toString();
        Log.d(AppConfigInterface.TAG, jsonResponseString);
          }
          catch (IOException e) {
            mThrownException = e;
            return false;
          }
        }          
        
        if (!isCancelled()) {
          try{
            JSONObject announcementsJsonObject = new JSONObject(jsonResponseString);
        JSONObject announcementsJsonArrayObject = announcementsJsonObject.getJSONObject("array");
        JSONArray announcementsJsonArray = announcementsJsonArrayObject.getJSONArray("resources");          
        JSONObject announcementsJsonArrayEntry = announcementsJsonArray.getJSONObject(0);
        mAnnouncementText = announcementsJsonArrayEntry.getString("text");
        mAnnouncementUrl = announcementsJsonArrayEntry.getString("link");
          }
          catch (Exception e) {
            mThrownException = e;
            return false;
      }
        }
        return true;
  }

}

Java Source Code List