Android Open Source - RateBeer-Mobile Twitter Poster

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright 2010, Jesper Fussing Mrk// w w  w .java 2s.co  m
 *
 * This file is part of Ratebeer Mobile for Android.
 *
 * Ratebeer Mobile 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
 * (at your option) any later version.
 *
 * Ratebeer Mobile 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 Ratebeer Mobile.  If not, see <http://www.gnu.org/licenses/>.
 */
package dk.moerks.ratebeermobile.io;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;

import android.content.Context;
import android.content.SharedPreferences;
import android.util.Log;
import dk.moerks.ratebeermobile.Settings;
import dk.moerks.ratebeermobile.exceptions.NetworkException;

public class TwitterPoster {

  private static final String LOGTAG = "TwitterPoster";

  private static final String TWITTER_UPDATE_URL = "http://api.twitter.com/1/statuses/update.json";
  private static final String SOURCE = "RateBeer Mobile";
  
  private String name;
  private String password;

  private TwitterPoster(String name, String password) {
    this.name = name;
    this.password = password;
  }
  
  /**
   * Build a TwitterPoster based on the user preferences
   * @param context The application context to get the user preferences from
   * @return A reusable TwitterPoster object
   */
  public static TwitterPoster buildFromPreferences(Context context) {
    
    // Retrieve the Twitter user credentials from the application preferences
    SharedPreferences settings = context.getSharedPreferences(Settings.PREFERENCETAG, 0);
    // And return the Twitter poster object instance
    return new TwitterPoster(
        settings.getString("rb_twitter_username", ""), 
        settings.getString("rb_twitter_password", ""));
    
  }
  
  /**
   * Updates the Twitter status text of the user
   * @param context Application context for error logging
   * @param status The new status text
   * @throws NetworkException When either a network error occurred or the Twitter status could not be set
   */
  public void updateStatus(Context context, String status) throws NetworkException {

    // Send status update POST request
    List<NameValuePair> parameters = new ArrayList<NameValuePair>();  
    parameters.add(new BasicNameValuePair("status", status));
    HttpResponse result = postRequest(context, TWITTER_UPDATE_URL, parameters);
    
    // Check response result
    //String response = responseString(result);
    Log.d(LOGTAG, "TW_CODE: " + result.getStatusLine().getStatusCode());
    if (result.getStatusLine().getStatusCode() != 200) {
      throw new NetworkException(context, LOGTAG, "Update of Twitter status was unsuccessfull", null);
    }

  }

  private HttpResponse postRequest(Context context, String url, List<NameValuePair> parameters) throws NetworkException {

    // Set up our own HttpClient
    DefaultHttpClient client = new DefaultHttpClient(new BasicHttpParams());
    HttpPost post = new HttpPost(url);
    
    // Set RateBeer Mobile as twit source
    parameters.add(new BasicNameValuePair("source", SOURCE));
    
    // Basic authentication of our Twitter user
    client.getCredentialsProvider().setCredentials(
      new AuthScope("api.twitter.com", 80),
      new UsernamePasswordCredentials(this.name, this.password));
    
    try {
      
      // Send POST request
      post.setEntity(new UrlEncodedFormEntity(parameters));
      return client.execute(post);
      
    } catch (UnsupportedEncodingException e) {
      throw new NetworkException(context, LOGTAG, "Network Error - Cannot build Twitter request", e);
    } catch (ClientProtocolException e) {
      throw new NetworkException(context, LOGTAG, "Network Error - Cannot build Twitter request", e);
    } catch (IOException e) {
      throw new NetworkException(context, LOGTAG, "Network Error - Do you have a network connection?", e);
    }  
    
  }

  /*private String responseString(HttpResponse response){
    try {
      ByteArrayOutputStream ostream = new ByteArrayOutputStream();  
      response.getEntity().writeTo(ostream);
      //return ostream.toString("ISO8859_1");
      return ostream.toString("windows-1252"); 
    } catch(IOException e){
      e.printStackTrace();
    }
    return null;
  }*/
  
}

Java Source Code List

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