dk.moerks.ratebeermobile.io.TwitterPoster.java Source code

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Here is the source code for dk.moerks.ratebeermobile.io.TwitterPoster.java

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/*
 * Copyright 2010, Jesper Fussing Mrk
 *
 * 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;
    }*/

}