Java tutorial
/*------------------------------------------------------------------------------ ** Ident: Sogeti Smart Mobile Solutions ** Author: rene ** Copyright: (c) Apr 24, 2011 Sogeti Nederland B.V. All Rights Reserved. **------------------------------------------------------------------------------ ** Sogeti Nederland B.V. | No part of this file may be reproduced ** Distributed Software Engineering | or transmitted in any form or by any ** Lange Dreef 17 | means, electronic or mechanical, for the ** 4131 NJ Vianen | purpose, without the express written ** The Netherlands | permission of the copyright holder. *------------------------------------------------------------------------------ * * This file is part of OpenGPSTracker. * * OpenGPSTracker 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. * * OpenGPSTracker 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 OpenGPSTracker. If not, see <http://www.gnu.org/licenses/>. * */ package com.mutu.gpstracker.breadcrumbs; import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import java.util.HashSet; import java.util.LinkedList; import java.util.Set; import com.mutu.gpstracker.R; import oauth.signpost.OAuthConsumer; import oauth.signpost.exception.OAuthCommunicationException; import oauth.signpost.exception.OAuthExpectationFailedException; import oauth.signpost.exception.OAuthMessageSignerException; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpUriRequest; import org.apache.http.impl.client.DefaultHttpClient; //import org.apache.ogt.http.Header; //import org.apache.ogt.http.HttpEntity; //import org.apache.ogt.http.HttpResponse; //import org.apache.ogt.http.client.methods.HttpGet; //import org.apache.ogt.http.client.methods.HttpUriRequest; //import org.apache.ogt.http.impl.client.DefaultHttpClient; //import org.apache.ogt.http.util.EntityUtils; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import org.xmlpull.v1.XmlPullParserFactory; import com.mutu.gpstracker.actions.tasks.XmlCreator; import com.mutu.gpstracker.actions.utils.ProgressListener; import com.mutu.gpstracker.adapter.BreadcrumbsAdapter; import android.content.Context; import android.util.Log; /** * An asynchronous task that communicates with Twitter to retrieve a request * token. (OAuthGetRequestToken) After receiving the request token from Twitter, * pop a browser to the user to authorize the Request Token. * (OAuthAuthorizeToken) */ public class GetBreadcrumbsBundlesTask extends BreadcrumbsTask { final String TAG = "OGT.GetBreadcrumbsBundlesTask"; private OAuthConsumer mConsumer; private DefaultHttpClient mHttpclient; private Set<Integer> mBundleIds; private LinkedList<Object[]> mBundles; /** * We pass the OAuth consumer and provider. * * @param mContext Required to be able to start the intent to launch the * browser. * @param httpclient * @param listener * @param provider The OAuthProvider object * @param mConsumer The OAuthConsumer object */ public GetBreadcrumbsBundlesTask(Context context, BreadcrumbsService adapter, ProgressListener listener, DefaultHttpClient httpclient, OAuthConsumer consumer) { super(context, adapter, listener); mHttpclient = httpclient; mConsumer = consumer; } /** * Retrieve the OAuth Request Token and present a browser to the user to * authorize the token. */ @Override protected Void doInBackground(Void... params) { HttpEntity responseEntity = null; mBundleIds = new HashSet<Integer>(); mBundles = new LinkedList<Object[]>(); try { HttpUriRequest request = new HttpGet("http://api.gobreadcrumbs.com/v1/bundles.xml"); if (isCancelled()) { throw new IOException("Fail to execute request due to canceling"); } mConsumer.sign(request); if (BreadcrumbsAdapter.DEBUG) { Log.d(TAG, "Execute request: " + request.getURI()); for (Header header : request.getAllHeaders()) { Log.d(TAG, " with header: " + header.toString()); } } HttpResponse response = mHttpclient.execute(request); responseEntity = response.getEntity(); InputStream is = responseEntity.getContent(); InputStream stream = new BufferedInputStream(is, 8192); if (BreadcrumbsAdapter.DEBUG) { stream = XmlCreator.convertStreamToLoggedStream(TAG, stream); } XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); factory.setNamespaceAware(true); XmlPullParser xpp = factory.newPullParser(); xpp.setInput(stream, "UTF-8"); String tagName = null; int eventType = xpp.getEventType(); String bundleName = null, bundleDescription = null; Integer bundleId = null; while (eventType != XmlPullParser.END_DOCUMENT) { if (eventType == XmlPullParser.START_TAG) { tagName = xpp.getName(); } else if (eventType == XmlPullParser.END_TAG) { if ("bundle".equals(xpp.getName()) && bundleId != null) { mBundles.add(new Object[] { bundleId, bundleName, bundleDescription }); } tagName = null; } else if (eventType == XmlPullParser.TEXT) { if ("description".equals(tagName)) { bundleDescription = xpp.getText(); } else if ("id".equals(tagName)) { bundleId = Integer.parseInt(xpp.getText()); mBundleIds.add(bundleId); } else if ("name".equals(tagName)) { bundleName = xpp.getText(); } } eventType = xpp.next(); } } catch (OAuthMessageSignerException e) { mService.removeAuthentication(); handleError(mContext.getString(R.string.taskerror_breadcrumbs_bundle), e, "Failed to sign the request with authentication signature"); } catch (OAuthExpectationFailedException e) { mService.removeAuthentication(); handleError(mContext.getString(R.string.taskerror_breadcrumbs_bundle), e, "The request did not authenticate"); } catch (OAuthCommunicationException e) { mService.removeAuthentication(); handleError(mContext.getString(R.string.taskerror_breadcrumbs_bundle), e, "The authentication communication failed"); } catch (IOException e) { handleError(mContext.getString(R.string.taskerror_breadcrumbs_bundle), e, "A problem during communication"); } catch (XmlPullParserException e) { handleError(mContext.getString(R.string.taskerror_breadcrumbs_bundle), e, "A problem while reading the XML data"); } catch (IllegalStateException e) { handleError(mContext.getString(R.string.taskerror_breadcrumbs_bundle), e, "A problem during communication"); } finally { if (responseEntity != null) { try { //EntityUtils.consume(responseEntity); responseEntity.consumeContent(); } catch (IOException e) { Log.w(TAG, "Failed closing inputstream"); } } } return null; } @Override protected void updateTracksData(BreadcrumbsTracks tracks) { tracks.setAllBundleIds(mBundleIds); for (Object[] bundle : mBundles) { Integer bundleId = (Integer) bundle[0]; String bundleName = (String) bundle[1]; String bundleDescription = (String) bundle[2]; tracks.addBundle(bundleId, bundleName, bundleDescription); } } }