Java tutorial
/* * Copyright (c) 2016 Washington State Department of Transportation * * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/> * */ package gov.wa.wsdot.mobile.client.activities.socialmedia.blogger; import com.google.gwt.jsonp.client.JsonpRequestBuilder; import com.google.gwt.user.client.Timer; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.AcceptsOneWidget; import com.google.web.bindery.event.shared.EventBus; import com.googlecode.gwtphonegap.client.PhoneGap; import com.googlecode.gwtphonegap.client.inappbrowser.InAppBrowser; import com.googlecode.gwtphonegap.client.notification.AlertCallback; import com.googlecode.mgwt.mvp.client.MGWTAbstractActivity; import com.googlecode.mgwt.ui.client.widget.panel.pull.PullArrowStandardHandler; import com.googlecode.mgwt.ui.client.widget.panel.pull.PullArrowStandardHandler.PullActionHandler; import gov.wa.wsdot.mobile.client.ClientFactory; import gov.wa.wsdot.mobile.client.event.ActionEvent; import gov.wa.wsdot.mobile.client.event.ActionNames; import gov.wa.wsdot.mobile.client.plugins.accessibility.Accessibility; import gov.wa.wsdot.mobile.client.plugins.analytics.Analytics; import gov.wa.wsdot.mobile.client.util.Consts; import gov.wa.wsdot.mobile.shared.BlogFeed; import gov.wa.wsdot.mobile.shared.BlogItem; import java.util.ArrayList; public class BlogActivity extends MGWTAbstractActivity implements BlogView.Presenter { private final ClientFactory clientFactory; private BlogView view; private EventBus eventBus; private PhoneGap phoneGap; private Analytics analytics; private InAppBrowser inAppBrowser; private Accessibility accessibility; private static ArrayList<BlogItem> blogItems = new ArrayList<BlogItem>(); private static final String BLOG_FEED_URL = "http://wsdotblog.blogspot.com/feeds/posts/default?alt=json&max-results=10"; public BlogActivity(ClientFactory clientFactory) { this.clientFactory = clientFactory; } @Override public void start(AcceptsOneWidget panel, final EventBus eventBus) { view = clientFactory.getBlogView(); phoneGap = clientFactory.getPhoneGap(); analytics = clientFactory.getAnalytics(); accessibility = clientFactory.getAccessibility(); inAppBrowser = this.phoneGap.getInAppBrowser(); this.eventBus = eventBus; view.setPresenter(this); view.getPullHeader().setHTML("pull down"); PullArrowStandardHandler headerHandler = new PullArrowStandardHandler(view.getPullHeader(), view.getPullPanel()); headerHandler.setErrorText("Error"); headerHandler.setLoadingText("Loading"); headerHandler.setNormalText("pull down"); headerHandler.setPulledText("release to load"); headerHandler.setPullActionHandler(new PullActionHandler() { @Override public void onPullAction(final AsyncCallback<Void> callback) { new Timer() { @Override public void run() { createBlogList(view); view.refresh(); callback.onSuccess(null); } }.schedule(1); } }); view.setHeaderPullHandler(headerHandler); createBlogList(view); if (Consts.ANALYTICS_ENABLED) { analytics.trackScreen("/Social Media/Blog"); } panel.setWidget(view); accessibility.postScreenChangeNotification(); } @Override public void onStop() { view.setPresenter(null); } @Override public void onItemSelected(int index) { if (Consts.ANALYTICS_ENABLED) { analytics.trackScreen("/Social Media/Blog/Details Link"); } BlogItem item = blogItems.get(index); inAppBrowser.open(item.getLink(), "_blank", "enableViewportScale=yes,transitionstyle=fliphorizontal"); } @Override public void onBackButtonPressed() { ActionEvent.fire(eventBus, ActionNames.BACK); } private void createBlogList(final BlogView view) { blogItems.clear(); view.showProgressIndicator(); JsonpRequestBuilder jsonp = new JsonpRequestBuilder(); // Set timeout for 30 seconds (30000 milliseconds) jsonp.setTimeout(30000); jsonp.requestObject(BLOG_FEED_URL, new AsyncCallback<BlogFeed>() { @Override public void onFailure(Throwable caught) { view.hideProgressIndicator(); phoneGap.getNotification().alert("Can't load data. Check your connection.", new AlertCallback() { @Override public void onOkButtonClicked() { // TODO Auto-generated method stub } }, "Connection Error"); } @Override public void onSuccess(BlogFeed result) { BlogItem item = null; if (result.getFeed() != null) { int numEntries = result.getFeed().getEntry().length(); for (int i = 0; i < numEntries; i++) { item = new BlogItem(); item.setTitle(result.getFeed().getEntry().get(i).getTitle().getT()); item.setContent(result.getFeed().getEntry().get(i).getContent().getT()); item.setDescription(""); item.setImageUrl(""); item.setPublished(result.getFeed().getEntry().get(i).getPublished().getT()); item.setLink(result.getFeed().getEntry().get(i).getLink().get(4).getHref()); blogItems.add(item); } view.hideProgressIndicator(); view.render(blogItems); view.refresh(); accessibility.postScreenChangeNotification(); } } }); } }