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; import java.util.ArrayList; import java.util.List; import com.google.code.gwt.database.client.Database; import com.google.code.gwt.database.client.SQLError; import com.google.code.gwt.database.client.SQLTransaction; import com.google.code.gwt.database.client.TransactionCallback; import com.google.code.gwt.database.client.service.DataServiceException; import com.google.code.gwt.database.client.service.RowIdListCallback; import com.google.code.gwt.database.client.service.ScalarCallback; import com.google.code.gwt.database.client.service.VoidCallback; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.core.client.GWT; import com.google.gwt.core.client.GWT.UncaughtExceptionHandler; import com.google.gwt.core.client.JavaScriptObject; import com.google.gwt.dom.client.StyleInjector; import com.google.gwt.maps.client.LoadApi; import com.google.gwt.maps.client.LoadApi.LoadLibrary; import com.google.gwt.place.shared.Place; import com.google.gwt.user.client.History; import com.google.gwt.user.client.Timer; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.RootPanel; import com.googlecode.gwtphonegap.client.PhoneGap; import com.googlecode.gwtphonegap.client.PhoneGapAvailableEvent; import com.googlecode.gwtphonegap.client.PhoneGapAvailableHandler; import com.googlecode.gwtphonegap.client.PhoneGapTimeoutEvent; import com.googlecode.gwtphonegap.client.PhoneGapTimeoutHandler; import com.googlecode.gwtphonegap.client.event.BackButtonPressedEvent; import com.googlecode.gwtphonegap.client.event.BackButtonPressedHandler; import com.googlecode.mgwt.dom.client.event.orientation.OrientationChangeEvent; import com.googlecode.mgwt.dom.client.event.orientation.OrientationChangeHandler; import com.googlecode.mgwt.mvp.client.AnimatingActivityManager; import com.googlecode.mgwt.mvp.client.history.MGWTPlaceHistoryHandler; import com.googlecode.mgwt.ui.client.MGWT; import com.googlecode.mgwt.ui.client.MGWTSettings; import com.googlecode.mgwt.ui.client.MGWTSettings.ViewPort; import com.googlecode.mgwt.ui.client.widget.animation.AnimationWidget; import gov.wa.wsdot.mobile.client.activities.home.HomePlace; import gov.wa.wsdot.mobile.client.css.AppBundle; import gov.wa.wsdot.mobile.client.plugins.accessibility.Accessibility; import gov.wa.wsdot.mobile.client.plugins.admob.AdMob; import gov.wa.wsdot.mobile.client.plugins.admob.AdMobOptions; import gov.wa.wsdot.mobile.client.plugins.admob.AdMobOptions.AdPosition; import gov.wa.wsdot.mobile.client.plugins.analytics.Analytics; import gov.wa.wsdot.mobile.client.service.WSDOTContract.CachesColumns; import gov.wa.wsdot.mobile.client.service.WSDOTContract.FerriesSchedulesColumns; import gov.wa.wsdot.mobile.client.service.WSDOTContract.HighwayAlertsColumns; import gov.wa.wsdot.mobile.client.service.WSDOTDataService.Tables; import gov.wa.wsdot.mobile.client.util.Consts; import gov.wa.wsdot.mobile.shared.CacheItem; import gov.wa.wsdot.mobile.shared.CameraItem; public class MobileAppEntryPoint implements EntryPoint { static ClientFactory staticFactory; final static AdMob adMob = GWT.create(AdMob.class); private void start() { final ClientFactory clientFactory = new ClientFactoryImpl(); // Initialize and configure Google Analytics plugin final Analytics analytics = GWT.create(Analytics.class); analytics.initialize(); ((ClientFactoryImpl) clientFactory).setAnalytics(analytics); analytics.startTrackerWithId(Consts.ANALYTICS_TRACKING_ID); // Initialize MobileAccessibility final Accessibility accessibility = GWT.create(Accessibility.class); ((ClientFactoryImpl) clientFactory).setAccessibility(accessibility); accessibility.initialize(); staticFactory = clientFactory; final PhoneGap phoneGap = GWT.create(PhoneGap.class); phoneGap.addHandler(new PhoneGapAvailableHandler() { @Override public void onPhoneGapAvailable(PhoneGapAvailableEvent event) { ((ClientFactoryImpl) clientFactory).setPhoneGap(phoneGap); buildDisplay(clientFactory, phoneGap); if (MGWT.getOsDetection().isIOs() || MGWT.getOsDetection().isAndroid()) { try { phoneGap.getSplashScreen().hide(); } catch (Exception e) { // Just pass through. } } } }); phoneGap.addHandler(new PhoneGapTimeoutHandler() { @Override public void onPhoneGapTimeout(PhoneGapTimeoutEvent event) { Window.alert("Cannot load PhoneGap"); } }); phoneGap.initializePhoneGap(); MGWT.addOrientationChangeHandler(new OrientationChangeHandler() { @Override public void onOrientationChanged(OrientationChangeEvent event) { accessibility.isVoiceOverRunning(false); } }); adMob.initialize(); if (MGWT.getOsDetection().isIOs()) { exportInitAds(); exportVoiceOverEvent(); accessibility.isVoiceOverRunning(true); } else { // Initialize and configure AdMob plugin final AdMob adMob = GWT.create(AdMob.class); adMob.initialize(); AdMobOptions options = (AdMobOptions) JavaScriptObject.createObject().cast(); options.setAdId("/6499/example/banner"); options.setOffsetTopBar(true); options.setAutoShow(true); options.setPosition(AdPosition.TOP_CENTER.getPosition()); adMob.createBanner(options); } } /** * Callback function for MobileAccessibility.isVoiceOverRunning(callback) * * Changes banner position based on VoiceOverOn * * @param VoiceOverOn */ public static void initAds(boolean VoiceOverOn) { // Initialize and configure AdMob plugin adMob.removeBanner(); AdMobOptions options = (AdMobOptions) JavaScriptObject.createObject().cast(); options.setAdId(Consts.AD_UNIT_ID); options.setOffsetTopBar(true); options.setAutoShow(true); options.setPosition(AdPosition.TOP_CENTER.getPosition()); if (VoiceOverOn) { options.setPosition(AdPosition.BOTTOM_CENTER.getPosition()); } adMob.createBanner(options); } /** * exports java method initAds() to javascript */ public static native void exportInitAds() /*-{ $wnd.initAds = $entry(@gov.wa.wsdot.mobile.client.MobileAppEntryPoint::initAds(Z)); }-*/; /** * Sends VoiceOver event to GA * * @param voiceOverOn */ public static void voiceOverEvent(boolean voiceOverOn) { if (voiceOverOn) { if (Consts.ANALYTICS_ENABLED) { staticFactory.getAnalytics().trackEvent(Consts.EVENT_ACCESSIBILITY, "VoiceOver On", null); } } } public static native void exportVoiceOverEvent() /*-{ $wnd.voiceOverEvent = $entry(@gov.wa.wsdot.mobile.client.MobileAppEntryPoint::voiceOverEvent(Z)); }-*/; private void buildDisplay(final ClientFactory clientFactory, final PhoneGap phoneGap) { ViewPort viewPort = new MGWTSettings.ViewPort(); viewPort.setUserScaleAble(false).setMinimumScale(1.0).setInitialScale(1.0).setMaximumScale(1.0); MGWTSettings settings = new MGWTSettings(); settings.setViewPort(viewPort); settings.setIconUrl("logo.png"); settings.setFullscreen(true); settings.setFixIOS71BodyBug(true); settings.setPreventScrolling(true); MGWT.applySettings(settings); // Create initial database tables createDatabaseTables(clientFactory); phoneGap.getEvent().getBackButton().addBackButtonPressedHandler(new BackButtonPressedHandler() { @Override public void onBackButtonPressed(BackButtonPressedEvent event) { Place place = clientFactory.getPlaceController().getWhere(); if (place instanceof HomePlace) { phoneGap.exitApp(); } else { History.back(); } } }); // Start PlaceHistoryHandler with our PlaceHistoryMapper AppPlaceHistoryMapper historyMapper = GWT.create(AppPlaceHistoryMapper.class); StyleInjector.inject(AppBundle.INSTANCE.css().getText()); createPhoneDisplay(clientFactory); AppHistoryObserver historyObserver = new AppHistoryObserver(); MGWTPlaceHistoryHandler historyHandler = new MGWTPlaceHistoryHandler(historyMapper, historyObserver); historyHandler.register(clientFactory.getPlaceController(), clientFactory.getEventBus(), new HomePlace("home")); historyHandler.handleCurrentHistory(); } private void createDatabaseTables(final ClientFactory clientFactory) { final String VER_1 = "1.0"; final String VER_2 = "1.1"; final String VER_3 = "3"; final String VER_4 = "4"; final String VER_5 = "5"; final String DATABASE_VERSION = VER_5; if (clientFactory.getDbService().getDatabase().getVersion().equals("")) { clientFactory.getDbService().getDatabase().changeVersion("", DATABASE_VERSION, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { clientFactory.getDbService().createCachesTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { clientFactory.getDbService().getCachesTableCount(new ScalarCallback<Integer>() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess(Integer result) { if (result == 0) initCachesTable(clientFactory); } }); } }); clientFactory.getDbService().createLocationsTable(new VoidCallback() { @Override public void onSuccess() { } @Override public void onFailure(DataServiceException error) { } }); clientFactory.getDbService().createCamerasTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { clientFactory.getDbService() .getCamerasTableCount(new ScalarCallback<Integer>() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess(Integer result) { if (result == 0) initCamerasTable(clientFactory); } }); } }); clientFactory.getDbService().createHighwayAlertsTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); clientFactory.getDbService().createMountainPassesTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); clientFactory.getDbService().createTravelTimesTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); clientFactory.getDbService().createFerriesSchedulesTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); clientFactory.getDbService().createFerriesTerminalSailingSpaceTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); clientFactory.getDbService().createBorderWaitTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); } @Override public void onTransactionSuccess() { GWT.log("Database at version " + DATABASE_VERSION); } @Override public void onTransactionFailure(SQLError error) { } }); } if (clientFactory.getDbService().getDatabase().getVersion().equals(VER_1)) { clientFactory.getDbService().getDatabase().changeVersion(VER_1, VER_2, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { transaction.executeSql("ALTER TABLE " + Tables.HIGHWAY_ALERTS + " ADD COLUMN " + HighwayAlertsColumns.HIGHWAY_ALERT_LAST_UPDATED + " TEXT", null); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_1 + " to " + VER_2); clientFactory.getDbService().getDatabase().changeVersion(VER_2, VER_3, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { clientFactory.getDbService() .createFerriesTerminalSailingSpaceTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); transaction.executeSql( "INSERT INTO " + Tables.CACHES + " (" + CachesColumns.CACHE_TABLE_NAME + "," + CachesColumns.CACHE_LAST_UPDATED + ") values ('" + Tables.FERRIES_TERMINAL_SAILING_SPACE + "', 0)", null); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_2 + " to " + VER_3); clientFactory.getDbService().getDatabase().changeVersion(VER_3, VER_4, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { transaction.executeSql("ALTER TABLE " + Tables.FERRIES_SCHEDULES + " ADD COLUMN " + FerriesSchedulesColumns.FERRIES_SCHEDULE_CROSSING_TIME + " TEXT", null); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_3 + " to " + VER_4); clientFactory.getDbService().getDatabase().changeVersion(VER_4, VER_5, new TransactionCallback() { @Override public void onTransactionStart( SQLTransaction transaction) { clientFactory.getDbService() .createLocationsTable( new VoidCallback() { @Override public void onFailure( DataServiceException error) { } @Override public void onSuccess() { } }); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_4 + " to " + VER_5); resetCachesTable(clientFactory); } @Override public void onTransactionFailure(SQLError error) { } }); } @Override public void onTransactionFailure(SQLError error) { } }); } @Override public void onTransactionFailure(SQLError error) { } }); } @Override public void onTransactionFailure(SQLError error) { } }); } if (clientFactory.getDbService().getDatabase().getVersion().equals(VER_2)) { clientFactory.getDbService().getDatabase().changeVersion(VER_2, VER_3, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { clientFactory.getDbService().createFerriesTerminalSailingSpaceTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); transaction.executeSql("INSERT INTO " + Tables.CACHES + " (" + CachesColumns.CACHE_TABLE_NAME + "," + CachesColumns.CACHE_LAST_UPDATED + ") values ('" + Tables.FERRIES_TERMINAL_SAILING_SPACE + "', 0)", null); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_2 + " to " + VER_3); clientFactory.getDbService().getDatabase().changeVersion(VER_3, VER_4, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { transaction.executeSql("ALTER TABLE " + Tables.FERRIES_SCHEDULES + " ADD COLUMN " + FerriesSchedulesColumns.FERRIES_SCHEDULE_CROSSING_TIME + " TEXT", null); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_3 + " to " + VER_4); clientFactory.getDbService().getDatabase().changeVersion(VER_4, VER_5, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { clientFactory.getDbService() .createLocationsTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_4 + " to " + VER_5); resetCachesTable(clientFactory); } @Override public void onTransactionFailure(SQLError error) { } }); } @Override public void onTransactionFailure(SQLError error) { } }); } @Override public void onTransactionFailure(SQLError error) { } }); } if (clientFactory.getDbService().getDatabase().getVersion().equals(VER_3)) { clientFactory.getDbService().getDatabase().changeVersion(VER_3, VER_4, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { transaction.executeSql("ALTER TABLE " + Tables.FERRIES_SCHEDULES + " ADD COLUMN " + FerriesSchedulesColumns.FERRIES_SCHEDULE_CROSSING_TIME + " TEXT", null); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_3 + " to " + VER_4); clientFactory.getDbService().getDatabase().changeVersion(VER_4, VER_5, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { clientFactory.getDbService().createLocationsTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_4 + " to " + VER_5); resetCachesTable(clientFactory); } @Override public void onTransactionFailure(SQLError error) { } }); } @Override public void onTransactionFailure(SQLError error) { } }); } if (clientFactory.getDbService().getDatabase().getVersion().equals(VER_4)) { clientFactory.getDbService().getDatabase().changeVersion(VER_4, VER_5, new TransactionCallback() { @Override public void onTransactionStart(SQLTransaction transaction) { clientFactory.getDbService().createLocationsTable(new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); } @Override public void onTransactionSuccess() { GWT.log("Successfully upgraded database from version " + VER_4 + " to " + VER_5); resetCachesTable(clientFactory); } @Override public void onTransactionFailure(SQLError error) { } }); } } private void initCachesTable(ClientFactory clientFactory) { List<CacheItem> cacheItems = new ArrayList<CacheItem>(); cacheItems.add(new CacheItem("cameras", 0)); cacheItems.add(new CacheItem("highway_alerts", 0)); cacheItems.add(new CacheItem("mountain_passes", 0)); cacheItems.add(new CacheItem("travel_times", 0)); cacheItems.add(new CacheItem("ferries_schedules", 0)); cacheItems.add(new CacheItem("ferries_terminal_sailing_space", 0)); cacheItems.add(new CacheItem("border_wait", 0)); clientFactory.getDbService().initCachesTable(cacheItems, new RowIdListCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess(List<Integer> rowIds) { } }); } private void resetCachesTable(ClientFactory clientFactory) { List<CacheItem> cacheItems = new ArrayList<CacheItem>(); cacheItems.add(new CacheItem("cameras", 0)); cacheItems.add(new CacheItem("highway_alerts", 0)); cacheItems.add(new CacheItem("mountain_passes", 0)); cacheItems.add(new CacheItem("travel_times", 0)); cacheItems.add(new CacheItem("ferries_schedules", 0)); cacheItems.add(new CacheItem("ferries_terminal_sailing_space", 0)); cacheItems.add(new CacheItem("border_wait", 0)); clientFactory.getDbService().updateCachesTable(cacheItems, new VoidCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess() { } }); } private void initCamerasTable(ClientFactory clientFactory) { List<CameraItem> cameraItems = new ArrayList<CameraItem>(); cameraItems.add(new CameraItem(1134, "White Pass Summit on US12 @ MP 150.9", "http://images.wsdot.wa.gov/SC/012VC15094.jpg", 46.63404, -121.40514, 0, "US 12", 0)); cameraItems.add(new CameraItem(1138, "US 97 MP 164 Blewett Pass Summit", "http://images.wsdot.wa.gov/us97/blewett/sumtnorth.jpg", 47.334975, -120.578397, 0, "US 97", 0)); cameraItems.add(new CameraItem(4030, "SR 20 MP 214.5 (View East)", "http://images.wsdot.wa.gov/sr20/louploup/sr20louploup_east.jpg", 48.3904, -119.87925, 0, "SR 20", 0)); cameraItems.add(new CameraItem(1127, "Manastash Ridge Summit on I-82 @ MP 7", "http://images.wsdot.wa.gov/rweather/UMRidge_medium.jpg", 46.89184, -120.43773, 0, "I-82", 0)); cameraItems.add(new CameraItem(1137, "Satus Pass on US 97 @ MP 27", "http://images.wsdot.wa.gov/vancouver/097vc02711.jpg", 45.98296, -120.65381, 0, "US 97", 0)); cameraItems.add(new CameraItem(1161, "Sherman Pass on SR-20 @ MP 320", "http://images.wsdot.wa.gov/rweather/shermanpass_medium.jpg", 48.604742, -118.459912, 0, "SR 20", 0)); cameraItems.add(new CameraItem(9029, "Denny Creek on I-90 @ MP46.8", "http://images.wsdot.wa.gov/sc/090VC04680.jpg", 47.396441, -121.49935, 0, "I-90", 0)); cameraItems.add(new CameraItem(1099, "Franklin Falls on I-90 @ MP51.3", "http://images.wsdot.wa.gov/sc/090VC05130.jpg", 47.42246, -121.40991, 0, "I-90", 0)); cameraItems.add(new CameraItem(1100, "Snoqualmie Summit on I-90 @ MP52", "http://images.wsdot.wa.gov/sc/090VC05200.jpg", 47.40818, -121.40592, 0, "I-90", 0)); cameraItems.add(new CameraItem(1102, "Hyak on I-90 @ MP55.2", "http://images.wsdot.wa.gov/sc/090VC05517.jpg", 47.37325, -121.37699, 0, "I-90", 0)); cameraItems.add(new CameraItem(9018, "Price Creek on I-90 @ MP61", "http://images.wsdot.wa.gov/sc/090VC06100.jpg", 47.326814, -121.332553, 0, "I-90", 0)); cameraItems.add(new CameraItem(9019, "Easton Hill on I-90 @ MP67.4", "http://images.wsdot.wa.gov/sc/090VC06740.jpg", 47.264479, -121.284702, 0, "I-90", 0)); cameraItems.add(new CameraItem(1103, "Easton on I-90 @ MP70.6", "http://images.wsdot.wa.gov/sc/090VC07060.jpg", 47.280581, -121.185882, 0, "I-90", 0)); cameraItems.add(new CameraItem(8062, "US 2 MP 64 Stevens Pass Summit", "http://images.wsdot.wa.gov/us2/stevens/sumteast.jpg", 47.7513, -121.10619, 0, "US 2", 0)); cameraItems.add(new CameraItem(8063, "US 2 MP 65 Stevens Pass Ski Lodge", "http://images.wsdot.wa.gov/us2/stvldg/sumtwest.jpg", 47.7513, -121.10619, 0, "US 2", 0)); cameraItems.add(new CameraItem(9145, "US 2 MP 62 Old Faithful Avalanche Zone", "http://images.wsdot.wa.gov/us2/oldfaithful/oldfaithful.jpg", 47.724431, -121.134085, 0, "US 2", 0)); clientFactory.getDbService().initCamerasTable(cameraItems, new RowIdListCallback() { @Override public void onFailure(DataServiceException error) { } @Override public void onSuccess(List<Integer> rowIds) { } }); } private void createPhoneDisplay(ClientFactory clientFactory) { AnimationWidget display = new AnimationWidget(); PhoneActivityMapper appActivityMapper = new PhoneActivityMapper(clientFactory); PhoneAnimationMapper appAnimationMapper = new PhoneAnimationMapper(); AnimatingActivityManager activityManager = new AnimatingActivityManager(appActivityMapper, appAnimationMapper, clientFactory.getEventBus()); activityManager.setDisplay(display); RootPanel.get("main").add(display); clientFactory.getAccessibility().postScreenChangeNotification(); } private void loadMapApi() { boolean sensor = true; // load all the libs for use ArrayList<LoadLibrary> loadLibraries = new ArrayList<LoadApi.LoadLibrary>(); //loadLibraries.add(LoadLibrary.ADSENSE); //loadLibraries.add(LoadLibrary.DRAWING); //loadLibraries.add(LoadLibrary.GEOMETRY); //loadLibraries.add(LoadLibrary.PANORAMIO); //loadLibraries.add(LoadLibrary.PLACES); Runnable onLoad = new Runnable() { public void run() { start(); } }; LoadApi.go(onLoad, loadLibraries, sensor, Consts.MAPS_API_KEY); } @Override public void onModuleLoad() { if (!Database.isSupported()) { Window.alert("HTML 5 Database is NOT supported in this browser!"); return; } GWT.setUncaughtExceptionHandler(new UncaughtExceptionHandler() { @Override public void onUncaughtException(Throwable e) { // TODO put in my own meaninful handler Window.alert("uncaught: " + e.getMessage()); e.printStackTrace(); } }); new Timer() { @Override public void run() { loadMapApi(); } }.schedule(1); } }