Mobile Java with MGWT, "Still Write Once Run Everywhere"
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Mobile Java with MGWT, "Still Write Once Run Everywhere"



Updated Mobile Java with MGWT, "Still Write Once Run Everywhere" talk from GWT Create US

Updated Mobile Java with MGWT, "Still Write Once Run Everywhere" talk from GWT Create US



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Mobile Java with MGWT, "Still Write Once Run Everywhere" Mobile Java with MGWT, "Still Write Once Run Everywhere" Presentation Transcript

  • Mobile Java with GWT Still “Write Once Run Everywhere” Murat Yener @yenerm
  • who am I?!? • Java, Flex, GWT, iOS, Android Developer • Android Developer at Intel • Eclipse Committer (libra anyone?) • GDG Istanbul Organizer • Conference Speaker
  • my history: iOS
  • java was everywhere… • Java EE • Web • Java SE • Java ME • on Windows, Mac, Linux, Symbian…
  • literally everywhere!!
  • android to rescue • Activities • Services • Widgets • Intents but still what about iOS??
  • the fifth element, the WebView • HTML5 frameworks • Phonegap • Native (like) UX
  • come on HTML5 on mobile? • Facebook killed the HTML5 app, Zuckerberg said HTML5 is not there yet… ! • try fastbook from Sencha LinkedIn moved to native and it took ages to fix the native app…
  • Hybrid Apps: Teaching the old dog new tricks?
  • html5 apps in native shell?? nuts!! this is too complicated!!
  • really?!? • have many of you have web development experience? • how many of you develop native apps? • how many of you don’t like web development just because of javascript??
  • but it is slow… • building games? • 3d physics? • image or sound processing? • ... no most of the time we just do this!
  • so this is web?!? • Angry Birds for Chrome (GWT) • Quake on Mobile (requires Chrome Beta for WebGL) “We started with the existing Jake2 Java port of the Quake II engine, then used the Google Web Toolkit (along with WebGL, WebSockets, and a lot of refactoring) to cross-compile it into Javascript. You can see the results in the video above — we were honestly a bit surprised when we saw it pushing over 30 frames per second on our laptops (your mileage may vary)!” from Google Code Blog...
  • Chromium WebView
  • Mobile (friendly) HTML5 Frameworks • jQueryMobile • Sencha • Zepto • …
  • Hey wait, I am a GWT dev • GWT compiler does the magic • Optimized high performance javascript • cross browser compability (upto ie6) • not really mobile look’n feel :(
  • UI & UX
  • GWT to Mobile • gwt-mobile-webkit: database, storage, geolocation, widgets(?) • gwtmobile: GwtMobile-UI, GwtmobilePersistence, GwtMobile-PhoneGap(!) • touch4j: Sencha, • mgwt: UI Widgets, GWT-Phonegap
  • meet MGWT • mobile widget library on gwt • native looking widgets for each platform • maven friendly • mvp ready (maven archetype) • and with gwt-phonegap
  • how to start? • get the source • or download the jar • or just use maven <dependency> <groupId>com.googlecode.mgwt</groupId> <artifactId>mgwt</artifactId> <version>1.1.2</version> </dependency>
  • hello world! public class MGWTEntryPoint implements EntryPoint { ! public void onModuleLoad() { // set viewport and other settings for mobile MGWT.applySettings(MGWTSettings.getAppSetting()); ! // build animation helper and attach it AnimationHelper animationHelper = new AnimationHelper(); RootPanel.get().add(animationHelper); ! // build some UI LayoutPanel layoutPanel = new LayoutPanel(); Button button = new Button("Hello mgwt"); layoutPanel.add(button); ! // animate animationHelper.goTo(layoutPanel, Animation.SLIDE); } }
  • other libraries • Google Maps Ver 2.0: • Google Maps Ver 3.0: • No Javascript so far! <inherits name='' />
  • add a litte spice: phonegap • geolocation • camera • accelerator • compass • phonebook • file system • even nfc ly al ic as b ny a ve ti na !! PI A
  • phonegap in action ... Button button = new Button("Hello mgwt"); button().addTapHandler(new TapHandler() { @Override public void onTap(TapEvent event) { phoneGap.getNotification().alert("Done!!"); } }); layoutPanel.add(button); ...
  • phonegap, in real action phoneGap.getGeolocation().watchPosition(geolocationOptions, new MyGeolocationCallback(){ @Override public void onSuccess(Position position) { // check accuracy if (position.getCoordinates().getAccuracy() > 11) { raceView.getLabel().setText("Error: Accuracy"); } // geolocation returns mps, multiply with 3.6 to convert to kph double speed = 3.6 * position.getCoordinates().getSpeed(); if (speed > 0.2) {// if going raceView.getLabel().setText(speed + "km @" + position.getCoordinates().getAccuracy()); currentLocation = position;
 // got the position now can start!
 start(); // stop if the threshold is reached if (isGoing && speed >= 60) { MgwtAppEntryPoint.phoneGap.getGeolocation().clearWatch(geolocationWatcher); endLocation = position;
 calculate(); } } else {// if stoped raceView.getLabel().setText("get ready!!"); isGoing = false; } } @Override public void onFailure(PositionError error) { MgwtAppEntryPoint.phoneGap.getNotification().alert("Problem getting location"); } });
  • even more… public void onTap(TapEvent event) { final MCheckBox check = ((MCheckBox) event.getSource()); if (check.getValue()) { if (TWITTER.equalsIgnoreCase(type)) profileView.getBrowser().showWebPage(Service.BASE_URL + "auth/twitter"); else if (FACEBOOK.equalsIgnoreCase(type)) profileView.getBrowser().showWebPage(Service.BASE_URL + "auth/facebook"); profileView.getBrowser().addLocationChangeHandler(new ChildBrowserLocationChangedHandler() { @Override public void onLocationChanged(ChildBrowserLocationChangedEvent event) { //Do the login... } }); } } } ph the of use ake m g ap ne o ins! lug p
  • going fancy, mvp! • code your UI in the View preferably in xml via UIBinder • and your logic in the controller (activity) • sound familiar? • easy navigation • lots of boilerplate code
  • mvp in mgwt • MVP • • View • • Model Presenter Maven Archetype
  • connecting to backend • GWT-RPC (yeah, it rocks), but in native package? • JSONP with with RequestBuilder & Autobean JsonpRequestBuilder jsonp = new JsonpRequestBuilder();
 String url = URL.encode(JSON_URL + "/sendData/" + “HelloWorld”); jsonp.requestObject(url, new AsyncCallback<JavaScriptObject>() { @Override public void onFailure(Throwable caught) { MgwtAppEntryPoint.phoneGap.getNotification().alert(caught.getMessage()); } @Override public void onSuccess(JavaScriptObject result) {
 JSONObject jsObj = new JSONObject(result);
 AutoBean<Score[]> bean = AutoBeanCodex.decode(factory, Score[].class, jsObj.toString()); Score[] scores =; scoresCallback.onResponse(scores); } });
  • re-using javascript • can use any existing javascript • use javascript in type safe way • BUT!! don’t mess touch events!! • AND beware you are not in the safe and optimized zone anymore!!
  • basic JSNI public native static String key(int index) /*-{ return $wnd.localStorage.key(index); }-*/;
 public native static void setItem(String key, String value) /*-{ $wnd.localStorage.setItem(key, value); }-*/; public native static String getItem(String key) /*-{ return $wnd.localStorage.getItem(key); }-*/; public native static void removeItem(String key) /*-{ $wnd.localStorage.removeItem(key); }-*/; public native static void clear() /*-{ $wnd.localStorage.clear(); }-*/;
  • building my swipe panel • just like the one in sencha • so wrapped swipeview from cubiq
  • mgwt groups!forum/mgwt
  • daniel to rescue..
  • and just before a talk..
  • gquery public void onModuleLoad() { //Hide the text and set the width and append an h1 element $("#text").hide() .css("width", "400px") .prepend("<h1>GwtQuery Rocks !</h1>"); //add a click handler on the button $("button").click(new Function(){ public void f() { //display the text with effects and animate its background color $("#text").as(Effects) .clipDown() .animate("backgroundColor: 'yellow'", 500) .delay(1000) .animate("backgroundColor: '#fff'", 1500); } }); }
  • skinning • default themes for • • iOS/iOS retina (<7.0) • • Android (>4.0) Blackberry easy to create yours //append your own css as last thing in the head MGWTStyle.injectStyleSheet("yourcssfile.css");
  • wait, css in java?!? .mgwt-Button { display: inline-block; float: left; width: 145px; height: 100px; border: 1px solid rgba(0,0,0,0.23); background: #ff6600; border-radius: 6px; box-shadow: inset -1px 0px 0px rgba(255,255,255,0.41), inset 1px 0px 0px rgba(255,255,255,0.21), inset 0px -1px 0px rgba(0,0,0,0.21), inset 0px 1px 0px rgba(255,255,255,0.41), 0px 1px 2px rgba(0,0,0,0.21); text-align: center; font-size: 14px; margin: 5px; font-weight: bold; text-shadow: 0px 1px 1px rgba(0,0,0,0.49); color: white; line-height: 124px; }
  • debugging • first class java debugging in your IDE • GWT pretty compile and debug javascript in your browser • use source maps and debug java in your browser!! • use remote debugging to debug on mobile devices
  • what about others? • iOS, works like charm.. pretty much native • android, near native experience • blackberry • windows phone • tablets? • desktop??
  • what can i really build? • anything! (almost) • but why not going native for games • many widgets.. lists, carousels, forms • dev friendly, you know java? just dive in! • make use of current js • windows phone? seriously?!?
  • thanks… questions? @yenerm