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

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

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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 fb.html5isready.com 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) http://mediatojicode.com/q3bsp/ “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(?) http://code.google.com/p/gwt-mobile-webkit/ • gwtmobile: GwtMobile-UI, GwtmobilePersistence, GwtMobile-PhoneGap(!) http://code.google.com/p/gwtmobile/ • touch4j: Sencha, http://www.emitrom.com/gwt4touch • mgwt: UI Widgets, GWT-Phonegap http://code.google.com/p/mgwt/
    • 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 https://code.google.com/p/mgwt • 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: http://code.google.com/p/gwtgoogle-apis/ • Google Maps Ver 3.0: http://code.google.com/p/gwtgoogle-maps-v3/ • No Javascript so far! <inherits name='com.google.gwt.maps.GoogleMaps' />
    • 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 = bean.as(); 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 https://groups.google.com/forum/?fromgroups#!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 https://code.google.com/p/mgwt/wiki/Styling //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? murat@muratyener.com @yenerm devchronicles.com