将Google Maps嵌入JavaFX 2.2桌面应用程序中引发异常并且通常不会执行 [英] embedding Google Maps in a JavaFX 2.2 desktop application throwing exception and generaly not performing
问题描述
我有一个需要将Google地图嵌入到桌面Java应用程序中的项目。经过一些研究，我发现Java FX确实提供了这种功能，并开始编写一个示例应用程序作为PoC。该应用程序工作，一切都很好。
升级到新的7u7 java版本后，我的代码不再像以前那样工作。
代码运行并显示网页，但没有手势（paning / zooming）事件被触发到网页（谷歌地图），并由于某种原因，当我clikc和拖动（好像平移）我得到附带的例外，我可以没有任何意义。
我非常感谢在JavaFX 2.2应用程序中嵌入Google地图时可能有的任何见解。
预先感谢您的任何帮助和/或建议
以下是我的应用程序代码/ HTML代码和引发的异常：
JavaFX代码：
私人场景场景;
私人MyBrowser myBrowser;
私人LocationClickHandler处理程序;
私人矢量<按钮>纽扣;
//私人版主版主;
/ **
* @param args命令行参数
* /
public static void main（String [] args ）{
launch（args）;
}
@Override
public void start（Stage primaryStage）{
buttons = new Vector< Button>（）;
// moderator = new Moderator（）;
handler = new LocationClickHandler（）;
primaryStage.setTitle（java-buddy.blogspot.com）;
myBrowser = new MyBrowser（）;
//moderator.registerAddIconListener（myBrowser）;
VBox mainbox = new VBox（）;
mainbox.getChildren（）。add（myBrowser）;
// mainbox.getChildren（）。add（generateEntitiesButtonBox（））;
// mainbox.getChildren（）。add（generateSensorsButtonBox（））;
scene = new Scene（mainbox，1280，760）;
primaryStage.setScene（scene）;
primaryStage.show（）;
}
class MyBrowser扩展区域{
HBox工具栏;
WebView webView =新的WebView（）;
WebEngine webEngine = webView.getEngine（）;
public MyBrowser（）{
webView.setMinSize（1280，400）;
最终网址urlGoogleMaps = getClass（）。getResource（googlemaps2.html）;
webEngine.load（urlGoogleMaps.toExternalForm（））;
getChildren（）。add（webView）;
/*webEngine.getLoadWorker（）。stateProperty（）。addListener（
new ChangeListener< State>（）{
@Override public void changed（ObservableValue<？extends State> ov，State oldState ，state newState）{
if（newState == State.SUCCEEDED）{
JSObject win =（JSObject）webEngine.executeScript（window）;
win.setMember（java，处理程序）;
}
}
}）; * /
}
将HTML加载到Web视图中：
<！DOCTYPE html>
< html>
< head>
< title> Java-Buddy：Google Maps< / title>
< script src =http://maps.google.com/maps/api/js?sensor=false>< / script>
< style> #mapcanvas {height：500px;宽度：100％}< / style>
< script type =text / javascript>
var map;
var icon =图标/ Tank.png;
var last_clicked;
var elliptical = 0;
var sensors = new Array（）;
var sensors_to_targets = new Array（）;
var targets = new Array（）;
var target_paths = new Array（）;
var target_polys = new Array（）;
var counter = 0;
// var marker;
函数loadmap（）{
var options = {
zoom：16，
center：new google.maps.LatLng（51.507222，-0.1275 ），
mapTypeId：google.maps.MapTypeId.SATELLITE，
streetViewControl：false
}
map = new google.maps.Map（document.getElementById（mapcanvas），选项）;
google.maps.event.trigger（地图，'resize'）;
google.maps.event.addListener（map，'click'，function（event）{
java.saveLocation（event.latLng.lat（），event.latLng.lng（） ）;
}）;
}
< / script>
< / head>
< body onload =loadmap（）>
< div id =mapcanvas>< / div>
< / body>
< / html>
在Web视图中拖动时引发异常：
java.lang.NullPointerException：Clipboard.putContent：null data
at com.sun.javafx.tk.quantum.QuantumClipboard.putContent（QuantumClipboard.java:442）
at javafx.scene.input.Clipboard.setContent（Clipboard.java:226）
at com.sun.webpane.sg.UIClientImpl.confirmStartDrag（UIClientImpl.java:178）
at com。 sun.webpane.platform.WebPage.confirmStartDrag（WebPage.java:861）
at javafx.scene.web.WebView $ 19.handle（WebView.java:1204）
at javafx.scene.web.WebView $ 19.handle（WebView.java:1201）
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent（CompositeEventHandler.java:69）
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（ EventHandlerManager.java:217）
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent（EventHandlerManager.java:170）
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent（Composit eEventDispatcher.java:38）
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:37）
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java： 92）
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent（BasicEventDispatcher.java:35）
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent（EventDispatchChainImpl.java:92）
at com.sun.javafx.event.EventUtil.fireEventImpl（EventUtil.java:53）
at com.sun.javafx.event.EventUtil.fireEvent（EventUtil.java:33）
at javafx .event.Event.fireEvent（Event.java:171）
at javafx.scene.Scene $ DnDGesture.fireEvent（Scene.java:2627）
at javafx.scene.Scene $ DnDGesture.process（Scene .java：2706）
在javafx.scene.Scene $ DnDGesture.access $ 8700（Scene.java:2603）
在javafx.scene.Scene $ MouseHandler.process（Scene.java:3340）
at javafx.scene.Scene $ MouseHandler.process（Scene.java:3164）
at javafx.scene.Scene $ MouseHandler.access $ 1900（Scene.java:3119）
在javafx.scene.Scene.impl_processMouseEvent（Scene.java:1559）
在javafx.scene.Scene $ ScenePeerListener.mouseEvent（Scene.java:2261）
在com.sun.javafx.tk。 quantum.GlassViewEventHandler.handleMouseEvent（GlassViewEventHandler.java:228）
at com.sun.glass.ui.View.handleMouseEvent（View.java:528）
at com.sun.glass.ui.View。 notifyMouse（View.java:922）
at com.sun.glass.ui.win.WinApplication._runLoop（Native Method）
at com.sun.glass.ui.win.WinApplication.access $ 100（ WinApplication.java:29）
at com.sun.glass.ui.win.WinApplication $ 3 $ 1.run（WinApplication.java:73）
at java.lang.Thread.run（Unknown Source）
基于Sergey链接的问题，此问题是由于 Google Maps v3 api ，并且是在浏览器中启用触摸事件的结果（平移不适用于Google Maps v3在Chrome中使用触摸事件启用api）。
JavaFX 2.0.x（和2.1.x）webview没有实现触摸事件，但是JavaFX 2.2确实存在，因此两者之间的行为差异的原因之一。
作为解决方案，您可以使用 v2的谷歌地图api ，它不包含这个bug（至少在该版本的api在2013年5月19日离线）。或者您可以使用JavaFX 2.1，直到JavaFX团队和Google实施修复/解决方法。或者您可以继续寻求其他解决方法，例如Sergey提出的解决方案或其中的变体，这些解决方案适用于您。
I have a project requiring the embedding of google maps in a desktop java application. I found after some research that Java FX does provide this functionality and proceeded to write a sample application as a PoC. the application worked and everything was fine. After upgrading to the new 7u7 java version, my code no longer works like it did before. The code runs and displays the web page, but no gesture (paning/ zooming) events are fired to the web page (google maps) and for some reason when i clikc and drag (as if to pan) i get the enclosed exception which i can make no sense of.
I would very much appreciate any insight someone might have in the emmbedding of Google Maps in a JavaFX 2.2 application. Thank you in advance for any help and/or suggestions
Following is my application code/HTML code and the exception thrown:
JavaFX code:
private Scene scene;
private MyBrowser myBrowser;
private LocationClickHandler handler;
private Vector<Button> buttons;
//private Moderator moderator;
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
buttons = new Vector<Button>();
//moderator = new Moderator();
handler=new LocationClickHandler();
primaryStage.setTitle("java-buddy.blogspot.com");
myBrowser = new MyBrowser();
//moderator.registerAddIconListener(myBrowser);
VBox mainbox = new VBox();
mainbox.getChildren().add(myBrowser);
// mainbox.getChildren().add(generateEntitiesButtonBox());
// mainbox.getChildren().add(generateSensorsButtonBox());
scene = new Scene(mainbox, 1280, 760);
primaryStage.setScene(scene);
primaryStage.show();
}
class MyBrowser extends Region {
HBox toolbar;
WebView webView = new WebView();
WebEngine webEngine = webView.getEngine();
public MyBrowser(){
webView.setMinSize(1280, 400);
final URL urlGoogleMaps = getClass().getResource("googlemaps2.html");
webEngine.load(urlGoogleMaps.toExternalForm());
getChildren().add(webView);
/*webEngine.getLoadWorker().stateProperty().addListener(
new ChangeListener<State>() {
@Override public void changed(ObservableValue<? extends State> ov, State oldState, State newState) {
if (newState == State.SUCCEEDED) {
JSObject win = (JSObject) webEngine.executeScript("window");
win.setMember("java", handler);
}
}
});*/
}
HTML loaded into the Web View:
<!DOCTYPE html>
<html>
<head>
<title>Java-Buddy: Google Maps</title>
<script src="http://maps.google.com/maps/api/js?sensor=false"></script>
<style>#mapcanvas { height: 500px; width: 100%}</style>
<script type="text/javascript">
var map;
var icon="icons/Tank.png";
var last_clicked;
var elliptical=0;
var sensors = new Array();
var sensors_to_targets = new Array();
var targets = new Array();
var target_paths = new Array();
var target_polys = new Array();
var counter =0;
//var marker;
function loadmap(){
var options = {
zoom: 16,
center: new google.maps.LatLng(51.507222, -0.1275),
mapTypeId: google.maps.MapTypeId.SATELLITE,
streetViewControl: false
}
map = new google.maps.Map(document.getElementById("mapcanvas"), options);
google.maps.event.trigger(map,'resize');
google.maps.event.addListener(map, 'click', function(event) {
java.saveLocation(event.latLng.lat(),event.latLng.lng());
});
}
</script>
</head>
<body onload="loadmap()">
<div id="mapcanvas"></div>
</body>
</html>
exception thrown when dragging in the web view:
java.lang.NullPointerException: Clipboard.putContent: null data
at com.sun.javafx.tk.quantum.QuantumClipboard.putContent(QuantumClipboard.java:442)
at javafx.scene.input.Clipboard.setContent(Clipboard.java:226)
at com.sun.webpane.sg.UIClientImpl.confirmStartDrag(UIClientImpl.java:178)
at com.sun.webpane.platform.WebPage.confirmStartDrag(WebPage.java:861)
at javafx.scene.web.WebView$19.handle(WebView.java:1204)
at javafx.scene.web.WebView$19.handle(WebView.java:1201)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Scene$DnDGesture.fireEvent(Scene.java:2627)
at javafx.scene.Scene$DnDGesture.process(Scene.java:2706)
at javafx.scene.Scene$DnDGesture.access$8700(Scene.java:2603)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3340)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3164)
at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3119)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1559)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2261)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:228)
at com.sun.glass.ui.View.handleMouseEvent(View.java:528)
at com.sun.glass.ui.View.notifyMouse(View.java:922)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
at java.lang.Thread.run(Unknown Source)
Based on the issue Sergey linked, it seems one part of this issue is caused by an error in Google Maps v3 api and is a result of enabling touch events in the browser (panning doesn't work with Google Maps v3 api in Chrome with touch events enabled either).
JavaFX 2.0.x (and 2.1.x) webview did not have touch events implemented, but JavaFX 2.2 does, hence one reason for the difference in behaviour between the two.
As a work around you could use v2 of the google maps api which don't feature this bug (well at least until that version of the api goes offline on May 19, 2013). Or you can use JavaFX 2.1 until the JavaFX team and Google implement a fix/workaround. Or you can continue seeking other workarounds such as that suggested by Sergey or variation thereof which works for you.
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