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我想知道点击发生时如何从谷歌地图获取坐标到 JavaFX 应用程序？这是我尝试调用 Java 函数的代码示例：

来自 JavaScript 'click' 处理程序的 'showCoordinates'：

public class JavaFXApplication extends Application {
public void showCoordinates(String coords)
{
    System.out.println("Coordinates: " + coords);
}

@Override public void start(Stage stage) 
{   
    final WebView webView = new WebView();
    final WebEngine webEngine = webView.getEngine();
    webEngine.load(getClass().getResource("googlemap.html").toString());

    webEngine.getLoadWorker().stateProperty().addListener(
            new ChangeListener<State>() {
                @Override
                public void changed(ObservableValue<? extends State> ov, State oldState,     State newState) {
                    if (newState == State.SUCCEEDED) {
                        JSObject window = (JSObject) webEngine.executeScript("window");
                        window.setMember("java", new JavaFXApplication());
                    }
                }
            });  
    BorderPane root = new BorderPane();
    root.setCenter(webView);
    stage.setTitle("Google maps");
    Scene scene = new Scene(root,1000,700, Color.web("#666970"));
    stage.setScene(scene);
    stage.show();
}

public static void main(String[] args){
    Application.launch(args);
}
}

// googlemap.html file
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <style type="text/css">
        html { height: 100% }
        body { height: 100%; margin: 0px; padding: 0px }
        #map_canvas { height: 100%; background-color: #666970; }
    </style>        
    <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false">
    </script>
    <script type="text/javascript">            
        function initialize() {
            var latlng = new google.maps.LatLng(40.75089, -73.93804);
            var myOptions = {
                zoom: 10,
                center: latlng,
                mapTypeId: google.maps.MapTypeId.ROADMAP,
                mapTypeControl: false,
                panControl: true,
                navigationControl: true,
                streetViewControl: false,
                backgroundColor: "#666970"
            };

            var map = new     google.maps.Map(document.getElementById("map_canvas"),myOptions);     
            document.map = map;

    google.maps.event.addListener(map, 'click', function(event) {
        //java.showCoordinates(event.latLng); ???
    });
    map.setCenter(location);
}       
    </script>
</head>
<body onload="initialize()">
    <div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>
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1 回答 1

1

经过一些实验，我得出了一个简单的基于计时器的解决方案。这个想法是计时器函数定期轮询 javascript 文档并解析结果。

var latlng = new google.maps.LatLng(52.3, 4.59 );
var myOptions = {
  zoom: 9,
  center: latlng,
  mapTypeId: google.maps.MapTypeId.TERRAIN,
  mapTypeControl: true,
  navigationControl: true,
  streetViewControl: true,
  backgroundColor: "#FFFFFF"
};

document.geocoder = new google.maps.Geocoder();
document.map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);

document.updateJavaFX = function updateJavaFX() {
    document.currentCenter  = document.map.getCenter();
    document.currentBounds  = document.map.getBounds();
    document.currentHeading = document.map.getHeading();
    document.currentZoom    = document.map.getZoom();
}

当调用 updateJavaFX() 函数时，文档变量（位置的 currentCenter）被填充。

在 JavaFX 代码中，以下部分（这部分在 AnimationTimer 中调用）用于检索地图的当前纬度位置。

    if ((mMapAutoUpdate.get()) && (mLastNow < pNow - 10000000)) {
    mLastNow = pNow;
    mMapView.getEngine().executeScript("document.updateJavaFX()");
    JSObject jdoc = (JSObject) mMapView.getEngine().getDocument();
    if (jdoc != null) {
        try {
            JSObject ds = (JSObject) jdoc.getMember("currentCenter");
            String cc = ds.toString().trim();
            cc = cc.substring(1, cc.length() - 1);
            String[] ccs = cc.split(",");
            double newlat = Double.parseDouble(ccs[0].trim());
            double newlon = Double.parseDouble(ccs[1].trim());
            mCenterLat.set(newlat);
            mCenterLon.set(newlon);
            int zoom = (Integer) jdoc.getMember("currentZoom");
            mZoom.set(zoom);
        } catch (ClassCastException cce) {
            String ds = (String) jdoc.getMember("currentCenter");
            String[] ccs = ds.trim().split(",");
            double newlon = Double.parseDouble(ccs[0].substring(4).trim());
            double newlat = Double.parseDouble(ccs[1].substring(4).trim());
            mCenterLat.set(newlat);
            mCenterLon.set(newlon);
            int zoom = (Integer) jdoc.getMember("currentZoom");
            mZoom.set(zoom);
        }
    }
}

我为可能的解决方案写了一篇博客文章；

http://oldguardprogrammer.blogspot.nl/2013/01/javafx-and-google-maps.html

于 2013-01-31T09:39:23.980 回答