使用GMapsFX和FXML时，如何初始化Google Maps API密钥

Question

我正在尝试设置一个使用GMapsFX的JavaFX项目。我已经让它在不使用FXML的情况下工作了，我刚刚在start((方法中初始化了GoogleMapView变量。因此，我还认为我的API密钥不是问题所在。然而，当使用FXML时，我真的不确定在哪里初始化它。我得到的只是："仅供开发人员使用"或一个空白页。原因可能是FXML在FXML控制器中的initialize()方法之前加载吗？

这是我的控制器：

public class MapSceneController implements Initializable, MapComponentInitializedListener {
//I have tried to initialize it here
@FXML
private GoogleMapView mapView = new GoogleMapView(Locale.getDefault().getLanguage(), "AIzaSyAaCPNXgEw5zlJTHLr0MYOmvxOcQ50vLdw");
@FXML
private TextField addressTextField;
private GoogleMap map;
private GeocodingService geocodingService;
private StringProperty address = new SimpleStringProperty();
@Override
public void mapInitialized() {
//And here
//mapView = new GoogleMapView(Locale.getDefault().getLanguage(), "AIzaSyAaCPNXgEw5zlJTHLr0MYOmvxOcQ50vLdw");
geocodingService = new GeocodingService();
MapOptions mapOptions = new MapOptions();
mapOptions.center(new LatLong(47.6097, -122.3331))
.mapType(MapTypeIdEnum.ROADMAP)
.overviewMapControl(false)
.panControl(false)
.rotateControl(false)
.scaleControl(false)
.streetViewControl(false)
.zoomControl(false)
.zoom(12);
map = mapView.createMap(mapOptions);
}
@Override
public void initialize(URL location, ResourceBundle resources) {
//And here
//mapView = new GoogleMapView(Locale.getDefault().getLanguage(), "AIzaSyAaCPNXgEw5zlJTHLr0MYOmvxOcQ50vLdw");
mapView.addMapInitializedListener(this);
address.bind(addressTextField.textProperty());
}
@FXML
public void addressTextFieldAction(ActionEvent event) {
geocodingService.geocode(address.get(), (GeocodingResult[] results, GeocoderStatus status) -> {
LatLong latLong = null;
if( status == GeocoderStatus.ZERO_RESULTS) {
Alert alert = new Alert(Alert.AlertType.ERROR, "No matching address found");
alert.show();
return;
} else if( results.length > 1 ) {
Alert alert = new Alert(Alert.AlertType.WARNING, "Multiple results found, showing the first one.");
alert.show();
latLong = new LatLong(results[0].getGeometry().getLocation().getLatitude(), results[0].getGeometry().getLocation().getLongitude());
} else {
latLong = new LatLong(results[0].getGeometry().getLocation().getLatitude(), results[0].getGeometry().getLocation().getLongitude());
}
map.setCenter(latLong);
});
}
}

这是我的FXML:

<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import com.lynden.gmapsfx.GoogleMapView?>
<AnchorPane id="AnchorPane" prefHeight="600" prefWidth="1066" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.65" fx:controller="sample.JavaFX.MapScene.MapSceneController">
<children>
<GoogleMapView fx:id="mapView" prefHeight="600.0" prefWidth="1066.0" AnchorPane.bottomAnchor="0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0" AnchorPane.topAnchor="0.0"/>
<TextField fx:id="addressTextField" onAction="#addressTextFieldAction" prefHeight="27.0" prefWidth="274.0" promptText="Address" AnchorPane.leftAnchor="10" AnchorPane.topAnchor="10" />
</children>
</AnchorPane>

提前感谢！：(

Answer 1

您的代码中存在几个问题。我不知道GMapsFX的API，但如果构造函数GoogleMapView是设置密钥的唯一方法，那么我会提出以下建议。在FXML文件中，只定义要放置地图视图的容器。然后在initialize方法(在FXML部分实例化后自动调用(中手动创建映射视图并将其添加到容器中。删除所有其他初始化，因为它们不起作用。