image - 在JavaFX中按下按钮时如何显示图像
问题描述
我无法弄清楚按下按钮时如何显示图像。这是我到目前为止所拥有的:
公共类标志扩展应用程序{
@Override
public void start(Stage primaryStage) {
//Create a label to display a prompt
Label promptLabel = new Label("Select Button to Display a Flag");
//Create buttons to display the flags
Button americanButton = new Button("American Flag");
Button canadianButton = new Button("Canadian Flag");
Button frenchButton = new Button("French Flag");
Button germanButton = new Button("German Flag");
Button mexicanButton = new Button("Mexican Flag");
//Creating an HBox
HBox hbox = new HBox(10, promptLabel);
HBox hbox1 = new HBox(10, americanButton);
HBox hbox2 = new HBox(10, canadianButton);
HBox hbox3 = new HBox(10, frenchButton);
HBox hbox4 = new HBox(10, germanButton);
HBox hbox5 = new HBox(10, mexicanButton);
americanButton.setOnAction(new AmericanButtonHandler());
//Creating a VBox
VBox vbox = new VBox(10, hbox, hbox1, hbox2, hbox3, hbox4, hbox5);
//set vbox padding
vbox.setPadding(new Insets(10));
//set vbox alignment
hbox.setAlignment(Pos.CENTER);
//gridpane.setAlignment(Pos.CENTER);
hbox1.setAlignment(Pos.CENTER);
hbox2.setAlignment(Pos.CENTER);
hbox3.setAlignment(Pos.CENTER);
hbox4.setAlignment(Pos.CENTER);
hbox5.setAlignment(Pos.CENTER);
//Create a scene
Scene scene = new Scene(vbox);
primaryStage.setTitle("Flags");
primaryStage.setScene(scene);
primaryStage.show();
}
class AmericanButtonHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent event){
Pane aPane = new HBox(10);
//Create new image
Image americanImage = new Image("file:America.png");
//Create new imageView
ImageView aImageView = new ImageView(americanImage);
aImageView.setImage(americanImage);
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
所以我想要发生的是,当按下美国按钮时,会调用事件处理程序以显示图像。我已经到了这一点,似乎无法通过它。有人帮忙!
解决方案
我会尝试类似底部功能的东西(注意:我根据自己的喜好修改了一些代码,它不会影响你的任何东西,这只是我喜欢看它的方式)我看到你没有创建场景舞台或展示舞台如果你看一下底部函数,它应该能让你很好地了解你应该做什么,我唯一传递的是文件路径,所以它应该很容易实现和理解
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
//Create a label to display a prompt
Label promptLabel = new Label("Select Button to Display a Flag");
//Create buttons to display the flags
Button americanButton = new Button("American Flag");
americanButton.setOnAction(event -> {
showFlagAction(getClass().getResource("/TestImage.png").toExternalForm());
});
Button canadianButton = new Button("Canadian Flag");
Button frenchButton = new Button("French Flag");
Button germanButton = new Button("German Flag");
Button mexicanButton = new Button("Mexican Flag");
//Creating an HBox
HBox hbox = new HBox(10, promptLabel);
hbox.setAlignment(Pos.CENTER);
HBox hbox1 = new HBox(10, americanButton);
hbox1.setAlignment(Pos.CENTER);
HBox hbox2 = new HBox(10, canadianButton);
hbox2.setAlignment(Pos.CENTER);
HBox hbox3 = new HBox(10, frenchButton);
hbox3.setAlignment(Pos.CENTER);
HBox hbox4 = new HBox(10, germanButton);
hbox4.setAlignment(Pos.CENTER);
HBox hbox5 = new HBox(10, mexicanButton);
hbox5.setAlignment(Pos.CENTER);
//Creating a VBox
VBox vbox = new VBox(10, hbox, hbox1, hbox2, hbox3, hbox4, hbox5);
vbox.setPadding(new Insets(10));
primaryStage.setTitle("Flags");
primaryStage.setScene(new Scene(vbox));
primaryStage.show();
}
private void showFlagAction(String filePath){
ImageView imageView = new ImageView(new Image(filePath));
VBox vBox = new VBox();
vBox.setAlignment(Pos.CENTER);
vBox.getChildren().add(imageView);
Stage stage = new Stage();
stage.setScene(new Scene(vBox));
stage.show();
}
}