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將圖像插入borderpane作為背景

[英]Insert image into borderpane as background

我想將圖像加載到BorderPane中。 我有一個靜態Java方法,這使我的工作更加復雜:

private static final Image iv;    
    static {
        iv = new Image(StartPanel.class.getClass().getResource("/images/system-help.png").toExternalForm());
    }

public static void insert(){

     bp.setCenter(iv);
}

您能告訴我如何正確加載圖像嗎?

PS我明白了

Executing com.javafx.main.Main from /home/rcbandit/Desktop/test/DX-57DC/dist/run1833589211/DX-57DC.jar using platform /opt/jdk1.7.0_25/bin/java
Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.javafx.main.Main.launchApp(Main.java:642)
    at com.javafx.main.Main.main(Main.java:805)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:403)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:47)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:115)
    at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.NullPointerException
    at com.dx57dc.stages.StartPanel.infrastructureIcon(StartPanel.java:241)
    at com.dx57dc.stages.StartPanel.navigationPanel(StartPanel.java:138)
    at com.dx57dc.stages.StartPanel.agentsPanel(StartPanel.java:78)
    at com.dx57dc.stages.Agents.agentsPanel(Agents.java:9)
    at com.dx57dc.main.DX57DC.initMainStage(DX57DC.java:287)
    at com.dx57dc.main.DX57DC.start(DX57DC.java:115)
    at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319)
    at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:215)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:176)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:176)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76)
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at com.sun.glass.ui.gtk.GtkApplication$3$1.run(GtkApplication.java:82)
    ... 1 more
Java Result: 1

PS 2我設法用以下代碼加載圖像:

    private static final ImageView iv;    
        static {
            iv = new ImageView(StartPanel.class.getResource("/com/dx57dc/images/6.jpg").toExternalForm());
        }

borderpane.setCenter(iv);

我知道了。 您甚至不需要處理圖像加載。 訣竅是使用style屬性:

borderpane.setStyle("-fx-background-image: url(\"/images/system-help.png\");-fx-background-size: 500, 500;-fx-background-repeat: no-repeat;")

當然,您應該外包css文件而不使用內聯樣式。 它更容易顯示。

如果只想設置中心區域的背景,請使用以下命令:

borderpane.getCenter().setStyle("-fx-background-image: url(\"/images/system-help.png\");-fx-background-size: 500, 500;-fx-background-repeat: no-repeat;")

注意:
system-help.png位於/images目錄中,該目錄與應用程序的類文件位於同一級別(例如,使用eclipse,它必須存儲在bin文件夾中,這意味着您添加了一個文件夾(例如,調用它的資源)添加到您的項目中,並將其用作source folder (在該文件夾中,您將需要圖像文件夾。有點奇怪,但這就是fx如何需要它)。

編輯:調整大小如下:

private static final ImageView iv;    
static {
            iv = new ImageView(StartPanel.class.getResource("/com/dx57dc/images/6.jpg").toExternalForm());
            iv.resize(100, 100);
        }

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