java - KeyListener问题

Question

在我的应用程序中，我使用了一个 jpanel，我想在其中添加一个关键监听器。我做到了。但它不起作用。

是不是因为我在用swingworker每秒更新面板的内容。

这是我更新面板的代码

RenderedImage image = ImageIO.read(new ByteArrayInputStream((byte[]) get()));
        Graphics graphics = remote.rdpanel.getGraphics();
        if (graphics != null) {
            Image readyImage = new ImageIcon(UtilityFunctions.convertRenderedImage(image)).getImage();
            graphics.drawImage(readyImage, 0, 0, remote.rdpanel.getWidth(), remote.rdpanel.getHeight(), null);
        }

Answer 1

JPanel 是否有键盘焦点？

我建议您使用 InputMap 和 WHEN_IN_FOCUSED_WINDOW 或类似的东西。摘自How to Use Key Bindings :

The WHEN_IN_FOCUSED_WINDOW input maps of all the enabled components in the focused window are searched. Because the order of searching the components is unpredictable

这对我来说非常有效。查看我的其他帖子以获取更多信息和实际代码示例:

• Keyboard input for a game in Java

或本教程:Swing: Understanding Input/Action Maps

相关问题:

• JPanel not listening to key event when there is a child component with JButton on it