问题描述

我正在尝试实现一个全局加载对话框...我想调用一些静态函数来显示对话框和一些静态函数来关闭它.同时我在主线程或子线程中做一些工作......

I'm trying to implement a global loading dialog... I want to call some static function to show the dialog and some static function to close it. In the meanwhile I'm doing some work in the main thread or in a sub thread...

我尝试关注，但对话框没有更新...最后一次，在再次隐藏之前，它会更新...

I tried following, but the dialog is not updating... Just once at the end, before hiding it again, it updates...

    private static Runnable getLoadingRunable()
{
    if (loadingRunnable != null)
    {
        loadingFrame.setLocationRelativeTo(null);
        loadingFrame.setVisible(true);  
        return loadingRunnable;
    }

    loadingFrame = new JFrame("Updating...");
    final JProgressBar progressBar = new JProgressBar();
    progressBar.setIndeterminate(true);
    final JPanel contentPane = new JPanel();
    contentPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
    contentPane.setLayout(new BorderLayout());
    contentPane.add(new JLabel("Updating..."), BorderLayout.NORTH);
    contentPane.add(progressBar, BorderLayout.CENTER);
    loadingFrame.setContentPane(contentPane);
    loadingFrame.pack();
    loadingFrame.setLocationRelativeTo(null);
    loadingFrame.setVisible(true);  

    loadingRunnable = new Runnable() {
        public void run() {

            try {
                while (running) {
                    Thread.sleep(100);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    loadingFrame.setVisible(false);
                }
            });
        }
    };
    return loadingRunnable;
}

public static void showLoadingBar() {
    System.out.println("showLoadingBar");
    running = true;

    threadLoadingBar = new Thread(getLoadingRunable());
    threadLoadingBar.start();
}

public static void hideLoadingBar() {
    System.out.println("hideLoadingBar");
    running = false;
    threadLoadingBar = null;
}

推荐答案

如果没有动画，说明你正在事件调度线程中工作，同时显示加载帧.这个后台工作应该在另一个线程中完成.

If it doesn't animate, it means that you're doing work in the event dispatch thread while the loading frame is displayed. This background work should be done in another thread.

这是一个无效的示例:

public static void main(String[] args) throws Exception {
    SwingUtilities.invokeLater(
        new Runnable() {
            @Override
            public void run() {
                try {
                    showLoadingBar();
                    Thread.sleep(10000L); // doing work in the EDT. Prevents the frame from animating
                    hideLoadingBar();
                }
                catch (InterruptedException e) {
                }
            }
        }
    );
}

这是一个工作示例:

public static void main(String[] args) throws Exception {
    showLoadingBar();
    Thread.sleep(10000L); // doing work outside of the EDT. Everything works fine
    hideLoadingBar();
}

附注:实例化、填充和使加载框架可见的代码应包装在 SwingUtilities.invokeLater() 中，因为它必须在 EDT 中运行.

Side note: the code which instantiates, populates and makes the loading frame visible should be wrapped into SwingUtilities.invokeLater(), because it must be run in the EDT.

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