問題描述

我正在嘗試實現(xiàn)一個全局加載對話框...我想調(diào)用一些靜態(tài)函數(shù)來顯示對話框和一些靜態(tài)函數(shù)來關(guān)閉它.同時我在主線程或子線程中做一些工作......

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...

我嘗試關(guān)注，但對話框沒有更新...最后一次，在再次隱藏之前，它會更新...

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;
}

推薦答案

如果沒有動畫，說明你正在事件調(diào)度線程中工作，同時顯示加載幀.這個后臺工作應(yīng)該在另一個線程中完成.

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.

這是一個無效的示例:

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) {
                }
            }
        }
    );
}

這是一個工作示例:

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

附注:實例化、填充和使加載框架可見的代碼應(yīng)包裝在 SwingUtilities.invokeLater() 中，因為它必須在 EDT 中運行.

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.

這篇關(guān)于Java - 全局的、可重用的加載對話框的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！