以文本方式編程創建SplashScreen的最佳示例

Question

我需要以編程方式創建SplashScreen並向其添加文本（並對其進行更改）。 大多數示例都使用命令行參數。 有沒有解決方案工作？

Answer 1

在加載SwingWorker中的東西時，可以使用帶有背景圖像和進度條的未修飾對話框。完成後，隱藏對話框並像往常一樣啓動UI。添加到dialog/splashcreen的組件必須是非透明的，才能「看見」背景圖像。

這裏是一個工作示例：

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Frame; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.util.List; 

import javax.swing.BorderFactory; 
import javax.swing.ImageIcon; 
import javax.swing.JDialog; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JProgressBar; 
import javax.swing.SwingUtilities; 
import javax.swing.SwingWorker; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 

public class TestSplashScreen { 

    private JDialog dialog; 
    private JFrame frame; 
    private JProgressBar progress; 

    protected void initUI() throws MalformedURLException { 
     showSplashScreen(); 
     SwingWorker<Void, Integer> worker = new SwingWorker<Void, Integer>() { 

      @Override 
      protected Void doInBackground() throws Exception { 
       for (int i = 0; i < 100; i++) { 
        Thread.sleep(100);// Simulate loading 
        publish(i);// Notify progress 
       } 
       return null; 
      } 

      @Override 
      protected void process(List<Integer> chunks) { 
       progress.setValue(chunks.get(chunks.size() - 1)); 
      } 

      @Override 
      protected void done() { 
       showFrame(); 
       hideSplashScreen(); 
      } 

     }; 
     worker.execute(); 
    } 

    protected void hideSplashScreen() { 
     dialog.setVisible(false); 
     dialog.dispose(); 
    } 

    protected void showSplashScreen() throws MalformedURLException { 
     dialog = new JDialog((Frame) null); 
     dialog.setModal(false); 
     dialog.setUndecorated(true); 
     JLabel background = new JLabel(new ImageIcon(new URL("http://blogs.dirteam.com/photos/sanderberkouwer/images/2157/original.aspx"))); 
     background.setLayout(new BorderLayout()); 
     dialog.add(background); 
     JLabel text = new JLabel("Loading, please wait..."); 
     text.setForeground(Color.WHITE); 
     text.setBorder(BorderFactory.createEmptyBorder(100, 50, 100, 50)); 
     background.add(text); 
     progress = new JProgressBar(); 
     background.add(progress, BorderLayout.SOUTH); 
     dialog.pack(); 
     dialog.setLocationRelativeTo(null); 
     dialog.setVisible(true); 
    } 

    protected void showFrame() { 
     frame = new JFrame(TestSplashScreen.class.getSimpleName()); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     JLabel ui = new JLabel("UI loaded and ready"); 
     ui.setBorder(BorderFactory.createEmptyBorder(300, 300, 300, 300)); 
     frame.add(ui); 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, 
      UnsupportedLookAndFeelException { 
     UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       try { 
        new TestSplashScreen().initUI(); 
       } catch (MalformedURLException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } 
     }); 
    } 
} 

Answer 2

一種替代方法是使用SplashScreen API。詳情請參閱How to Create a Splash Screen。

我需要以編程方式創建一個閃屏和文本添加到它（和修改）。

請致電SplashScreen.createGraphics()並根據需要塗漆。