setBackground是未修饰的JFrame

Question

Okay.. I'm rewriting this question..

I've found out that setUndecorated() was not the problem.

The problem was setBackground(new Color(0, 0, 0, 0)

After some tries, the the CardLayout was showing the right result

when the alpha channel of the background was 1 (fully opaque).

And else it was showing the wrong result.

public SmartPhone() {
    super("SmartPhone");

    setUndecorated(true); 
    setBackground(new Color(1f, 1f, 1f, .5f));

    setSize(FRAME_WIDTH, FRAME_HEIGHT);
    init(); start();

    device = this;
}

This is my constructor. init() is method creating the layout and start() is the method adding MouseAdapter .

Is there anything wrong with my setBackground() ?

Answer 1

When switching between components in a CardLayout , use the CardLayout.show() method, don't use setVisible() directly. Like this:

CardLayout cardLayout = new CardLayout();
JPanel cardPanel = new JPanel(cardLayout);
String oneStr = "One";
String twoStr = "Two";
JLabel oneLabel = new JLabel(oneStr);
JLabel twoLabel = new JLabel(twoStr);
cardPanel.add(oneLabel, oneStr);
cardPanel.add(twoLabel, twoStr);

cardLayout.show(cardPanel, oneStr);//sets "One" visible
cardLayout.show(cardPanel, twoStr);//sets "Two" visible

See here: http://docs.oracle.com/javase/tutorial/uiswing/layout/card.html

Answer 2

Um... Solved..?

I don't know what I did, but after doing some other project,

Components were printed well..!