Java-Full screen in 16bit

Question

How can I put a Jframe in full screen and change the screen resolution using:

device.setDisplayMode(new DisplayMode(Width,Height,16,DisplayMode.REFRESH_RATE_UNKNOWN));

I must use a new library?

Thanks

Answer 1

It is very likely that your video card or your video driver can’t stand it the change, especially if your driver is generic, for example this using a newer operating system than your graphics card, for example in my case the video only provides 32bit, this may be due to board (Onboard) or because I installed Window 8.1 for an older board, which only supports Windows7.

To know which modes your system do the following way (if you use Windows):

• Right-click the Mouse/Mouse on the Desktop
• Select Screen resolution
• Click on Advanced Settings
• In the window that opened look for the button List modes

This will turn up:

Note that all "modes" only have support for 32 bits, I think using 16bits nowadays is unnecessary

From what I read, modern systems don’t need more than 16bits, or anything less than 32bits, there are techniques (which probably only programs with administrator accesses can use), one of them is to put the program to start with compatibility mode, however the process is all manual and can not do this by Java (except if it is a scam using the Windows Apis), for example:

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How to Detect Support for Changing Display with Java

To make sure it supports you can test the function:

 GraphicsDevice.isDisplayChangeSupported

And in the setDisplayMode use Try/catch:

try {
    device.setDisplayMode(displayMode);
} catch (Throwable e) {
    //Pega o erro e.getMessage
}

How to put Jframe on fullescreen

Now to leave the JFrame in fullscreen, regardless of the support of your video card and/ or driver you can use so:

frame.setExtendedState(JFrame.MAXIMIZED_BOTH); //Maxmiza
frame.setUndecorated(true); //Remove a decoração da janela

This will leave your JFrame in fullscreen, but it does not mean that it will change the screen resolution.

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It should look like this (press Alt+F4 to close):

Note: added the javax.swing.JOptionPane only to display messages to know what happened

import java.awt.DisplayMode;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class Main
{
    public static void main(String[] argv) throws Exception
    {
        final GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        final GraphicsDevice device = ge.getDefaultScreenDevice();

        final int width = 640;
        final int height = 480;

        if (device.isDisplayChangeSupported()) {
            final DisplayMode displayMode = new DisplayMode(width, height, 16, DisplayMode.REFRESH_RATE_UNKNOWN);

            try {
                device.setDisplayMode(displayMode);
                JOptionPane.showMessageDialog(null, "Mudou a resolução");
            } catch (Throwable e) {
                device.setFullScreenWindow(null);
                JOptionPane.showMessageDialog(null, e.getMessage());
            }
        } else {
            JOptionPane.showMessageDialog(null, "Sem suporte para mudar a resolução");
        }

        final JFrame frame = new JFrame("Minha primeira janela");
        frame.setExtendedState(JFrame.MAXIMIZED_BOTH); //Maxmiza
        frame.setUndecorated(true); //Remove a decoração da janela
        frame.setVisible(true);
    }
}