I've been trying to add an image to a JFrame but I can't seem to get it done.
I looked at online tutorials and other similar questions but nothing seems to work.
ImageIcon wiz = new ImageIcon("wizard.png");
ImageIcon assassin = new ImageIcon("assassin.png");
JFrame frame = new JFrame("Select");
frame.setBounds(50, 50,1000, 1000);
JButton w = new JButton("Wizard");
JButton a = new JButton("Assasin");
JFrame f = new JFrame("Image");
JLabel img1 = new JLabel(wiz);
frame.setLayout(null);
f.setLayout(null);
f.setIconImage(wiz.getImage());
w.setBounds(30,380,100,60);
frame.add(w);
a.setBounds(200, 380, 100, 60);
frame.add(a);
f.setVisible(true);
frame.setVisible(true);
I think the main problem in your program is that you try absolute positioning of components (e.g. JLabel) using setLayout(null) and setBounds() on components.
In Swing, the correct way to place components is by using layout managers. See this tutorial for details about how to use layout managers:
https://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html
As a sample program, I've successfully set images (both as JFrame's icon and inside JFrame's contents area) in below program. Try it and see.
This is a screenshot of my sample JFrame.
import javax.swing.*;
public class FrameWithIcon
{
public static void main(String[] args)
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Since I'm not setting a layout manager to contentPane, it's default (BorderLayout) is used
//This sets the image in JFrame's content area
f.getContentPane().add(new JLabel(new ImageIcon("star.png")));
//This sets JFrame's icon (shown in top left corner of JFrame)
f.setIconImage(new ImageIcon("star.png").getImage());
f.setBounds(300, 200, 400, 300);
f.setVisible(true);
}
}
Related
I am trying to get a JInternalFrame to appear on my screen when a button is pressed, a pop up effect basically. However when the button is pressed the JInternalFrame does not appear on the screen. Also when I resize the screen all the elements expand with it, I am wondering if there is a way to get a pop up window to appear on the screen and keep the layout manager I have now still in place so that when the window is resized the elements are also resized with it
public class testing2 implements ActionListener {
JButton buttonAppear = new JButton();
JLayeredPane LayeredPane = new JLayeredPane();
public static void main(String[] args) {
new testing2();
}
public testing2() {
LayeredPane = new JLayeredPane();
BorderLayout borderlayoutpane = new BorderLayout();
LayeredPane.setLayout(borderlayoutpane);
JPanel mainPanel = new JPanel();
BorderLayout borderlayout = new BorderLayout();
mainPanel.setLayout(borderlayout);
JButton button = new JButton("Button");
mainPanel.add(button, "Center");
buttonAppear = new JButton("Panel Appear");
buttonAppear.addActionListener(this);
mainPanel.add(buttonAppear, "South");
LayeredPane.add(mainPanel, 2);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(LayeredPane);
frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
#Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource() == buttonAppear)
{
JInternalFrame inFrame = new JInternalFrame("Internal Frame", true, true, true, true);
inFrame.setBounds(10, 10, 200, 200);
inFrame.setVisible(true);
LayeredPane.add(inFrame, 1);
}
}
}
a pop up effect basically.
Then use a JDialog. A JInternalFrame was designed to work with a JDesktopPane.
mainPanel.add(button, "Center");
Don't use hardcode strings for the constraint. Use the field provided by the API:
mainPanel.add(button, BorderLayout.CENTER);
Also, follow Java naming conventions. Variable names should NOT start with an upper case character. Be consistent.
Don't know if it will make a difference but components with a higher layer number are painted on top of components with a lower index. So I would guess the panel (which is opaque) would just paint over top of the internal frame. Read the section from the Swing tutorial on How to Use Layered Panes. Also read the section on How to Use Root Panes to find the special variable for "popups" on a layered pane.
I am trying to get a JInternalFrame to appear on my screen when a button is pressed, a pop up effect basically. However when the button is pressed the JInternalFrame does not appear on the screen. Also when I resize the screen all the elements expand with it, I am wondering if there is a way to get a pop up window to appear on the screen and keep the layout manager I have now still in place so that when the window is resized the elements are also resized with it
public class testing2 implements ActionListener {
JButton buttonAppear = new JButton();
JLayeredPane LayeredPane = new JLayeredPane();
public static void main(String[] args) {
new testing2();
}
public testing2() {
LayeredPane = new JLayeredPane();
BorderLayout borderlayoutpane = new BorderLayout();
LayeredPane.setLayout(borderlayoutpane);
JPanel mainPanel = new JPanel();
BorderLayout borderlayout = new BorderLayout();
mainPanel.setLayout(borderlayout);
JButton button = new JButton("Button");
mainPanel.add(button, "Center");
buttonAppear = new JButton("Panel Appear");
buttonAppear.addActionListener(this);
mainPanel.add(buttonAppear, "South");
LayeredPane.add(mainPanel, 2);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(LayeredPane);
frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
#Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource() == buttonAppear)
{
JInternalFrame inFrame = new JInternalFrame("Internal Frame", true, true, true, true);
inFrame.setBounds(10, 10, 200, 200);
inFrame.setVisible(true);
LayeredPane.add(inFrame, 1);
}
}
}
a pop up effect basically.
Then use a JDialog. A JInternalFrame was designed to work with a JDesktopPane.
mainPanel.add(button, "Center");
Don't use hardcode strings for the constraint. Use the field provided by the API:
mainPanel.add(button, BorderLayout.CENTER);
Also, follow Java naming conventions. Variable names should NOT start with an upper case character. Be consistent.
Don't know if it will make a difference but components with a higher layer number are painted on top of components with a lower index. So I would guess the panel (which is opaque) would just paint over top of the internal frame. Read the section from the Swing tutorial on How to Use Layered Panes. Also read the section on How to Use Root Panes to find the special variable for "popups" on a layered pane.
I want to create a Window with an image and a text so far i've got this:
public void ShowPng1() {
ImageIcon theImage = new ImageIcon("Icon_Entry_21.gif");
panel.setSize(270, 270);
JLabel label = new JLabel("Hello, World!");
JLabel imageLabel = new JLabel(theImage);
imageLabel.setOpaque(true);
panel.add(imageLabel);
panel.add(label);
panel.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel.setVisible(true);
}
My panel:
private JFrame panel = new JFrame();
For some reason it won't load nor image nor text, it just pops up as a white window. What can be the problem? I've also tried changing the format to .png, didn't work.
UPDATE
import java.awt.BorderLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Img {
private JFrame panel = new JFrame();
public Img(){
ShowPng1();
}
public void ShowPng1() {
ImageIcon theImage = new ImageIcon("Icon_Entry_21.gif");
panel.setSize(300, 300);
panel.setResizable(false);
JLabel label = new JLabel("Hello, World!");
JLabel imageLabel = new JLabel(theImage);
imageLabel.setOpaque(true);
panel.add(imageLabel);
panel.add(label, BorderLayout.PAGE_END);
panel.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel.setVisible(true);
}
public static void main(String[] args) {
new Img();
}
}
I've managed to get this working, which is ridiculous because I can't figure out how to make it work with my program. Reimeus gave me an idea on creating this script separately, the fix and that worked. I will have to look through my entire program to see if I'm missing anything. Creating it in a separate class should work as well.
it just pops up as a white window
Sounds like you're blocking the EDT on startup. You may need to use one of Swing's concurrency mechanisms to solve it. Post a Minimal, Complete, Tested and Readable example so we can determine this for sure.
In the meantime...
You're displacing the component containing the theImage component in the BorderLayout.CENTER location
panel.add(label);
You could organize your labels so that they can appear simultaneously (placing the components at 2 different BorderLayout locations will do)
panel.add(imageLabel);
panel.add(label, BorderLayout.PAGE_END);
You should make a JPanel and add it to the frame, and then add the labels to the panel
Something like
private JPanel panel = new JPanel;
and then add it to the frame in your method calling
frame.add(panel);
I've been spending some time relearning java and a peculiar logic error hit me here.
import javax.swing.*;
import java.awt.*;
class Frame
{
public static void main (String args[])
{
JFrame frame = new JFrame("Tester Frame");
frame.setSize(400, 500);
JButton btn1 = new JButton("FOO");
btn1.setSize(150, 50);
btn1.setLocation(45, 0);
JButton btn2 = new JButton("BAR");
btn2.setSize(150, 50);
btn2.setLocation(205, 0);
Container content = frame.getContentPane();
content.setBackground(Color.blue);
content.add(btn1);
content.add(btn2);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}//end main
}
I've created 2 JButton objects, and they should be the same size, with different location and text. This of course is not the case, the "FOO" button is exactly where and how I want it to be, but the "BAR" button is the size of the entire frame.
Help!
1) You are attempting to use Absolute LayoutManager via setSize and setLocation etc, but without calling setLayout(null) on the component you are adding the JButtons to. However this is not a best practice in Swing.
When adding to JFrame contentpane default layout is BorderLayout which adds components to is default position of BorderLayout.CENTER.
Have a read on A Visual Guide to Layout Managers
2) Also when using a correct LayoutManager you would omit JFrame#setSize(..) call and replace it with JFrame#pack() before setting the JFrame visible.
3) Also have a read on Concurrency in Swing specifically on The Event Dispatch Thread
which dictates all swing components be created on EDT via SwingUtillities.invokeXXX(..) block:
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
//create and manipulate swing components here
}
});
4) Also rather use JFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); as this will allow any other threads timers etc to carry on execution even after JFrame has been disposed.
add:
frame.getContentPane().setLayout(null);
To your code after the line:
frame.setSize(400, 500);
Components added to a container are tracked in a list. The order of the list will define the components' front-to-back stacking order within the container. If no index is specified when adding a component to a container, it will be added to the end of the list (and hence to the bottom of the stacking order).In your code the buttons are stacked over the other.That is why you get this Error(as you think it is).
This will solve your problem:-
import javax.swing.*;
import java.awt.*;
class OP3
{
public static void main (String args[])
{
JFrame frame = new JFrame("Tester Frame");
frame.setSize(400, 500);
JButton btn1 = new JButton("FOO");
btn1.setSize(150, 50);
btn1.setLocation(45, 0);
JButton btn2 = new JButton("BAR");
btn2.setSize(150, 50);
btn2.setLocation(205, 0);
JPanel p = new JPanel(new FlowLayout());
p.add(btn1);
p.add(btn2);
frame.add(p);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}//end main
}
Just add a panel to the frame and add the buttons to the panel.
import javax.swing.*;
import java.awt.*;
class source
{
public static void main (String args[])
{
JFrame frame = new JFrame("Tester Frame");
frame.setSize(400, 500);
JPanel panel=new JPanel();//panel added here
panel.setSize(frame.size());
panel.setLocation(0, 0);
JButton btn1 = new JButton("FOO");
btn1.setSize(150, 50);
btn1.setLocation(45, 0);
JButton btn2 = new JButton("BAR");
btn2.setSize(150, 50);
btn2.setLocation(205, 0);
panel.add(btn1);
panel.add(btn2);
Container content = frame.getContentPane();
content.setBackground(Color.blue);
content.add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}//endmain
I'm trying to set the the location of an image in a JFrame. I thought label.setLocation(100, 100); would set the location of the image to 100, 100 (top left corner), but it doesn't seem to do anything no matter were I put it. I even tried panal.setLocation(100, 100). Both do nothing, I get no errors and the image does appears but at 0, 0. What am I doning wrong? Here's my code:
import javax.swing.*;
public class DisplayImage {
public DisplayImage() {
JFrame frame = new JFrame("Display Image");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = (JPanel)frame.getContentPane();
JLabel label = new JLabel();
label.setIcon(new ImageIcon("src/img/school.png"));
label.setLocation(100, 100);
panel.add(label);
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
public static void main (String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DisplayImage();
}
});
}
}
By default a JFrame uses a BorderLayout. When you add your label to the frame the label is added to the CENTER of the BorderLayout. The layout manager will override the location.
One simple solution is to add an EmptyBorder to the label with the top/left insets being 100. Then instead of add the label to the center you would add the label to the NORTH. The code would be something like:
label.setBorder( new EmptyBorder(...) );
panel.add(label, BorderLayout.SOUTH);
As a general rule you should not be trying to specify exact location of a component. Let the layout managers to their jobs.
The JFrame, by default, uses a BorderLayout as it's layout manager. This will override any settings you supply to the setLocation method.
You have a number of options...
Use something like JLayeredPane, which does not, but default, have layout manager of it's own set by default. See How to use layered panes for more details
Create a custom component capable of renderering the image where you want it. Check out Performing Custom Painting for more details
Create your own layout manager that performs the operations you want...
This works for me:
import java.awt.Dimension;
import javax.swing.*;
public class DisplayImage {
public DisplayImage() {
JFrame frame = new JFrame("Display Image");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = (JPanel)frame.getContentPane();
panel.setLayout(null);
JLabel label = new JLabel();
label.setIcon(new ImageIcon("rails.png"));
panel.add(label);
Dimension size = label.getPreferredSize();
label.setBounds(100, 100, size.width, size.height);
frame.setSize(300, 200);
frame.setVisible(true);
}
public static void main (String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DisplayImage();
}
});
}
}
But you should read this:
http://docs.oracle.com/javase/tutorial/uiswing/layout/none.html