JButton background image

问题:

Hi i am trying to implement Action listener for JButton and code look like following:

ImageIcon imageForOne = new ImageIcon(getClass().getResource("resources//one.png"));
one = new JButton("",imageForOne);
one.setPreferredSize( new Dimension(78, 76));
one.addActionListener(myButtonHandler);

Using the above JButton it looks fine

When i add specific value to button for e.g.

ImageIcon imageForOne = new ImageIcon(getClass().getResource("resources//one.png"));
//Check this
one = new JButton("one",imageForOne);
one.setPreferredSize( new Dimension(78, 76));
one.addActionListener(myButtonHandler);

It look like the following image

Is there any way i can avoid this and set the value too.

Thanks for your help in advance.

回答1:

Personally, I would be using the Action API.

It will allow you defined a hierarchy of action commands (if that's what you want) as well as define self contained response to the commands.

You could...

public class OneAction extends AbstractAction {
    public OneAction() {
        ImageIcon imageForOne = new ImageIcon(getClass().getResource("resources//one.png"));
        putValue(LARGE_ICON_KEY, imageForOne);
    }

    public void actionPerfomed(ActionEvent evt) {
        // Action for button 1
    }
}

Then you would simply use with your button...

one = new JButton(new OneAction());
one.setPreferredSize( new Dimension(78, 76));

For example...

回答2:

Instead of determining the button clicked in the action listener, I would use an adapter pattern:

one.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent arg0) {
        handleClick("one");
    }        
});

where handleClick can still be the handler for all your buttons.

回答3:

i want to get that value and use it on action listener.

You use the action command for this:

one.setActionCommand("1");

However it is better to use the actual text that you want to insert into your display component. Then you can share the ActionListener on all you buttons by using code like:

ActionListener clicked = new ActionListener() 
{
    @Override
    public void actionPerformed(ActionEvent e) {
        String text = e.getActionCommand()
        // displayComponent.appendText(text);
    }        
};

one.addActionListener(clicked);
two.addActionListener(clicked);