How can I make a grouping of RadioButton, of which at most one can be checked, but which allows all buttons to be unchecked? (I maintain that this has always been one of two common behaviours for groups of radio buttons.)
I haven't managed to get this to work with RadioGroup. It allows all the buttons to be unchecked on creation, but once one button is checked, there seems no way to get back to the original all-unchecked state. (Sure, in a parent's onRadioButtonClicked(), all the buttons can be unchecked -- but unfortunately by the time this is called, an unchecked button will already have been checked. So I think it would be necessary to keep a separate accounting of which buttons were previously checked, in order to use that.)
Two options have occurred to me.
One is to make my own "ReasonableRadioGroup", that allows both common behaviors. Seems a little extreme.
Another is to arrange for a long-click event on a checked button to uncheck the button -- but I don't think that would be obvious to a user.
But surely I'm just missing something!
How can I make a grouping of RadioButton, of which at most one can be checked, but which allows all buttons to be unchecked?
Sorry, there is no support for that in the RadioButton/RadioGroup classes in the Android SDK. It is possible that one of these libraries offers that, though it does not look promising.
But surely I'm just missing something!
No, sorry.
Did you try :
RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radiogroup);
radioGroup.clearCheck();
Related
I'm developing a program in java for admin orders in a restaurant.
I have a screen like this.
Frame for admin orders.
I want to select any button from left and any button from right and clic in button "Agregar" later.
I'm thinking to do a method with a lot of conditions if and else if, for example.
if(buttonCombo1.isSelected() and buttonNumber1.isSelected()){
//Doing something
}else if(buttonCombo1.isSelected() and buttonNumber2.isSelected()){
//Doing something
}
I would have to do a lot of conditions, and I have no idea do otherwise.
If you can help me to find another way for do It, I would be grateful.
Note: I apologize for my bad english. I'm learning yet.
Thanks so much.
I don't remember if you can group simple buttons. But you can define a click function in each button to change the value of button in a Bollean Array (with lenght equals amount of button.)
In this case, you will have acess a boolean value directly for a index.
I'm trying to detect ChoiceBox item selection. I read this post and I know that it is possible to do, this way:
choiceBoxObject.getSelectionModel().selectedIndexProperty().addListener(myChangeListenerObject)
also I saw this sentence in Documentation for ChoiceBox class which confirms code above:
ChoiceBox item selection is handled by SelectionModel As with ListView
and ComboBox
Another solution came to my mind and I was wondering is there anything wrong with it? why nobody mentioned this way? What is the difference between these two approaches?
choiceBoxObject.valueProperty().addListener(myChangeListenerObject);
There's nothing wrong with using the valueProperty, and in fact for simply reacting to changes in the selected value, it's probably the preferred solution.
The documentation is just indicating that there is a complete SelectionModel underlying the selection of items. This has a far richer API than simply knowing what is selected: there are selectNext(), selectFirst() methods, etc etc. So if you needed to programmatically change the selection there is a rich API available. As also pointed out in the documentation, you can even replace the selection model with a different implementation, though use cases for this are likely to be (very) rare.
i am fairly experienced at coding in java but i am just learning to build graphical user interfaces in android environment. I have searched alot for the answer to this question but i wonder if im not searching for the right thing?
I want to be able to choose between 2 radio buttons, and if the first of these radio buttons is chosen then a group of 2 more radio buttons should be chosen from. Its hard to explain exactly what i mean so i hope this helps.....
Choice One
1.a choice one a
1.b choice one b
Choice Two
So, if 'choice one' is picked then the user MUST pick from choices 1a OR 1b, whereas if the user picks 'choice two' then the sub options (1a and 1b) are not even available (greyed out i suppose).
I thought i could just nest one RadioGroup inside another, but it doesnt seem to work this way.
If anybody can help me here id be really grateful.
you could create a popup and fill the data on OnCLickListener and then display it.
Have you trying to use show() and hide() for radio button? maybe using a boolean for the parameter show() and hide()
I have a general question regarding listeners.
Lets say I have two JTabbedPanes and both have a ChangeListener. They are both displayed and I want them both to show the same pane (index) so when a user changes the selected pane in one the other changes too.
In brief, one JTabbedPane listener changes the other JTabbedPane using setSelectedTab().
Obviously, the first listener will activate the second listener and the second will reactivate the first in an endless operation.
This will be solved with booleans.
Is there a smarter way to do it?
Is there a way to change a tab without triggering the Listener?
Is there a way to activate the listener only when a user changes it and not the code?
Thank you.
BTW: I always have the same questions with buttons. But with buttons I take the code from the listener and put it in a method. when One button needs to activate a button it calls its code. But in JTabbedPane it is different.
The simple solution is to act only when necessary. For example:
if(currentTab != desiredTab) {
// change tab
}
That will prevent an infinite loop.
If you need to be able to switch the behavior on and off, then using a boolean flag isn't a bad way to go about it. The alternative is the remove the listener, using removeChangeListener. The flag may be more performant as it may avoid memory allocation and deallocation, but a lot depends on the other details of your situation.
share the selectionModel, like
secondTabbedPane.setModel(otherTabbedPane.getModel());
Sorry for the odd choice of words for the title, however, "border" seems to be the inappropriate term. While it is true that the visible line surrounding an icon in a JToggleButton can be made invisible by using setBorderPainted(false), the same is not true for JCheckBox and JRadioButton.
I can not use the JToggleButton and therefore need to use either the JCheckBox or JRadioButton (or some derivative of JToggleButton I am not aware of), but need the square or circle, respectively, to be non-visible when there is no icon on the button. Also, using setVisible(false) eliminates the button from the layout, however, I need the space to be reserved and not have the component layout change (using GroupLayout).
Any suggestions? Am I going to have to create a custom renderer? I will be looking at that in the mean time.
The route into this would be through customising the look at feel by changing some of the UI properties in the UImanager (the sort of thing that allows you to make simple tweaks with fonts and colours and presumably the images used for the checkboxes or radiobuttons) -- but it's many years since I last did that sort of thing and can't remember the details.
A little Googling turned up this project to inspect current property values, so might at least help with indicating the right part of the APIs to be looking at.
You have to choices here:
1) Customize Look and Feel as described in previous entry.
2) Create your own custom controls by inheriting from existing ones and overriding component painting.
I found a cheap and easy (read hack) for this. I created an empty transparent icon and used it when I didn't want any item to be displayed.