Checking the Status of a checkbox

michaelz · #1 (**permalink**) 20-07-2010, 07:38 PM

Hello,
I have essentially a preferences window with a bunch of boolean checkboxes. In another class, I need to check the status of these checkboxes (checked or unchecked), but I don't know how to do that since I can't make another instance of the class (as the boolean values wouldn't reflect those of the preferences runner class). Any help with this would be much appreciated! thanks!

copeg · #2 (**permalink**) 20-07-2010, 07:49 PM

By checkboxes, I assume you mean JCheckBox's. To access the status, pass a reference to the client class of the class which contains the JCheckBoxes. It then has access to them...if they are private variables, make public getters of their status.

michaelz · #3 (**permalink**) 20-07-2010, 10:04 PM

Quote:

Originally Posted by copeg

By checkboxes, I assume you mean JCheckBox's. To access the status, pass a reference to the client class of the class which contains the JCheckBoxes. It then has access to them...if they are private variables, make public getters of their status.

Well they're mCheckboxes (in android) and while I have public getters, I can only use them on an instance of a class. For example (the runner class is named Checkboxes)
Checkboxes c = new Checkboxes();

c.getStatus();

but in order to use these getters , i'd have to make a new instance like i did above, which wouldn't reflect their state in the other window. How can I pass this status to other classes?

copeg · #4 (**permalink**) 20-07-2010, 10:26 PM

java Code:

public class TheOtherClass {
     private final Checkboxes checkers;
    public TheOtherClass(CheckBoxes c){
        this.checkers = c;
    }
    public void doCheck(){
        checkers.getStatus();///
    }
}

Then, when you instantiate TheOtherClass, you pass the reference to its constructor. If there are a few degrees of seperation between your CheckBoxes and TheOtherClass, you'll need to redesign you program a bit to be able to pass the reference.

Norm · #5 (**permalink**) 20-07-2010, 10:42 PM

Quote:

preferences window with a bunch of boolean checkboxes

Java Code

class prefWindow {
  // Define bunch of checkboxes
  mCheckbox cb1 = ...

  // Get the status of our cb1
  public boolean get_cb1() {
     return cb1.getStatus();
  } 
  ..

michaelz · #6 (**permalink**) 21-07-2010, 12:37 AM

Quote:

Originally Posted by Norm

Java Code

class prefWindow {
  // Define bunch of checkboxes
  mCheckbox cb1 = ...

  // Get the status of our cb1
  public boolean get_cb1() {
     return cb1.getStatus();
  } 
  ..

In prefWindow I can get the status, but to access cb1 in another class it would be impossible without making an instance of prefWindow.

Java Code

public class Checkbox extends ListActivity {
    /** Called when the activity is first created. */
	
	private CheckBoxifiedTextListAdapter cbla;
	// Create CheckBox List Adapter, cbla
	private String[] items = {"Restaurants","Pizza", "Coffee Houses", "Bakeries", "Grocers", "Caterers/Chefs","Other" };
	// Array of string we want to display in our list

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.checkbox);
        
        cbla = new CheckBoxifiedTextListAdapter(this);
        for(int k=0; k<items.length; k++)
        {
        	cbla.addItem(new CheckBoxes(items[k], false));
        }  
        // Display it
        setListAdapter(cbla);
    }

is essentially the runner class for this. I need these items that are added to cbla to be seen whether or not they are true or false. There are getter methods in the Checkboxes class, but how could these new instantiations of Checkboxes be accessed in a totally different class.

Norm · #7 (**permalink**) 21-07-2010, 12:41 AM

If the checkboxes are in prefWindow, the only way to access them is by having a reference to prefWindow. You wouldn't need to create a new instance. You would need a way to get a reference. Passing references is pretty common. What problem is there in your program?
Is prefWindow a singleton? IE there is only ever one instance at a time? Have a static getRef() method to return a reference to it.

michaelz · #8 (**permalink**) 23-07-2010, 06:06 AM

Quote:

Originally Posted by Norm

If the checkboxes are in prefWindow, the only way to access them is by having a reference to prefWindow. You wouldn't need to create a new instance. You would need a way to get a reference. Passing references is pretty common. What problem is there in your program?
Is prefWindow a singleton? IE there is only ever one instance at a time? Have a static getRef() method to return a reference to it.

Yes, there is only one instance at a time-the instance running in the onCreate() method of the Checkbox class. As you notice in the Checkbox class (i posted it above), I have a cbla. If I make this static, and then make a static getter method, can I still access the current state of each Checkboxes object, or will the values stay static?

Norm · #9 (**permalink**) 23-07-2010, 11:23 AM

You don't need to make all the variables and methods static. If you use the Singleton pattern, you only need a static varible to hold a reference to the one instance of the class and a static method to return that reference. The rest of the class would not be static.

Quote:

will the values stay static

The values will change with the user's selections as usual.

michaelz · #10 (**permalink**) 23-07-2010, 09:29 PM

so i did

Java Code

private static CheckBoxifiedTextListAdapter cbla;

and new method

Java Code

public static getCbla()
{
return cbla;
}

however, the values of cbla never seem to change when called by other classes. It sees that the name is "restaurant" and everything, but it doesn't see that it is checked.

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