Controlling state of checkbox based on state of other checkboxes in android

Question

I have three checkboxes and if any two of them are selected I want to disable the third checkbox immediately. I am not getting how to proceed.

I have references to three checkboxes but I am not getting any logic to proceed forward. I atleast need logic to move forward — Nikesh Patel, Feb 05 '16 at 08:45
look at this: http://stackoverflow.com/questions/8386832/android-checkbox-listener — Pooya, Feb 05 '16 at 08:50
I think it's strange that this question got at least two upvotes. Downvote from here. As stated above, you should show what you have done so far and narrow down the problem instead of asking for a full-blown solution. Also describe what resources you have read (developer docs, tutorials etc.) in order to get an understanding of the problem at hand. We are here to help, but we are not going to do all your work for you. Show some commitment, please. — Janus Varmarken, Feb 05 '16 at 10:21
@ janus as I have stated earlier I just wanted the logic to proceed forward. And if you really want to know what I have read and what code I have written, don't worry as soon as I get the required result using the logic provided by my fellow mates I will post it here — Nikesh Patel, Feb 05 '16 at 15:25

AlbAtNf · Accepted Answer · 2016-02-05T10:07:38.627

Manage your CheckBoxes in a List, so you can iterate over them.

List<CheckBox> boxes = new ArrayList<>();

Assign them like so (in onCreate() of your activity)

 boxes.add((CheckBox) findViewById(R.id.checkbox1));
 boxes.add((CheckBox) findViewById(R.id.checkbox2));
 boxes.add((CheckBox) findViewById(R.id.checkbox3));

Add an onCheckedChangeListener like this:

for(CheckBox box : boxes){
        box.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                manageBoxes();
            }
        });
    }

and finally your manageBoxes()

private void manageBoxes(){
    int count = 0;
    for(CheckBox box : boxes){
        count += box.isChecked()?1:0;
    }

    if(count>=2){
        for(CheckBox box : boxes){
            box.setEnabled(box.isChecked());
            box.setClickable(box.isChecked()); // not sure if needed
        }
    }else{
        // reset all boxes
        for(CheckBox box : boxes){
            box.setEnabled(true);
            box.setClickable(true);
        }
    }
}

Just a quick and dirty thought. Hope this works. Plus: This is scalable, so you could include some more checkboxes if needed.

Youssef Lahoud · Answer 2 · 2016-02-05T09:08:25.347

0

Add a change handler or a click handler on each of the checkboxes and let it call a small method that is responsible for checking the value of each checkbox: if two of them are true disable the third one.

For example:

checkbox1.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            handleCheckBoxes();
        }
    });
//Do this for all the checkboxes

    private void handleCheckBoxes(){
        int checkedCount = 0;
        CheckBox uncheckedBox = null;

        if(checkBox1.isChecked()){ 
            checkedCount++; 
        }
        else{
            uncheckedBox = checkBox1;
        }

        if(checkBox2.isChecked()){
            checkedCount++; 
        }
        else{
            uncheckedBox = checkBox2;
        }

        if(checkBox3.isChecked()){
            checkedCount++; 
        }
        else{
            uncheckedBox = checkBox3;
        }

        if(checkedCount == 2){
            uncheckedBox .setEnabled(false);
        }
        else{
            //enable all checkboxes
            checkBox1.setEnables(true);
            checkBox2.setEnables(true);
            checkBox3.setEnables(true);
        }

edited Feb 05 '16 at 09:08

answered Feb 05 '16 at 08:46

Youssef Lahoud

529
3
8

do you have any demo or example for it ? – user5716019 Feb 05 '16 at 08:47
yes for example I want to calculate voltage then I need any of the two quantities from current resistance or power. So if user selects current and resistance checkboxes then the power checkbox should get disabled – Nikesh Patel Feb 05 '16 at 08:53
@NikeshPatel Please check the code in the edited post. I did not test it but you can see the logic... hope this helps – Youssef Lahoud Feb 05 '16 at 09:03
This looks pretty ugly imo. – miva2 Feb 05 '16 at 10:17
@miva2 this is not a code to deploy man. He asked for logic this is just to show the procedure. – Youssef Lahoud Feb 05 '16 at 10:20
@miva2 oh i just checked your answer, you're right! It's much cleaner that way... – Youssef Lahoud Feb 05 '16 at 10:26
@Youssef I am working on the the code provided by you. Will get to you soon – Nikesh Patel Feb 05 '16 at 15:19

score 0 · Answer 3 · answered Feb 05 '16 at 08:55

Try to implement this way :

 private ArrayList<Integer> integers = null;
     integers = new ArrayList<>();
      chkBox.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        try {
                            int position = (int) yourview.getTag();

                            if (chkBox.isChecked()) {
                                    integers.add(position);
                                    chkBox.setChecked(true);

                            } else {
                                if (integers.size() > 0) {
                             for (int i=0; i<integers.size(); i++)                                 {
                                        if (integers.get(i) == position) {
                                            integers.remove(i);
                                }
                            }
                });
    if (integers.size() > 2) {
                   //Disable your third checkbox
                }

score 0 · Answer 4 · answered Feb 05 '16 at 10:16

0

In pseudo code this would be:

Create variable to hold the number of checkboxes checked, let's call it amountChecked
When a checkbox gets checked => increment the amountChecked
When a checkbox gets checked => check if the amountChecked is equal or greater than the allowedAmountChecked (in your case this is 2)
=> if it is greater or equal to the allowedAmountChecked then disable the remaining checkboxes

answered Feb 05 '16 at 10:16

miva2

2,111
25
34

But with a counter like that, you still have to take care of display rotations. storing the counter in savedInstanceState eg. – AlbAtNf Feb 05 '16 at 10:29

Controlling state of checkbox based on state of other checkboxes in android

4 Answers4