how to limit checkbox selection in listview?

Question

friends,

i want to limit checkbox selection in android listivew to for example only 3 checkboxes should be selected otherwise it should give error message.

u

Answer 1

int globalInc = 0;
boolean isCheckGlobal = false;

ArrayList<Integer> checkings = new ArrayList<Integer>();

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    ViewHolder viewHolder = null;
    if (convertView == null) {
        LayoutInflater inflator = context.getLayoutInflater();
        convertView = inflator.inflate(R.layout.list_inner, null);
        viewHolder = new ViewHolder();
        viewHolder.friendName = (TextView) convertView
                .findViewById(R.id.friendName);

        viewHolder.checkbox = (CheckBox) convertView
                .findViewById(R.id.checkbox);

        final MyAdapterSecond objectMyAdapter = new MyAdapterSecond();

        viewHolder.checkbox.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                int getPositionInClick = (Integer) v.getTag();


                if (isCheckGlobal == false) {
                    if (checkings.contains(getPositionInClick)) {
                        globalInc--;
                        checkings.remove(checkings.indexOf(getPositionInClick));
                                                } else {
                        objectMyAdapter.getCheck(false);
                    }
                } else if (isCheckGlobal == true) {
                                            if (checkings.size() < 4) {
                        globalInc++;
                    }

                }
            }
        });

        viewHolder.checkbox
                .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                    @Override
                    public void onCheckedChanged(CompoundButton buttonView,
                            boolean isChecked) {
                        int getPosition = (Integer) buttonView.getTag();



                        list.get(getPosition).setSelected(
                                buttonView.isChecked());                            

                        callCheck(buttonView, "hi1");
                        if (checkings.size() > 4                            {
                            Toast.makeText(context, "Error = " + globalInc,
                                    Toast.LENGTH_LONG).show();
                                                            objectMyAdapter.setCheck(buttonView);
                            isCheckGlobal = false;


                        } else {
                            buttonView.setSelected(isChecked);
                            if (isChecked
                                    && (!checkings.contains(getPosition))) {
                                checkings.add(getPosition);
                                                                }
                            else if(!isChecked){
                                if(checkings.contains(getPosition)){
                                    checkings.remove(checkings.indexOf(getPosition));
                                }
                            }
                            isCheckGlobal = true;
                                                        }

                    }
                });
        convertView.setTag(viewHolder);
        convertView.setTag(R.id.friendName, viewHolder.friendName);

        convertView.setTag(R.id.checkbox, viewHolder.checkbox);
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }
    viewHolder.checkbox.setTag(position); // This line is important.

    viewHolder.friendName.setText(list.get(position).getname());

            viewHolder.checkbox.setChecked(list.get(position).isSelected());

    return convertView;

 }


 class MyAdapterSecond {
    CompoundButton buttonView;

    public void setCheck(CompoundButton buttonView) {
        this.buttonView = buttonView;
    }

    public void getCheck(boolean flag) {
        this.buttonView.setChecked(flag);
    }
}

Answer 2

Take a static int count variable and increment it using these condition

holder.checkBox.isChecked() if it is true then increment in the count then check count>3 then show popup to user

I hope this is Help.

Answer 3

i solved the issue "after scroll listview user can also again select more than 3 check boxex" Thanks for you patience set static int count = 0;

                     if (isChecked) {
                        count++;
                    } else if (!isChecked) {
                        count--;
                    }

                    if (count >= 4) {
                        buttonView.setChecked(false);
                        count--;
                    } else {
                        int getPosition = (Integer) buttonView.getTag();

                       contact.get(getPosition).setSelected(buttonView.isChecked());
                    } 

And Most imprtant is that add count=0 in else and viewHolder.chkContact.setTag(position) after else;

if(convertView == null){   

}else
{
 viewHolder = (ViewHolder) convertView.getTag();
 count=0;
 }
 viewHolder.chkContact.setTag(position);

`

Answer 4

finally i solved this issue :) where as globalInc is global variable with default value 0

holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() 
      {

            @Override
            public void onCheckedChanged(CompoundButton checkboxView, boolean isChecked) 
            {
                 myContacts c = (myContacts) checkboxView.getTag();

                 if(isChecked)
                 {
                     globalInc++;
                 }
                 else if(!isChecked)
                 {
                     globalInc--;
                 }
                 if(globalInc >= 4)// it will allow 3 checkboxes only
                 {
                     Toast.makeText(context, "Error = " + globalInc, Toast.LENGTH_LONG).show();
                     checkboxView.setChecked(false);
                     globalInc--;
                 }
                 else
                 {
                    c.setSelected(isChecked);
                 }
                 System.out.println(" ---------------    "+globalInc);
            }
        });

Answer 5

Try this:

public class AccountListAdapter extends BaseAdapter {

@SuppressWarnings("unused")
private final static String TAG = AccountListAdapter.class.getSimpleName();

private Context context;
private List<Account> rowItems;

private int selectedItemCounter = 0;

private final int limit;

public AccountListAdapter(Context context, List<Account> items, int limit) {
    this.context = context;
    this.rowItems = items;
    this.limit = limit;
}

public View getView(final int position, View convertView, ViewGroup parent) {

    LayoutInflater mInflater = (LayoutInflater) context
            .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

    final Account rowItem = (Account) getItem(position);

    convertView = mInflater.inflate(R.layout.account_selection_item, null);

    TextView tv = (TextView) convertView.findViewById(R.id.textView);
    ToggleButton tb = (ToggleButton) convertView
            .findViewById(R.id.toggleButton);

    tb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {

            if (isChecked && !rowItem.isSelected()) {

                if (selectedItemCounter >= limit) {
                    Toast.makeText(context,
                            "can't be more" + selectedItemCounter,
                            Toast.LENGTH_SHORT).show();
                    buttonView.setChecked(false);
                    return;
                }

                rowItem.setSelected(true);
                selectedItemCounter++;
            } else if (!isChecked && rowItem.isSelected()) {
                rowItem.setSelected(false);
                selectedItemCounter--;
            }

        }
    });

    tv.setText(rowItem.getDevId());
    tb.setChecked(rowItem.isSelected());

    return convertView;
}

@Override
public int getCount() {
    return rowItems.size();
}

@Override
public Object getItem(int position) {
    return rowItems.get(position);
}

@Override
public long getItemId(int position) {
    return rowItems.indexOf(getItem(position));
}
}

tried to improve my code with ViewHolder pattern but failed. if anyone have better idea, please let me know.